diff --git a/pcsx2-qt/CMakeLists.txt b/pcsx2-qt/CMakeLists.txt
index 39134fcc3e..99951fe682 100644
--- a/pcsx2-qt/CMakeLists.txt
+++ b/pcsx2-qt/CMakeLists.txt
@@ -24,6 +24,8 @@ target_sources(pcsx2-qt PRIVATE
 	MainWindow.ui
 	PrecompiledHeader.cpp
 	PrecompiledHeader.h
+	SettingWidgetBinder.h
+	Themes.cpp
 	QtHost.cpp
 	QtHost.h
 	QtKeyCodes.cpp
@@ -31,7 +33,6 @@ target_sources(pcsx2-qt PRIVATE
 	QtProgressCallback.h
 	QtUtils.cpp
 	QtUtils.h
-	SettingWidgetBinder.h
 	GameList/EmptyGameListWidget.ui
 	GameList/GameListModel.cpp
 	GameList/GameListModel.h
diff --git a/pcsx2-qt/MainWindow.cpp b/pcsx2-qt/MainWindow.cpp
index 0a2a8e4e46..d38c553840 100644
--- a/pcsx2-qt/MainWindow.cpp
+++ b/pcsx2-qt/MainWindow.cpp
@@ -66,7 +66,6 @@
 #include "pcsx2/Frontend/Achievements.h"
 #endif
 
-
 const char* MainWindow::OPEN_FILE_FILTER =
 	QT_TRANSLATE_NOOP("MainWindow", "All File Types (*.bin *.iso *.cue *.chd *.cso *.gz *.elf *.irx *.gs *.gs.xz *.gs.zst *.dump);;"
 									"Single-Track Raw Images (*.bin *.iso);;"
@@ -87,15 +86,7 @@ const char* MainWindow::DISC_IMAGE_FILTER = QT_TRANSLATE_NOOP("MainWindow", "All
 																			"GZ Images (*.gz);;"
 																			"Block Dumps (*.dump)");
 
-#ifdef __APPLE__
-const char* MainWindow::DEFAULT_THEME_NAME = "";
-#else
-const char* MainWindow::DEFAULT_THEME_NAME = "darkfusion";
-#endif
-
 MainWindow* g_main_window = nullptr;
-static QString s_unthemed_style_name;
-static bool s_unthemed_style_name_set;
 
 #if defined(_WIN32) || defined(__APPLE__)
 static const bool s_use_central_widget = false;
@@ -502,456 +493,7 @@ void MainWindow::resetSettings(bool ui)
 	g_main_window->recreateSettings();
 }
 
-void MainWindow::updateApplicationTheme()
-{
-	if (!s_unthemed_style_name_set)
-	{
-		s_unthemed_style_name_set = true;
-		s_unthemed_style_name = QApplication::style()->objectName();
-	}
 
-	setStyleFromSettings();
-	setIconThemeFromStyle();
-}
-
-void MainWindow::setStyleFromSettings()
-{
-	const std::string theme(Host::GetBaseStringSettingValue("UI", "Theme", DEFAULT_THEME_NAME));
-
-	if (theme == "fusion")
-	{
-		// setPalette() shouldn't be necessary, as the documentation claims that setStyle() resets the palette, but it
-		// is here, to work around a bug in 6.4.x and 6.5.x where the palette doesn't restore after changing themes.
-		qApp->setPalette(QPalette());
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-		qApp->setStyleSheet(QString());
-	}
-	else if (theme == "darkfusion")
-	{
-		// adapted from https://gist.github.com/QuantumCD/6245215
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor lighterGray(75, 75, 75);
-		const QColor darkGray(53, 53, 53);
-		const QColor gray(128, 128, 128);
-		const QColor black(25, 25, 25);
-		const QColor blue(198, 238, 255);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, darkGray);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, black);
-		darkPalette.setColor(QPalette::AlternateBase, darkGray);
-		darkPalette.setColor(QPalette::ToolTipBase, darkGray);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, darkGray);
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, blue);
-		darkPalette.setColor(QPalette::Highlight, lighterGray);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-		darkPalette.setColor(QPalette::PlaceholderText, QColor(Qt::white).darker());
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, darkGray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "darkfusionblue")
-	{
-		// adapted from https://gist.github.com/QuantumCD/6245215
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor darkGray(53, 53, 53);
-		const QColor gray(128, 128, 128);
-		const QColor black(25, 25, 25);
-		const QColor blue(198, 238, 255);
-		const QColor blue2(0, 88, 208);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, darkGray);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, black);
-		darkPalette.setColor(QPalette::AlternateBase, darkGray);
-		darkPalette.setColor(QPalette::ToolTipBase, blue2);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, darkGray);
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, blue);
-		darkPalette.setColor(QPalette::Highlight, blue2);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-		darkPalette.setColor(QPalette::PlaceholderText, QColor(Qt::white).darker());
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, darkGray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "UntouchedLagoon")
-	{
-		// Custom palette by RedDevilus, Tame (Light/Washed out) Green as main color and Grayish Blue as complimentary.
-		// Alternative white theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor black(25, 25, 25);
-		const QColor darkteal(0, 77, 77);
-		const QColor teal(0, 128, 128);
-		const QColor tameTeal(160, 190, 185);
-		const QColor grayBlue(160, 180, 190);
-
-		QPalette standardPalette;
-		standardPalette.setColor(QPalette::Window, tameTeal);
-		standardPalette.setColor(QPalette::WindowText, black.lighter());
-		standardPalette.setColor(QPalette::Base, grayBlue);
-		standardPalette.setColor(QPalette::AlternateBase, tameTeal);
-		standardPalette.setColor(QPalette::ToolTipBase, tameTeal);
-		standardPalette.setColor(QPalette::ToolTipText, grayBlue);
-		standardPalette.setColor(QPalette::Text, black);
-		standardPalette.setColor(QPalette::Button, tameTeal);
-		standardPalette.setColor(QPalette::ButtonText, black);
-		standardPalette.setColor(QPalette::Link, black.lighter());
-		standardPalette.setColor(QPalette::Highlight, teal);
-		standardPalette.setColor(QPalette::HighlightedText, grayBlue.lighter());
-
-		standardPalette.setColor(QPalette::Active, QPalette::Button, tameTeal);
-		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkteal);
-		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkteal.lighter());
-		standardPalette.setColor(QPalette::Disabled, QPalette::Text, darkteal.lighter());
-		standardPalette.setColor(QPalette::Disabled, QPalette::Light, tameTeal);
-
-		qApp->setPalette(standardPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "BabyPastel")
-	{
-		// Custom palette by RedDevilus, Blue as main color and blue as complimentary.
-		// Alternative light theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor gray(150, 150, 150);
-		const QColor black(25, 25, 25);
-		const QColor redpinkish(200, 75, 132);
-		const QColor pink(255, 174, 201);
-		const QColor brightPink(255, 230, 255);
-		const QColor congoPink(255, 127, 121);
-		const QColor blue(221, 225, 239);
-
-		QPalette standardPalette;
-		standardPalette.setColor(QPalette::Window, pink);
-		standardPalette.setColor(QPalette::WindowText, black);
-		standardPalette.setColor(QPalette::Base, brightPink);
-		standardPalette.setColor(QPalette::AlternateBase, blue);
-		standardPalette.setColor(QPalette::ToolTipBase, pink);
-		standardPalette.setColor(QPalette::ToolTipText, brightPink);
-		standardPalette.setColor(QPalette::Text, black);
-		standardPalette.setColor(QPalette::Button, pink);
-		standardPalette.setColor(QPalette::ButtonText, black);
-		standardPalette.setColor(QPalette::Link, black);
-		standardPalette.setColor(QPalette::Highlight, congoPink);
-		standardPalette.setColor(QPalette::HighlightedText, black);
-
-		standardPalette.setColor(QPalette::Active, QPalette::Button, pink);
-		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, redpinkish);
-		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, redpinkish);
-		standardPalette.setColor(QPalette::Disabled, QPalette::Text, redpinkish);
-		standardPalette.setColor(QPalette::Disabled, QPalette::Light, gray);
-
-		qApp->setPalette(standardPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "PizzaBrown")
-	{
-		// Custom palette by KamFretoZ, a Pizza Tower Reference!
-		// With a mixtures of Light Brown, Peachy/Creamy White, Latte-like Color.
-		// Thanks to Jordan for the idea :P
-		// Alternative light theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor gray(128, 128, 128);
-		const QColor extr(248, 192, 88);
-		const QColor main(233, 187, 147);
-		const QColor comp(248, 230, 213);
-		const QColor highlight(188, 100, 60);
-
-		QPalette standardPalette;
-		standardPalette.setColor(QPalette::Window, main);
-		standardPalette.setColor(QPalette::WindowText, Qt::black);
-		standardPalette.setColor(QPalette::Base, comp);
-		standardPalette.setColor(QPalette::AlternateBase, extr);
-		standardPalette.setColor(QPalette::ToolTipBase, comp);
-		standardPalette.setColor(QPalette::ToolTipText, Qt::black);
-		standardPalette.setColor(QPalette::Text, Qt::black);
-		standardPalette.setColor(QPalette::Button, extr);
-		standardPalette.setColor(QPalette::ButtonText, Qt::black);
-		standardPalette.setColor(QPalette::Link, Qt::black);
-		standardPalette.setColor(QPalette::Highlight, highlight);
-		standardPalette.setColor(QPalette::HighlightedText, Qt::white);
-		standardPalette.setColor(QPalette::Active, QPalette::Button, extr);
-		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray.darker());
-		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray.darker());
-		standardPalette.setColor(QPalette::Disabled, QPalette::Text, Qt::gray);
-		standardPalette.setColor(QPalette::Disabled, QPalette::Light, gray.lighter());
-
-		qApp->setPalette(standardPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #cc3f18; border: 1px solid white; }");
-	}
-	else if (theme == "PCSX2Blue")
-	{
-		// Custom palette by RedDevilus, White as main color and Blue as complimentary.
-		// Alternative light theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor blackish(35, 35, 35);
-		const QColor darkBlue(73, 97, 177);
-		const QColor blue2(80, 120, 200);
-		const QColor blue(106, 156, 255);
-		const QColor lightBlue(130, 155, 241);
-
-		QPalette standardPalette;
-		standardPalette.setColor(QPalette::Window, blue2.lighter());
-		standardPalette.setColor(QPalette::WindowText, blackish);
-		standardPalette.setColor(QPalette::Base, lightBlue);
-		standardPalette.setColor(QPalette::AlternateBase, blue2.lighter());
-		standardPalette.setColor(QPalette::ToolTipBase, blue2);
-		standardPalette.setColor(QPalette::ToolTipText, Qt::white);
-		standardPalette.setColor(QPalette::Text, blackish);
-		standardPalette.setColor(QPalette::Button, blue);
-		standardPalette.setColor(QPalette::ButtonText, blackish);
-		standardPalette.setColor(QPalette::Link, darkBlue);
-		standardPalette.setColor(QPalette::Highlight, Qt::white);
-		standardPalette.setColor(QPalette::HighlightedText, blackish);
-
-		standardPalette.setColor(QPalette::Active, QPalette::Button, blue);
-		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkBlue);
-		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkBlue);
-		standardPalette.setColor(QPalette::Disabled, QPalette::Text, darkBlue);
-		standardPalette.setColor(QPalette::Disabled, QPalette::Light, darkBlue);
-
-		qApp->setPalette(standardPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "ScarletDevilRed")
-	{
-		// Custom palette by RedDevilus, Red as main color and Purple as complimentary.
-		// Alternative dark theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor darkRed(80, 45, 69);
-		const QColor purplishRed(120, 45, 69);
-		const QColor brightRed(200, 45, 69);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, darkRed);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, purplishRed);
-		darkPalette.setColor(QPalette::AlternateBase, darkRed);
-		darkPalette.setColor(QPalette::ToolTipBase, darkRed);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, purplishRed.darker());
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, brightRed);
-		darkPalette.setColor(QPalette::Highlight, brightRed);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, purplishRed.darker());
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, brightRed);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, brightRed);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, brightRed);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkRed);
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "CobaltSky")
-	{
-		// Custom palette by KamFretoZ, A soothing deep royal blue 
-		// that are meant to be easy on the eyes as the main color.
-		// Alternative dark theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor gray(150, 150, 150);
-		const QColor royalBlue(29, 41, 81);
-		const QColor darkishBlue(17, 30, 108);
-		const QColor highlight(36, 93, 218);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, royalBlue);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, royalBlue.lighter());
-		darkPalette.setColor(QPalette::AlternateBase, darkishBlue);
-		darkPalette.setColor(QPalette::ToolTipBase, darkishBlue);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, darkishBlue);
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, Qt::white);
-		darkPalette.setColor(QPalette::Highlight, highlight);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, darkishBlue);
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, gray);
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "VioletAngelPurple")
-	{
-		// Custom palette by RedDevilus, Blue as main color and Purple as complimentary.
-		// Alternative dark theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor blackishblue(50, 25, 70);
-		const QColor darkerPurple(90, 30, 105);
-		const QColor nauticalPurple(110, 30, 125);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, blackishblue);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, nauticalPurple);
-		darkPalette.setColor(QPalette::AlternateBase, blackishblue);
-		darkPalette.setColor(QPalette::ToolTipBase, nauticalPurple);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, nauticalPurple.darker());
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, darkerPurple.lighter());
-		darkPalette.setColor(QPalette::Highlight, darkerPurple.lighter());
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, nauticalPurple.darker());
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkerPurple.lighter());
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkerPurple.lighter());
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, darkerPurple.darker());
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, nauticalPurple);
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "Ruby")
-	{
-		// Custom palette by Daisouji, Black as main color and Red as complimentary.
-		// Alternative dark (black) theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor gray(128, 128, 128);
-		const QColor slate(18, 18, 18);
-		const QColor rubyish(172, 21, 31);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, slate);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, slate.lighter());
-		darkPalette.setColor(QPalette::AlternateBase, slate.lighter());
-		darkPalette.setColor(QPalette::ToolTipBase, slate);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, slate);
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, Qt::white);
-		darkPalette.setColor(QPalette::Highlight, rubyish);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, slate);
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, slate.lighter());
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "Sapphire")
-	{
-		// Custom palette by RedDevilus, Black as main color and Blue as complimentary.
-		// Alternative dark (black) theme.
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		const QColor gray(128, 128, 128);
-		const QColor slate(18, 18, 18);
-		const QColor persianBlue(32, 35, 204);
-
-		QPalette darkPalette;
-		darkPalette.setColor(QPalette::Window, slate);
-		darkPalette.setColor(QPalette::WindowText, Qt::white);
-		darkPalette.setColor(QPalette::Base, slate.lighter());
-		darkPalette.setColor(QPalette::AlternateBase, slate.lighter());
-		darkPalette.setColor(QPalette::ToolTipBase, slate);
-		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-		darkPalette.setColor(QPalette::Text, Qt::white);
-		darkPalette.setColor(QPalette::Button, slate);
-		darkPalette.setColor(QPalette::ButtonText, Qt::white);
-		darkPalette.setColor(QPalette::Link, Qt::white);
-		darkPalette.setColor(QPalette::Highlight, persianBlue);
-		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
-
-		darkPalette.setColor(QPalette::Active, QPalette::Button, slate);
-		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
-		darkPalette.setColor(QPalette::Disabled, QPalette::Light, slate.lighter());
-
-		qApp->setPalette(darkPalette);
-
-		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
-	}
-	else if (theme == "Custom")
-	{
-
-		//Additional Theme option than loads .qss from main PCSX2 Directory
-		qApp->setStyle(QStyleFactory::create("Fusion"));
-
-		QString sheet_content;
-		QFile sheets(QString::fromStdString(Path::Combine(EmuFolders::DataRoot, "custom.qss")));
-
-		if (sheets.open(QFile::ReadOnly))
-		{
-			QString sheet_content = QString::fromUtf8(sheets.readAll().data());
-			qApp->setStyleSheet(sheet_content);
-		}
-		else
-		{
-			qApp->setStyle(QStyleFactory::create("Fusion"));
-		}
-	}
-	else
-	{
-		// setPalette() shouldn't be necessary, as the documentation claims that setStyle() resets the palette, but it
-		// is here, to work around a bug in 6.4.x and 6.5.x where the palette doesn't restore after changing themes.
-		qApp->setPalette(QPalette());
-		qApp->setStyle(s_unthemed_style_name);
-		qApp->setStyleSheet(QString());
-	}
-}
-
-void MainWindow::setIconThemeFromStyle()
-{
-	QPalette palette = qApp->palette();
-	bool dark = palette.windowText().color().value() > palette.window().color().value();
-	QIcon::setThemeName(dark ? QStringLiteral("white") : QStringLiteral("black"));
-}
 
 void MainWindow::onScreenshotActionTriggered()
 {
@@ -1576,7 +1118,11 @@ void MainWindow::onGameListEntryContextMenuRequested(const QPoint& point)
 			if (m_ui.menuDebug->menuAction()->isVisible())
 			{
 				action = menu.addAction(tr("Boot and Debug"));
-				connect(action, &QAction::triggered, [this, entry]() { DebugInterface::setPauseOnEntry(true); startGameListEntry(entry); getDebuggerWindow()->show(); });
+				connect(action, &QAction::triggered, [this, entry]() {
+					DebugInterface::setPauseOnEntry(true);
+					startGameListEntry(entry);
+					getDebuggerWindow()->show();
+				});
 			}
 
 			menu.addSeparator();
@@ -1840,7 +1386,7 @@ void MainWindow::onToolsCoverDownloaderTriggered()
 
 void MainWindow::updateTheme()
 {
-	updateApplicationTheme();
+	QtHost::UpdateApplicationTheme();
 	m_game_list_widget->refreshImages();
 }
 
diff --git a/pcsx2-qt/MainWindow.h b/pcsx2-qt/MainWindow.h
index 64b648debc..a1ad4a2b6c 100644
--- a/pcsx2-qt/MainWindow.h
+++ b/pcsx2-qt/MainWindow.h
@@ -77,9 +77,6 @@ public:
 		bool m_was_fullscreen;
 	};
 
-	/// Default theme name for the platform.
-	static const char* DEFAULT_THEME_NAME;
-
 	/// Default filter for opening a file.
 	static const char* OPEN_FILE_FILTER;
 
@@ -90,9 +87,6 @@ public:
 	MainWindow();
 	~MainWindow();
 
-	/// Sets application theme according to settings.
-	static void updateApplicationTheme();
-
 	void initialize();
 	void connectVMThreadSignals(EmuThread* thread);
 	void startupUpdateCheck();
diff --git a/pcsx2-qt/QtHost.cpp b/pcsx2-qt/QtHost.cpp
index 690307aac8..d6f258493a 100644
--- a/pcsx2-qt/QtHost.cpp
+++ b/pcsx2-qt/QtHost.cpp
@@ -1250,7 +1250,7 @@ void Host::SetDefaultUISettings(SettingsInterface& si)
 	si.SetBoolValue("UI", "RenderToSeparateWindow", false);
 	si.SetBoolValue("UI", "HideMainWindowWhenRunning", false);
 	si.SetBoolValue("UI", "DisableWindowResize", false);
-	si.SetStringValue("UI", "Theme", MainWindow::DEFAULT_THEME_NAME);
+	si.SetStringValue("UI", "Theme", QtHost::GetDefaultThemeName());
 }
 
 void QtHost::SaveSettings()
@@ -1797,7 +1797,7 @@ int main(int argc, char* argv[])
 		return EXIT_SUCCESS;
 
 	// Set theme before creating any windows.
-	MainWindow::updateApplicationTheme();
+	QtHost::UpdateApplicationTheme();
 	MainWindow* main_window = new MainWindow();
 
 	// Start up the CPU thread.
diff --git a/pcsx2-qt/QtHost.h b/pcsx2-qt/QtHost.h
index 7870d80299..a63723726c 100644
--- a/pcsx2-qt/QtHost.h
+++ b/pcsx2-qt/QtHost.h
@@ -213,6 +213,12 @@ extern EmuThread* g_emu_thread;
 
 namespace QtHost
 {
+	/// Default theme name for the platform.
+	const char* GetDefaultThemeName();
+
+	/// Sets application theme according to settings.
+	void UpdateApplicationTheme();
+
 	/// Sets batch mode (exit after game shutdown).
 	bool InBatchMode();
 
diff --git a/pcsx2-qt/Settings/InterfaceSettingsWidget.cpp b/pcsx2-qt/Settings/InterfaceSettingsWidget.cpp
index b4e5213241..bceae748bc 100644
--- a/pcsx2-qt/Settings/InterfaceSettingsWidget.cpp
+++ b/pcsx2-qt/Settings/InterfaceSettingsWidget.cpp
@@ -20,6 +20,7 @@
 #include "MainWindow.h"
 #include "SettingWidgetBinder.h"
 #include "SettingsDialog.h"
+#include "QtHost.h"
 
 static const char* THEME_NAMES[] = {
 	QT_TRANSLATE_NOOP("InterfaceSettingsWidget", "Native"),
@@ -91,7 +92,7 @@ InterfaceSettingsWidget::InterfaceSettingsWidget(SettingsDialog* dialog, QWidget
 	connect(m_ui.renderToSeparateWindow, &QCheckBox::stateChanged, this, &InterfaceSettingsWidget::onRenderToSeparateWindowChanged);
 
 	SettingWidgetBinder::BindWidgetToEnumSetting(sif, m_ui.theme, "UI", "Theme", THEME_NAMES, THEME_VALUES,
-		MainWindow::DEFAULT_THEME_NAME);
+		QtHost::GetDefaultThemeName());
 	connect(m_ui.theme, QOverload<int>::of(&QComboBox::currentIndexChanged), [this]() { emit themeChanged(); });
 
 	// Per-game settings is special, we don't want to bind it if we're editing per-game settings.
diff --git a/pcsx2-qt/Themes.cpp b/pcsx2-qt/Themes.cpp
new file mode 100644
index 0000000000..d931dfebb4
--- /dev/null
+++ b/pcsx2-qt/Themes.cpp
@@ -0,0 +1,495 @@
+/*  PCSX2 - PS2 Emulator for PCs
+ *  Copyright (C) 2002-2023  PCSX2 Dev Team
+ *
+ *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU Lesser General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with PCSX2.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "PrecompiledHeader.h"
+#include "QtHost.h"
+
+#include "pcsx2/Config.h"
+#include "pcsx2/HostSettings.h"
+
+#include "common/Path.h"
+
+#include <QtGui/QPalette>
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QStyle>
+#include <QtWidgets/QStyleFactory>
+
+namespace QtHost
+{
+	static void SetStyleFromSettings();
+	static void SetIconThemeFromStyle();
+} // namespace QtHost
+
+static QString s_unthemed_style_name;
+static bool s_unthemed_style_name_set;
+
+const char* QtHost::GetDefaultThemeName()
+{
+#ifdef __APPLE__
+	return "";
+#else
+	return "darkfusion";
+#endif
+}
+
+void QtHost::UpdateApplicationTheme()
+{
+	if (!s_unthemed_style_name_set)
+	{
+		s_unthemed_style_name_set = true;
+		s_unthemed_style_name = QApplication::style()->objectName();
+	}
+
+	SetStyleFromSettings();
+	SetIconThemeFromStyle();
+}
+
+void QtHost::SetStyleFromSettings()
+{
+	const std::string theme(Host::GetBaseStringSettingValue("UI", "Theme", GetDefaultThemeName()));
+
+	if (theme == "fusion")
+	{
+		// setPalette() shouldn't be necessary, as the documentation claims that setStyle() resets the palette, but it
+		// is here, to work around a bug in 6.4.x and 6.5.x where the palette doesn't restore after changing themes.
+		qApp->setPalette(QPalette());
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+		qApp->setStyleSheet(QString());
+	}
+	else if (theme == "darkfusion")
+	{
+		// adapted from https://gist.github.com/QuantumCD/6245215
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor lighterGray(75, 75, 75);
+		const QColor darkGray(53, 53, 53);
+		const QColor gray(128, 128, 128);
+		const QColor black(25, 25, 25);
+		const QColor blue(198, 238, 255);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, darkGray);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, black);
+		darkPalette.setColor(QPalette::AlternateBase, darkGray);
+		darkPalette.setColor(QPalette::ToolTipBase, darkGray);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, darkGray);
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, blue);
+		darkPalette.setColor(QPalette::Highlight, lighterGray);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+		darkPalette.setColor(QPalette::PlaceholderText, QColor(Qt::white).darker());
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, darkGray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "darkfusionblue")
+	{
+		// adapted from https://gist.github.com/QuantumCD/6245215
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor darkGray(53, 53, 53);
+		const QColor gray(128, 128, 128);
+		const QColor black(25, 25, 25);
+		const QColor blue(198, 238, 255);
+		const QColor blue2(0, 88, 208);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, darkGray);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, black);
+		darkPalette.setColor(QPalette::AlternateBase, darkGray);
+		darkPalette.setColor(QPalette::ToolTipBase, blue2);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, darkGray);
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, blue);
+		darkPalette.setColor(QPalette::Highlight, blue2);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+		darkPalette.setColor(QPalette::PlaceholderText, QColor(Qt::white).darker());
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, darkGray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkGray);
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "UntouchedLagoon")
+	{
+		// Custom palette by RedDevilus, Tame (Light/Washed out) Green as main color and Grayish Blue as complimentary.
+		// Alternative white theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor black(25, 25, 25);
+		const QColor darkteal(0, 77, 77);
+		const QColor teal(0, 128, 128);
+		const QColor tameTeal(160, 190, 185);
+		const QColor grayBlue(160, 180, 190);
+
+		QPalette standardPalette;
+		standardPalette.setColor(QPalette::Window, tameTeal);
+		standardPalette.setColor(QPalette::WindowText, black.lighter());
+		standardPalette.setColor(QPalette::Base, grayBlue);
+		standardPalette.setColor(QPalette::AlternateBase, tameTeal);
+		standardPalette.setColor(QPalette::ToolTipBase, tameTeal);
+		standardPalette.setColor(QPalette::ToolTipText, grayBlue);
+		standardPalette.setColor(QPalette::Text, black);
+		standardPalette.setColor(QPalette::Button, tameTeal);
+		standardPalette.setColor(QPalette::ButtonText, black);
+		standardPalette.setColor(QPalette::Link, black.lighter());
+		standardPalette.setColor(QPalette::Highlight, teal);
+		standardPalette.setColor(QPalette::HighlightedText, grayBlue.lighter());
+
+		standardPalette.setColor(QPalette::Active, QPalette::Button, tameTeal);
+		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkteal);
+		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkteal.lighter());
+		standardPalette.setColor(QPalette::Disabled, QPalette::Text, darkteal.lighter());
+		standardPalette.setColor(QPalette::Disabled, QPalette::Light, tameTeal);
+
+		qApp->setPalette(standardPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "BabyPastel")
+	{
+		// Custom palette by RedDevilus, Blue as main color and blue as complimentary.
+		// Alternative light theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor gray(150, 150, 150);
+		const QColor black(25, 25, 25);
+		const QColor redpinkish(200, 75, 132);
+		const QColor pink(255, 174, 201);
+		const QColor brightPink(255, 230, 255);
+		const QColor congoPink(255, 127, 121);
+		const QColor blue(221, 225, 239);
+
+		QPalette standardPalette;
+		standardPalette.setColor(QPalette::Window, pink);
+		standardPalette.setColor(QPalette::WindowText, black);
+		standardPalette.setColor(QPalette::Base, brightPink);
+		standardPalette.setColor(QPalette::AlternateBase, blue);
+		standardPalette.setColor(QPalette::ToolTipBase, pink);
+		standardPalette.setColor(QPalette::ToolTipText, brightPink);
+		standardPalette.setColor(QPalette::Text, black);
+		standardPalette.setColor(QPalette::Button, pink);
+		standardPalette.setColor(QPalette::ButtonText, black);
+		standardPalette.setColor(QPalette::Link, black);
+		standardPalette.setColor(QPalette::Highlight, congoPink);
+		standardPalette.setColor(QPalette::HighlightedText, black);
+
+		standardPalette.setColor(QPalette::Active, QPalette::Button, pink);
+		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, redpinkish);
+		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, redpinkish);
+		standardPalette.setColor(QPalette::Disabled, QPalette::Text, redpinkish);
+		standardPalette.setColor(QPalette::Disabled, QPalette::Light, gray);
+
+		qApp->setPalette(standardPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "PizzaBrown")
+	{
+		// Custom palette by KamFretoZ, a Pizza Tower Reference!
+		// With a mixtures of Light Brown, Peachy/Creamy White, Latte-like Color.
+		// Thanks to Jordan for the idea :P
+		// Alternative light theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor gray(128, 128, 128);
+		const QColor extr(248, 192, 88);
+		const QColor main(233, 187, 147);
+		const QColor comp(248, 230, 213);
+		const QColor highlight(188, 100, 60);
+
+		QPalette standardPalette;
+		standardPalette.setColor(QPalette::Window, main);
+		standardPalette.setColor(QPalette::WindowText, Qt::black);
+		standardPalette.setColor(QPalette::Base, comp);
+		standardPalette.setColor(QPalette::AlternateBase, extr);
+		standardPalette.setColor(QPalette::ToolTipBase, comp);
+		standardPalette.setColor(QPalette::ToolTipText, Qt::black);
+		standardPalette.setColor(QPalette::Text, Qt::black);
+		standardPalette.setColor(QPalette::Button, extr);
+		standardPalette.setColor(QPalette::ButtonText, Qt::black);
+		standardPalette.setColor(QPalette::Link, Qt::black);
+		standardPalette.setColor(QPalette::Highlight, highlight);
+		standardPalette.setColor(QPalette::HighlightedText, Qt::white);
+		standardPalette.setColor(QPalette::Active, QPalette::Button, extr);
+		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray.darker());
+		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray.darker());
+		standardPalette.setColor(QPalette::Disabled, QPalette::Text, Qt::gray);
+		standardPalette.setColor(QPalette::Disabled, QPalette::Light, gray.lighter());
+
+		qApp->setPalette(standardPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #cc3f18; border: 1px solid white; }");
+	}
+	else if (theme == "PCSX2Blue")
+	{
+		// Custom palette by RedDevilus, White as main color and Blue as complimentary.
+		// Alternative light theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor blackish(35, 35, 35);
+		const QColor darkBlue(73, 97, 177);
+		const QColor blue2(80, 120, 200);
+		const QColor blue(106, 156, 255);
+		const QColor lightBlue(130, 155, 241);
+
+		QPalette standardPalette;
+		standardPalette.setColor(QPalette::Window, blue2.lighter());
+		standardPalette.setColor(QPalette::WindowText, blackish);
+		standardPalette.setColor(QPalette::Base, lightBlue);
+		standardPalette.setColor(QPalette::AlternateBase, blue2.lighter());
+		standardPalette.setColor(QPalette::ToolTipBase, blue2);
+		standardPalette.setColor(QPalette::ToolTipText, Qt::white);
+		standardPalette.setColor(QPalette::Text, blackish);
+		standardPalette.setColor(QPalette::Button, blue);
+		standardPalette.setColor(QPalette::ButtonText, blackish);
+		standardPalette.setColor(QPalette::Link, darkBlue);
+		standardPalette.setColor(QPalette::Highlight, Qt::white);
+		standardPalette.setColor(QPalette::HighlightedText, blackish);
+
+		standardPalette.setColor(QPalette::Active, QPalette::Button, blue);
+		standardPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkBlue);
+		standardPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkBlue);
+		standardPalette.setColor(QPalette::Disabled, QPalette::Text, darkBlue);
+		standardPalette.setColor(QPalette::Disabled, QPalette::Light, darkBlue);
+
+		qApp->setPalette(standardPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "ScarletDevilRed")
+	{
+		// Custom palette by RedDevilus, Red as main color and Purple as complimentary.
+		// Alternative dark theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor darkRed(80, 45, 69);
+		const QColor purplishRed(120, 45, 69);
+		const QColor brightRed(200, 45, 69);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, darkRed);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, purplishRed);
+		darkPalette.setColor(QPalette::AlternateBase, darkRed);
+		darkPalette.setColor(QPalette::ToolTipBase, darkRed);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, purplishRed.darker());
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, brightRed);
+		darkPalette.setColor(QPalette::Highlight, brightRed);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, purplishRed.darker());
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, brightRed);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, brightRed);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, brightRed);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, darkRed);
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "CobaltSky")
+	{
+		// Custom palette by KamFretoZ, A soothing deep royal blue
+		// that are meant to be easy on the eyes as the main color.
+		// Alternative dark theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor gray(150, 150, 150);
+		const QColor royalBlue(29, 41, 81);
+		const QColor darkishBlue(17, 30, 108);
+		const QColor highlight(36, 93, 218);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, royalBlue);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, royalBlue.lighter());
+		darkPalette.setColor(QPalette::AlternateBase, darkishBlue);
+		darkPalette.setColor(QPalette::ToolTipBase, darkishBlue);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, darkishBlue);
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, Qt::white);
+		darkPalette.setColor(QPalette::Highlight, highlight);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, darkishBlue);
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, gray);
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "VioletAngelPurple")
+	{
+		// Custom palette by RedDevilus, Blue as main color and Purple as complimentary.
+		// Alternative dark theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor blackishblue(50, 25, 70);
+		const QColor darkerPurple(90, 30, 105);
+		const QColor nauticalPurple(110, 30, 125);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, blackishblue);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, nauticalPurple);
+		darkPalette.setColor(QPalette::AlternateBase, blackishblue);
+		darkPalette.setColor(QPalette::ToolTipBase, nauticalPurple);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, nauticalPurple.darker());
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, darkerPurple.lighter());
+		darkPalette.setColor(QPalette::Highlight, darkerPurple.lighter());
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, nauticalPurple.darker());
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, darkerPurple.lighter());
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, darkerPurple.lighter());
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, darkerPurple.darker());
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, nauticalPurple);
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "Ruby")
+	{
+		// Custom palette by Daisouji, Black as main color and Red as complimentary.
+		// Alternative dark (black) theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor gray(128, 128, 128);
+		const QColor slate(18, 18, 18);
+		const QColor rubyish(172, 21, 31);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, slate);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, slate.lighter());
+		darkPalette.setColor(QPalette::AlternateBase, slate.lighter());
+		darkPalette.setColor(QPalette::ToolTipBase, slate);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, slate);
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, Qt::white);
+		darkPalette.setColor(QPalette::Highlight, rubyish);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, slate);
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, slate.lighter());
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "Sapphire")
+	{
+		// Custom palette by RedDevilus, Black as main color and Blue as complimentary.
+		// Alternative dark (black) theme.
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		const QColor gray(128, 128, 128);
+		const QColor slate(18, 18, 18);
+		const QColor persianBlue(32, 35, 204);
+
+		QPalette darkPalette;
+		darkPalette.setColor(QPalette::Window, slate);
+		darkPalette.setColor(QPalette::WindowText, Qt::white);
+		darkPalette.setColor(QPalette::Base, slate.lighter());
+		darkPalette.setColor(QPalette::AlternateBase, slate.lighter());
+		darkPalette.setColor(QPalette::ToolTipBase, slate);
+		darkPalette.setColor(QPalette::ToolTipText, Qt::white);
+		darkPalette.setColor(QPalette::Text, Qt::white);
+		darkPalette.setColor(QPalette::Button, slate);
+		darkPalette.setColor(QPalette::ButtonText, Qt::white);
+		darkPalette.setColor(QPalette::Link, Qt::white);
+		darkPalette.setColor(QPalette::Highlight, persianBlue);
+		darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+
+		darkPalette.setColor(QPalette::Active, QPalette::Button, slate);
+		darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::WindowText, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Text, gray);
+		darkPalette.setColor(QPalette::Disabled, QPalette::Light, slate.lighter());
+
+		qApp->setPalette(darkPalette);
+
+		qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
+	}
+	else if (theme == "Custom")
+	{
+		//Additional Theme option than loads .qss from main PCSX2 Directory
+		qApp->setStyle(QStyleFactory::create("Fusion"));
+
+		QString sheet_content;
+		QFile sheets(QString::fromStdString(Path::Combine(EmuFolders::DataRoot, "custom.qss")));
+
+		if (sheets.open(QFile::ReadOnly))
+		{
+			QString sheet_content = QString::fromUtf8(sheets.readAll().data());
+			qApp->setStyleSheet(sheet_content);
+		}
+		else
+		{
+			qApp->setStyle(QStyleFactory::create("Fusion"));
+		}
+	}
+	else
+	{
+		// setPalette() shouldn't be necessary, as the documentation claims that setStyle() resets the palette, but it
+		// is here, to work around a bug in 6.4.x and 6.5.x where the palette doesn't restore after changing themes.
+		qApp->setPalette(QPalette());
+		qApp->setStyle(s_unthemed_style_name);
+		qApp->setStyleSheet(QString());
+	}
+}
+
+void QtHost::SetIconThemeFromStyle()
+{
+	QPalette palette = qApp->palette();
+	bool dark = palette.windowText().color().value() > palette.window().color().value();
+	QIcon::setThemeName(dark ? QStringLiteral("white") : QStringLiteral("black"));
+}
diff --git a/pcsx2-qt/pcsx2-qt.vcxproj b/pcsx2-qt/pcsx2-qt.vcxproj
index 8f11b81e78..42ac55cb57 100644
--- a/pcsx2-qt/pcsx2-qt.vcxproj
+++ b/pcsx2-qt/pcsx2-qt.vcxproj
@@ -144,6 +144,7 @@
     <ClCompile Include="Settings\DebugSettingsWidget.cpp" />
     <ClCompile Include="Settings\FolderSettingsWidget.cpp" />
     <ClCompile Include="Settings\MemoryCardConvertWorker.cpp" />
+    <ClCompile Include="Themes.cpp" />
     <ClCompile Include="Tools\InputRecording\InputRecordingViewer.cpp" />
     <ClCompile Include="Tools\InputRecording\NewInputRecordingDlg.cpp" />
     <ClCompile Include="Debugger\CpuWidget.cpp" />
diff --git a/pcsx2-qt/pcsx2-qt.vcxproj.filters b/pcsx2-qt/pcsx2-qt.vcxproj.filters
index 0049d2e818..910d93c32e 100644
--- a/pcsx2-qt/pcsx2-qt.vcxproj.filters
+++ b/pcsx2-qt/pcsx2-qt.vcxproj.filters
@@ -315,6 +315,7 @@
     <ClCompile Include="$(IntDir)moc_ColorPickerButton.cpp">
       <Filter>moc</Filter>
     </ClCompile>
+    <ClCompile Include="Themes.cpp" />
   </ItemGroup>
   <ItemGroup>
     <Manifest Include="..\pcsx2\windows\PCSX2.manifest">