diff --git a/Common/GPU/Vulkan/VulkanQueueRunner.cpp b/Common/GPU/Vulkan/VulkanQueueRunner.cpp
index a44d02167a..596fd185e3 100644
--- a/Common/GPU/Vulkan/VulkanQueueRunner.cpp
+++ b/Common/GPU/Vulkan/VulkanQueueRunner.cpp
@@ -831,7 +831,7 @@ void VulkanQueueRunner::LogRenderPass(const VKRStep &pass, bool verbose) {
 
 	INFO_LOG(G3D, "RENDER %s Begin(%s, draws: %d, %dx%d, %s, %s, %s)", pass.tag, framebuf, r.numDraws, w, h, RenderPassActionName(r.color), RenderPassActionName(r.depth), RenderPassActionName(r.stencil));
 	// TODO: Log these in detail.
-	for (int i = 0; i < pass.preTransitions.size(); i++) {
+	for (int i = 0; i < (int)pass.preTransitions.size(); i++) {
 		INFO_LOG(G3D, "  PRETRANSITION: %s %s -> %s", pass.preTransitions[i].fb->tag.c_str(), AspectToString(pass.preTransitions[i].aspect), ImageLayoutToString(pass.preTransitions[i].targetLayout));
 	}
 
diff --git a/Common/Thread/ThreadManager.cpp b/Common/Thread/ThreadManager.cpp
index 43a658c2ac..5fca697635 100644
--- a/Common/Thread/ThreadManager.cpp
+++ b/Common/Thread/ThreadManager.cpp
@@ -221,7 +221,7 @@ void ThreadManager::EnqueueTask(Task *task) {
 	}
 
 	// Find a thread with no outstanding work.
-	_assert_(maxThread <= global_->threads_.size());
+	_assert_(maxThread <= (int)global_->threads_.size());
 	for (int threadNum = minThread; threadNum < maxThread; threadNum++) {
 		ThreadContext *thread = global_->threads_[threadNum];
 		if (thread->queue_size.load() == 0) {
diff --git a/Core/CoreTiming.cpp b/Core/CoreTiming.cpp
index 589bbe748c..da24649553 100644
--- a/Core/CoreTiming.cpp
+++ b/Core/CoreTiming.cpp
@@ -192,7 +192,7 @@ void RestoreRegisterEvent(int &event_type, const char *name, TimedCallback callb
 		event_type = -1;
 	if (event_type == -1)
 		event_type = nextEventTypeRestoreId++;
-	if (event_type >= event_types.size()) {
+	if (event_type >= (int)event_types.size()) {
 		// Give it any unused event id starting from the end.
 		// Older save states with messed up ids have gaps near the end.
 		for (int i = (int)event_types.size() - 1; i >= 0; --i) {
@@ -202,7 +202,7 @@ void RestoreRegisterEvent(int &event_type, const char *name, TimedCallback callb
 			}
 		}
 	}
-	_assert_msg_(event_type >= 0 && event_type < event_types.size(), "Invalid event type %d", event_type);
+	_assert_msg_(event_type >= 0 && event_type < (int)event_types.size(), "Invalid event type %d", event_type);
 	event_types[event_type] = EventType{ callback, name };
 	usedEventTypes.insert(event_type);
 	restoredEventTypes.insert(event_type);
diff --git a/Core/Dialog/PSPMsgDialog.cpp b/Core/Dialog/PSPMsgDialog.cpp
index 324a40c5e7..b681319aab 100755
--- a/Core/Dialog/PSPMsgDialog.cpp
+++ b/Core/Dialog/PSPMsgDialog.cpp
@@ -186,7 +186,7 @@ void PSPMsgDialog::DisplayMessage(std::string text, bool hasYesNo, bool hasOK) {
 
 	// Without the scrollbar, we have 390 total pixels.
 	float WRAP_WIDTH = 340.0f;
-	if (UTF8StringNonASCIICount(text.c_str()) >= text.size() / 4) {
+	if ((size_t)UTF8StringNonASCIICount(text.c_str()) >= text.size() / 4) {
 		WRAP_WIDTH = 376.0f;
 		if (text.size() > 12) {
 			messageStyle.scale = 0.6f;
diff --git a/Core/KeyMap.cpp b/Core/KeyMap.cpp
index acd8eb91b7..eb60024a8a 100644
--- a/Core/KeyMap.cpp
+++ b/Core/KeyMap.cpp
@@ -599,7 +599,7 @@ bool IsKeyMapped(int device, int key) {
 
 bool ReplaceSingleKeyMapping(int btn, int index, KeyDef key) {
 	// Check for duplicate
-	for (int i = 0; i < g_controllerMap[btn].size(); ++i) {
+	for (int i = 0; i < (int)g_controllerMap[btn].size(); ++i) {
 		if (i != index && g_controllerMap[btn][i] == key) {
 			g_controllerMap[btn].erase(g_controllerMap[btn].begin()+index);
 			g_controllerMapGeneration++;
diff --git a/GPU/Common/PresentationCommon.cpp b/GPU/Common/PresentationCommon.cpp
index b08469837b..b34f8f4df8 100644
--- a/GPU/Common/PresentationCommon.cpp
+++ b/GPU/Common/PresentationCommon.cpp
@@ -228,7 +228,7 @@ bool PresentationCommon::UpdatePostShader() {
 
 	bool usePreviousFrame = false;
 	bool usePreviousAtOutputResolution = false;
-	for (int i = 0; i < shaderInfo.size(); ++i) {
+	for (size_t i = 0; i < shaderInfo.size(); ++i) {
 		const ShaderInfo *next = i + 1 < shaderInfo.size() ? shaderInfo[i + 1] : nullptr;
 		if (!BuildPostShader(shaderInfo[i], next)) {
 			DestroyPostShader();
@@ -712,7 +712,7 @@ void PresentationCommon::CopyToOutput(OutputFlags flags, int uvRotation, float u
 				// This is the last pass and we're going direct to the backbuffer after this.
 				// Redirect output to a separate framebuffer to keep the previous frame.
 				previousIndex_++;
-				if (previousIndex_ >= previousFramebuffers_.size())
+				if (previousIndex_ >= (int)previousFramebuffers_.size())
 					previousIndex_ = 0;
 				postShaderFramebuffer = previousFramebuffers_[previousIndex_];
 			}
@@ -734,7 +734,7 @@ void PresentationCommon::CopyToOutput(OutputFlags flags, int uvRotation, float u
 
 		// Pick the next to render to.
 		previousIndex_++;
-		if (previousIndex_ >= previousFramebuffers_.size())
+		if (previousIndex_ >= (int)previousFramebuffers_.size())
 			previousIndex_ = 0;
 		Draw::Framebuffer *postShaderFramebuffer = previousFramebuffers_[previousIndex_];