diff --git a/Common/ConsoleListener.cpp b/Common/ConsoleListener.cpp
index 0fadc6ef2a..24ae9672b1 100644
--- a/Common/ConsoleListener.cpp
+++ b/Common/ConsoleListener.cpp
@@ -313,19 +313,19 @@ void ConsoleListener::SendToThread(LogTypes::LOG_LEVELS Level, const char *Text)
 	if (logPendingWritePos == (u32) -1)
 		return;
 
-	size_t Len = strlen(Text);
+	int Len = (int)strlen(Text);
 	if (Len > LOG_PENDING_MAX)
 		Len = LOG_PENDING_MAX - 16;
 
 	char ColorAttr[16] = "";
-	size_t ColorLen = 0;
+	int ColorLen = 0;
 	if (bUseColor)
 	{
 		// Not ANSI, since the console doesn't support it, but ANSI-like.
 		snprintf(ColorAttr, 16, "\033%d", Level);
 		// For now, rather than properly support it.
 		_dbg_assert_msg_(COMMON, strlen(ColorAttr) == 2, "Console logging doesn't support > 9 levels.");
-		ColorLen = strlen(ColorAttr);
+		ColorLen = (int)strlen(ColorAttr);
 	}
 
 	EnterCriticalSection(&criticalSection);
@@ -333,7 +333,7 @@ void ConsoleListener::SendToThread(LogTypes::LOG_LEVELS Level, const char *Text)
 	u32 prevLogWritePos = logWritePos;
 	if (logWritePos + ColorLen + Len >= LOG_PENDING_MAX)
 	{
-		for (size_t i = 0; i < ColorLen; ++i)
+		for (int i = 0; i < ColorLen; ++i)
 			logPending[(logWritePos + i) % LOG_PENDING_MAX] = ColorAttr[i];
 		logWritePos += ColorLen;
 		if (logWritePos >= LOG_PENDING_MAX)
@@ -370,7 +370,7 @@ void ConsoleListener::SendToThread(LogTypes::LOG_LEVELS Level, const char *Text)
 
 		// Okay, have it go right after the next newline.
 		if (nextNewline != NULL)
-			logPendingReadPos = nextNewline - logPending + 1;
+			logPendingReadPos = (u32)(nextNewline - logPending + 1);
 	}
 
 	// Double check we didn't start quitting.
diff --git a/Core/Debugger/Breakpoints.cpp b/Core/Debugger/Breakpoints.cpp
index cbb960f8ab..c3ae09d5d6 100644
--- a/Core/Debugger/Breakpoints.cpp
+++ b/Core/Debugger/Breakpoints.cpp
@@ -146,7 +146,7 @@ void CBreakPoints::InvalidateJit()
 
 int CBreakPoints::GetNumBreakpoints()
 {
-	return m_iBreakPoints.size();
+	return (int)m_iBreakPoints.size();
 }
 
 int CBreakPoints::GetBreakpointAddress(int i)
diff --git a/Core/Dialog/PSPOskDialog.cpp b/Core/Dialog/PSPOskDialog.cpp
index 270d095cf9..be6ed1cbeb 100644
--- a/Core/Dialog/PSPOskDialog.cpp
+++ b/Core/Dialog/PSPOskDialog.cpp
@@ -229,7 +229,7 @@ int PSPOskDialog::Update()
 		Memory::Write_U16(value, oskData.outtextPtr + (2 * i));
 	}
 
-	oskData.outtextlength = inputChars.size();
+	oskData.outtextlength = (u32)inputChars.size();
 	oskParams.base.result= 0;
 	oskData.result = PSP_UTILITY_OSK_RESULT_CHANGED;
 	Memory::WriteStruct(oskParams.SceUtilityOskDataPtr, &oskData);
diff --git a/Core/HLE/HLE.h b/Core/HLE/HLE.h
index 8ff39c328c..3b5558fbe5 100644
--- a/Core/HLE/HLE.h
+++ b/Core/HLE/HLE.h
@@ -57,7 +57,7 @@ struct Syscall
 #define RETURNF(fl) currentMIPS->f[0]=fl
 
 #ifndef ARRAY_SIZE
-#define ARRAY_SIZE(a) sizeof(a) / sizeof(a[0])
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
 #endif
 
 #include "FunctionWrappers.h"
diff --git a/Core/HLE/sceKernelInterrupt.cpp b/Core/HLE/sceKernelInterrupt.cpp
index a4791308e8..d5a0a41848 100644
--- a/Core/HLE/sceKernelInterrupt.cpp
+++ b/Core/HLE/sceKernelInterrupt.cpp
@@ -213,7 +213,7 @@ void __InterruptsInit()
 {
 	interruptsEnabled = 1;
 	inInterrupt = false;
-	for (size_t i = 0; i < ARRAY_SIZE(intrHandlers); ++i)
+	for (int i = 0; i < (int)ARRAY_SIZE(intrHandlers); ++i)
 		intrHandlers[i] = new IntrHandler(i);
 	intState.clear();
 }
diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index f6586bbe65..aa093cc09c 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -1216,7 +1216,7 @@ u32 __KernelDeleteThread(SceUID threadID, int exitStatus, const char *reason, bo
 	{
 		// TODO: Unless they should be run before deletion?
 		for (int i = 0; i < THREAD_CALLBACK_NUM_TYPES; i++)
-			readyCallbacksCount -= t->readyCallbacks[i].size();
+			readyCallbacksCount -= (int)t->readyCallbacks[i].size();
 	}
 
 	return kernelObjects.Destroy<Thread>(threadID);
diff --git a/GPU/GLES/DisplayListInterpreter.cpp b/GPU/GLES/DisplayListInterpreter.cpp
index 8fda964712..d7a6f5897e 100644
--- a/GPU/GLES/DisplayListInterpreter.cpp
+++ b/GPU/GLES/DisplayListInterpreter.cpp
@@ -965,8 +965,8 @@ void GLES_GPU::UpdateStats() {
 	gpuStats.numVertexShaders = shaderManager_->NumVertexShaders();
 	gpuStats.numFragmentShaders = shaderManager_->NumFragmentShaders();
 	gpuStats.numShaders = shaderManager_->NumPrograms();
-	gpuStats.numTextures = textureCache_.NumLoadedTextures();
-	gpuStats.numFBOs = framebufferManager_.NumVFBs();
+	gpuStats.numTextures = (int)textureCache_.NumLoadedTextures();
+	gpuStats.numFBOs = (int)framebufferManager_.NumVFBs();
 }
 
 void GLES_GPU::DoBlockTransfer() {
diff --git a/GPU/GLES/TransformPipeline.cpp b/GPU/GLES/TransformPipeline.cpp
index 5a642bcfe5..ee9687fd05 100644
--- a/GPU/GLES/TransformPipeline.cpp
+++ b/GPU/GLES/TransformPipeline.cpp
@@ -926,7 +926,7 @@ void TransformDrawEngine::Flush() {
 
 	gpuStats.numFlushes++;
 	
-	gpuStats.numTrackedVertexArrays = vai_.size();
+	gpuStats.numTrackedVertexArrays = (int)vai_.size();
 
 	// TODO: This should not be done on every drawcall, we should collect vertex data
 	// until critical state changes. That's when we draw (flush).
diff --git a/Windows/Debugger/Debugger_Disasm.cpp b/Windows/Debugger/Debugger_Disasm.cpp
index 6692978d96..7f0d044c5d 100644
--- a/Windows/Debugger/Debugger_Disasm.cpp
+++ b/Windows/Debugger/Debugger_Disasm.cpp
@@ -66,11 +66,11 @@ CDisasm::CDisasm(HINSTANCE _hInstance, HWND _hParent, DebugInterface *_cpu) : Di
 	tcItem.mask			= TCIF_TEXT;
 	tcItem.dwState		= 0;
 	tcItem.pszText		= "Regs";
-	tcItem.cchTextMax	= strlen(tcItem.pszText)+1;
+	tcItem.cchTextMax	= (int)strlen(tcItem.pszText)+1;
 	tcItem.iImage		= 0;
 	int result1 = TabCtrl_InsertItem(tabs, TabCtrl_GetItemCount(tabs),&tcItem);
 	tcItem.pszText		= "Funcs";
-	tcItem.cchTextMax	= strlen(tcItem.pszText)+1;
+	tcItem.cchTextMax	= (int)strlen(tcItem.pszText)+1;
 	int result2 = TabCtrl_InsertItem(tabs, TabCtrl_GetItemCount(tabs),&tcItem);
 	ShowWindow(GetDlgItem(m_hDlg, IDC_REGLIST), SW_NORMAL);
 	ShowWindow(GetDlgItem(m_hDlg, IDC_FUNCTIONLIST), SW_HIDE);