diff --git a/Source/Core/Common/IniFile.h b/Source/Core/Common/IniFile.h
index 29a6ddba8cae..3847eeb9e582 100644
--- a/Source/Core/Common/IniFile.h
+++ b/Source/Core/Common/IniFile.h
@@ -140,8 +140,6 @@ class IniFile
 
 	const Section* GetSection(const std::string& section) const;
 	Section* GetSection(const std::string& section);
-	std::string* GetLine(const std::string& section, const std::string& key);
-	void CreateSection(const std::string& section);
 
 	static const std::string& NULL_STRING;
 };
diff --git a/Source/Core/Core/DSP/DSPEmitter.h b/Source/Core/Core/DSP/DSPEmitter.h
index a6738e204555..f5b01dd39126 100644
--- a/Source/Core/Core/DSP/DSPEmitter.h
+++ b/Source/Core/Core/DSP/DSPEmitter.h
@@ -33,7 +33,6 @@ class DSPEmitter : public Gen::X64CodeBlock
 	void CompileDispatcher();
 	Block CompileStub();
 	void Compile(u16 start_addr);
-	void ClearCallFlag();
 
 	bool FlagsNeeded();
 
@@ -62,7 +61,6 @@ class DSPEmitter : public Gen::X64CodeBlock
 	void dmem_write_imm(u16 addr, Gen::X64Reg value);
 
 	// Ext command helpers
-	void pushExtValueFromReg(u16 dreg, u16 sreg);
 	void popExtValueToReg();
 	void pushExtValueFromMem(u16 dreg, u16 sreg);
 	void pushExtValueFromMem2(u16 dreg, u16 sreg);
diff --git a/Source/Core/Core/FifoPlayer/FifoPlaybackAnalyzer.h b/Source/Core/Core/FifoPlayer/FifoPlaybackAnalyzer.h
index 67244c507e53..714aa701fbe8 100644
--- a/Source/Core/Core/FifoPlayer/FifoPlaybackAnalyzer.h
+++ b/Source/Core/Core/FifoPlayer/FifoPlaybackAnalyzer.h
@@ -34,7 +34,6 @@ class FifoPlaybackAnalyzer
 	void AddMemoryUpdate(MemoryUpdate memUpdate, AnalyzedFrameInfo &frameInfo);
 
 	u32 DecodeCommand(u8 *data);
-	void LoadBP(u32 value0);
 
 	void StoreEfbCopyRegion();
 	void StoreWrittenRegion(u32 address, u32 size);
diff --git a/Source/Core/Core/HW/CPU.h b/Source/Core/Core/HW/CPU.h
index 9475d93d6c2e..52d9cd0df90f 100644
--- a/Source/Core/Core/HW/CPU.h
+++ b/Source/Core/Core/HW/CPU.h
@@ -30,9 +30,6 @@ class CCPU
 	// StepOpcode (Steps one Opcode)
 	static void StepOpcode(Common::Event *event = nullptr);
 
-	// one step only
-	static void SingleStep();
-
 	// Enable or Disable Stepping
 	static void EnableStepping(const bool _bStepping);
 
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
index 55c4c9ed6f24..5fc1ca904592 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
@@ -158,10 +158,7 @@ void ControlChannel(int _WiimoteNumber, u16 _channelID, const void* _pData, u32
 void Update(int _WiimoteNumber);
 void ConnectOnInput(int _WiimoteNumber);
 
-void DoState(PointerWrap &p);
 void StateChange(EMUSTATE_CHANGE newState);
-
-int FindWiimotes(Wiimote** wm, int max_wiimotes);
 void ChangeWiimoteSource(unsigned int index, int source);
 
 bool IsValidBluetoothName(const std::string& name);
diff --git a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.h b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.h
index 2391be80dea9..776c1ca7844e 100644
--- a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.h
+++ b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.h
@@ -144,8 +144,6 @@ class CWII_IPC_HLE_Device_es : public IWII_IPC_HLE_Device
 
 	static u8 *keyTable[11];
 
-	u64 GetCurrentTitleID() const;
-
 	const DiscIO::INANDContentLoader& AccessContentDevice(u64 _TitleID);
 	u32 OpenTitleContent(u32 CFD, u64 TitleID, u16 Index);
 
diff --git a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.h b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.h
index bca0730635e8..0fbc2631a1b7 100644
--- a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.h
+++ b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_net.h
@@ -612,8 +612,6 @@ class CWII_IPC_HLE_Device_net_ip_top : public IWII_IPC_HLE_Device
 #ifdef _WIN32
 	WSADATA InitData;
 #endif
-	u32 ExecuteCommand(u32 _Parameter, u32 _BufferIn, u32 _BufferInSize, u32 _BufferOut, u32 _BufferOutSize);
-	u32 ExecuteCommandV(SIOCtlVBuffer& CommandBuffer);
 };
 
 // **********************************************************************************
diff --git a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_usb.h b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_usb.h
index c516dfac5ac8..cd8c7446b64f 100644
--- a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_usb.h
+++ b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_Device_usb.h
@@ -75,8 +75,6 @@ class CWII_IPC_HLE_Device_usb_oh1_57e_305 : public IWII_IPC_HLE_Device
 
 	void DoState(PointerWrap &p) override;
 
-	void NetPlay_WiimoteUpdate(int _number);
-
 private:
 	enum USBIOCtl
 	{
diff --git a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_WiiMote.h b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_WiiMote.h
index bb858ac07d76..e9b5bbc3e926 100644
--- a/Source/Core/Core/IPC_HLE/WII_IPC_HLE_WiiMote.h
+++ b/Source/Core/Core/IPC_HLE/WII_IPC_HLE_WiiMote.h
@@ -57,8 +57,6 @@ class CWII_IPC_HLE_WiiMote
 	void ExecuteL2capCmd(u8* _pData, u32 _Size); // From CPU
 	void ReceiveL2capData(u16 scid, const void* _pData, u32 _Size); // From Wiimote
 
-	int NetPlay_GetWiimoteNum(int _number);
-
 	void EventConnectionAccepted();
 	void EventDisconnect();
 	bool EventPagingChanged(u8 _pageMode);
@@ -143,6 +141,4 @@ class CWII_IPC_HLE_WiiMote
 	void SDPSendServiceAttributeResponse(u16 _SCID, u16 TransactionID, u32 _ServiceHandle,
 											u16 _StartAttrID, u16 _EndAttrID,
 											u16 _MaximumAttributeByteCount, u8* _pContinuationState);
-
-	u16 AddAttribToList(int _AttribID, u8* _pBuffer);
 };
diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index 56e38ef7b209..c95aeeaf8ec8 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -135,8 +135,6 @@ class NetPlayClient : public TraversalClientClient
 	void Disconnect();
 	bool Connect();
 
-	void OnTraversalDisconnect(int fail);
-
 	PlayerId m_pid;
 	std::map<PlayerId, Player> m_players;
 	std::string m_host_spec;
diff --git a/Source/Core/Core/PowerPC/Interpreter/Interpreter.h b/Source/Core/Core/PowerPC/Interpreter/Interpreter.h
index fd8ee933c690..8203a2bd1475 100644
--- a/Source/Core/Core/PowerPC/Interpreter/Interpreter.h
+++ b/Source/Core/Core/PowerPC/Interpreter/Interpreter.h
@@ -20,7 +20,6 @@ class Interpreter : public CPUCoreBase
 public:
 	void Init() override;
 	void Shutdown() override;
-	void Reset();
 	void SingleStep() override;
 	int SingleStepInner();
 
@@ -28,8 +27,6 @@ class Interpreter : public CPUCoreBase
 	void ClearCache() override;
 	const char *GetName() override;
 
-	void Log();
-
 	static bool m_EndBlock;
 
 	static void unknown_instruction(UGeckoInstruction _inst);
@@ -269,7 +266,6 @@ class Interpreter : public CPUCoreBase
 	static void crxor(UGeckoInstruction _inst);
 	static void mcrf(UGeckoInstruction _inst);
 	static void rfi(UGeckoInstruction _inst);
-	static void rfid(UGeckoInstruction _inst);
 	static void sync(UGeckoInstruction _inst);
 	static void isync(UGeckoInstruction _inst);
 
diff --git a/Source/Core/Core/PowerPC/JitILCommon/JitILBase.h b/Source/Core/Core/PowerPC/JitILCommon/JitILBase.h
index f536113812e3..3d1aec4c8b95 100644
--- a/Source/Core/Core/PowerPC/JitILCommon/JitILBase.h
+++ b/Source/Core/Core/PowerPC/JitILCommon/JitILBase.h
@@ -94,13 +94,9 @@ class JitILBase : public Jitx86Base
 
 	void reg_imm(UGeckoInstruction inst);
 
-	void ps_sel(UGeckoInstruction inst);
-	void ps_mr(UGeckoInstruction inst);
-	void ps_sign(UGeckoInstruction inst); //aggregate
 	void ps_arith(UGeckoInstruction inst); //aggregate
 	void ps_mergeXX(UGeckoInstruction inst);
 	void ps_maddXX(UGeckoInstruction inst);
-	void ps_rsqrte(UGeckoInstruction inst);
 	void ps_sum(UGeckoInstruction inst);
 	void ps_muls(UGeckoInstruction inst);
 
diff --git a/Source/Core/Core/PowerPC/SignatureDB.h b/Source/Core/Core/PowerPC/SignatureDB.h
index 3cf12cf60eeb..85f5268e2492 100644
--- a/Source/Core/Core/PowerPC/SignatureDB.h
+++ b/Source/Core/Core/PowerPC/SignatureDB.h
@@ -35,7 +35,6 @@ class SignatureDB
 
 	bool Load(const std::string& filename);  // Does not clear. Remember to clear first if that's what you want.
 	bool Save(const std::string& filename);
-	void Clean(const char *prefix);
 	void Clear();
 	void List();
 
diff --git a/Source/Core/DiscIO/VolumeCreator.h b/Source/Core/DiscIO/VolumeCreator.h
index f6e928e81e0f..c3173a517228 100644
--- a/Source/Core/DiscIO/VolumeCreator.h
+++ b/Source/Core/DiscIO/VolumeCreator.h
@@ -16,7 +16,6 @@ class IBlobReader;
 
 IVolume* CreateVolumeFromFilename(const std::string& _rFilename, u32 _PartitionGroup = 0, u32 _VolumeNum = -1);
 IVolume* CreateVolumeFromDirectory(const std::string& _rDirectory, bool _bIsWii, const std::string& _rApploader = "", const std::string& _rDOL = "");
-bool IsVolumeWiiDisc(const IVolume *_rVolume);
 bool IsVolumeWadFile(const IVolume *_rVolume);
 void VolumeKeyForPartition(IBlobReader& _rReader, u64 offset, u8* VolumeKey);
 
diff --git a/Source/Core/DolphinWX/Debugger/CodeWindow.h b/Source/Core/DolphinWX/Debugger/CodeWindow.h
index 69574e202012..bafed76fec7f 100644
--- a/Source/Core/DolphinWX/Debugger/CodeWindow.h
+++ b/Source/Core/DolphinWX/Debugger/CodeWindow.h
@@ -62,11 +62,9 @@ class CCodeWindow : public wxPanel
 	void CreateMenu(const SConfig& _LocalCoreStartupParameter, wxMenuBar *pMenuBar);
 	void CreateMenuOptions(wxMenu *pMenu);
 	void CreateMenuSymbols(wxMenuBar *pMenuBar);
-	void RecreateToolbar(wxToolBar*);
 	void PopulateToolbar(wxToolBar* toolBar);
 	void UpdateButtonStates();
 	void OpenPages();
-	void UpdateManager();
 
 	// Menu bar
 	void ToggleCodeWindow(bool bShow);
diff --git a/Source/Core/DolphinWX/Debugger/DebuggerPanel.h b/Source/Core/DolphinWX/Debugger/DebuggerPanel.h
index 8715c29f2c41..35d2e2d5b016 100644
--- a/Source/Core/DolphinWX/Debugger/DebuggerPanel.h
+++ b/Source/Core/DolphinWX/Debugger/DebuggerPanel.h
@@ -74,5 +74,4 @@ class GFXDebuggerPanel : public wxPanel, public GFXDebuggerBase
 	void OnClearTextureCacheButton(wxCommandEvent& event);
 	void OnClearVertexShaderCacheButton(wxCommandEvent& event);
 	void OnClearPixelShaderCacheButton(wxCommandEvent& event);
-	void OnCountEnter(wxCommandEvent& event);
 };
diff --git a/Source/Core/DolphinWX/Debugger/JitWindow.h b/Source/Core/DolphinWX/Debugger/JitWindow.h
index ad7bbe666d58..b54805212205 100644
--- a/Source/Core/DolphinWX/Debugger/JitWindow.h
+++ b/Source/Core/DolphinWX/Debugger/JitWindow.h
@@ -47,8 +47,5 @@ class CJitWindow : public wxPanel
 	wxTextCtrl* ppc_box;
 	wxTextCtrl* x86_box;
 
-	void OnSymbolListChange(wxCommandEvent& event);
-	void OnCallstackListChange(wxCommandEvent& event);
-	void OnAddrBoxChange(wxCommandEvent& event);
 	void OnHostMessage(wxCommandEvent& event);
 };
diff --git a/Source/Core/DolphinWX/Debugger/MemoryWindow.h b/Source/Core/DolphinWX/Debugger/MemoryWindow.h
index b5cc8d7f4f51..fecb56f7e385 100644
--- a/Source/Core/DolphinWX/Debugger/MemoryWindow.h
+++ b/Source/Core/DolphinWX/Debugger/MemoryWindow.h
@@ -42,7 +42,6 @@ class CMemoryWindow : public wxPanel
 	void onAscii(wxCommandEvent& event);
 	void onHex(wxCommandEvent& event);
 	void OnSymbolListChange(wxCommandEvent& event);
-	void OnCallstackListChange(wxCommandEvent& event);
 	void OnAddrBoxChange(wxCommandEvent& event);
 	void OnHostMessage(wxCommandEvent& event);
 	void SetMemoryValueFromValBox(wxCommandEvent& event);
diff --git a/Source/Core/DolphinWX/Debugger/WatchWindow.h b/Source/Core/DolphinWX/Debugger/WatchWindow.h
index 07b8fd6b2a93..fd5ce9467227 100644
--- a/Source/Core/DolphinWX/Debugger/WatchWindow.h
+++ b/Source/Core/DolphinWX/Debugger/WatchWindow.h
@@ -27,8 +27,6 @@ class CWatchWindow : public wxPanel
 	void LoadAll();
 
 private:
-	void CreateGUIControls();
-
 	wxAuiManager m_mgr;
 
 	// Owned by wx. Deleted implicitly upon destruction.
diff --git a/Source/Core/DolphinWX/Frame.h b/Source/Core/DolphinWX/Frame.h
index 31eeb2745a94..1d3a377b05ac 100644
--- a/Source/Core/DolphinWX/Frame.h
+++ b/Source/Core/DolphinWX/Frame.h
@@ -300,7 +300,6 @@ class CFrame : public CRenderFrame
 	void OnToggleFullscreen(wxCommandEvent& event);
 	void OnToggleDualCore(wxCommandEvent& event);
 	void OnToggleSkipIdle(wxCommandEvent& event);
-	void OnToggleThrottle(wxCommandEvent& event);
 	void OnManagerResize(wxAuiManagerEvent& event);
 	void OnMove(wxMoveEvent& event);
 	void OnResize(wxSizeEvent& event);
diff --git a/Source/Core/DolphinWX/GameListCtrl.h b/Source/Core/DolphinWX/GameListCtrl.h
index 5a0ec77cb266..fb504d267b36 100644
--- a/Source/Core/DolphinWX/GameListCtrl.h
+++ b/Source/Core/DolphinWX/GameListCtrl.h
@@ -96,7 +96,6 @@ class CGameListCtrl : public wxListCtrl
 	void OnCompressISO(wxCommandEvent& event);
 	void OnMultiCompressISO(wxCommandEvent& event);
 	void OnMultiDecompressISO(wxCommandEvent& event);
-	void OnInstallWAD(wxCommandEvent& event);
 	void OnChangeDisc(wxCommandEvent& event);
 
 	void CompressSelection(bool _compress);
diff --git a/Source/Core/DolphinWX/TASInputDlg.h b/Source/Core/DolphinWX/TASInputDlg.h
index a25a6c4c7cea..71a0db4b50f0 100644
--- a/Source/Core/DolphinWX/TASInputDlg.h
+++ b/Source/Core/DolphinWX/TASInputDlg.h
@@ -38,18 +38,13 @@ class TASInputDlg : public wxDialog
 		void GetValues(GCPadStatus* PadStatus);
 		void GetValues(u8* data, WiimoteEmu::ReportFeatures rptf, int ext, const wiimote_key key);
 		void SetTurbo(wxMouseEvent& event);
-		void SetTurboFalse(wxMouseEvent& event);
-		void SetTurboState(wxCheckBox* CheckBox, bool* turbo_on);
 		void ButtonTurbo();
 		void GetKeyBoardInput(GCPadStatus* PadStatus);
 		void GetKeyBoardInput(u8* data, WiimoteEmu::ReportFeatures rptf, int ext, const wiimote_key key);
-		bool TextBoxHasFocus();
-		void SetLandRTriggers();
 		void CreateGCLayout();
 		void CreateWiiLayout(int num);
 		wxBitmap CreateStickBitmap(int x, int y);
 		void SetWiiButtons(u16* butt);
-		void GetIRData(u8* const data, u8 mode, bool use_accel);
 		void HandleExtensionChange();
 
 	private:
diff --git a/Source/Core/InputCommon/ControllerInterface/Device.h b/Source/Core/InputCommon/ControllerInterface/Device.h
index c27910af5ddd..7e6172149f70 100644
--- a/Source/Core/InputCommon/ControllerInterface/Device.h
+++ b/Source/Core/InputCommon/ControllerInterface/Device.h
@@ -61,8 +61,6 @@ class Device
 
 		virtual ControlState GetState() const = 0;
 
-		bool ShouldHaveInput();
-
 		ControlState GetGatedState()
 		{
 			if (InputGateOn())
diff --git a/Source/Core/VideoBackends/Software/TransformUnit.h b/Source/Core/VideoBackends/Software/TransformUnit.h
index 4cd2695afbaa..fa62b0586fe7 100644
--- a/Source/Core/VideoBackends/Software/TransformUnit.h
+++ b/Source/Core/VideoBackends/Software/TransformUnit.h
@@ -9,11 +9,6 @@ struct OutputVertexData;
 
 namespace TransformUnit
 {
-	void MultiplyVec2Mat24(const float *vec, const float *mat, float *result);
-	void MultiplyVec2Mat34(const float *vec, const float *mat, float *result);
-	void MultiplyVec3Mat33(const float *vec, const float *mat, float *result);
-	void MultiplyVec3Mat34(const float *vec, const float *mat, float *result);
-
 	void TransformPosition(const InputVertexData *src, OutputVertexData *dst);
 	void TransformNormal(const InputVertexData *src, bool nbt, OutputVertexData *dst);
 	void TransformColor(const InputVertexData *src, OutputVertexData *dst);
diff --git a/Source/Core/VideoBackends/Software/VideoBackend.h b/Source/Core/VideoBackends/Software/VideoBackend.h
index c7c502995b31..e34ae07f9ad2 100644
--- a/Source/Core/VideoBackends/Software/VideoBackend.h
+++ b/Source/Core/VideoBackends/Software/VideoBackend.h
@@ -42,10 +42,6 @@ class VideoSoftware : public VideoBackend
 	void Video_ClearMessages() override;
 	bool Video_Screenshot(const std::string& filename) override;
 
-	int Video_LoadTexture(char *imagedata, u32 width, u32 height);
-	void Video_DeleteTexture(int texID);
-	void Video_DrawTexture(int texID, float *coords);
-
 	void Video_SetRendering(bool bEnabled) override;
 
 	void Video_GatherPipeBursted() override;
diff --git a/Source/Core/VideoCommon/PixelShaderManager.h b/Source/Core/VideoCommon/PixelShaderManager.h
index 149b9cc55b3d..b3a7e8419b7d 100644
--- a/Source/Core/VideoCommon/PixelShaderManager.h
+++ b/Source/Core/VideoCommon/PixelShaderManager.h
@@ -39,7 +39,6 @@ class PixelShaderManager
 	static void SetEfbScaleChanged();
 	static void SetZSlope(float dfdx, float dfdy, float f0);
 	static void SetIndMatrixChanged(int matrixidx);
-	static void SetTevKSelChanged(int id);
 	static void SetZTextureTypeChanged();
 	static void SetIndTexScaleChanged(bool high);
 	static void SetTexCoordChanged(u8 texmapid);
diff --git a/Source/Core/VideoCommon/VertexLoader_Position.h b/Source/Core/VideoCommon/VertexLoader_Position.h
index 65a97e5bde30..306a1a8c4a1a 100644
--- a/Source/Core/VideoCommon/VertexLoader_Position.h
+++ b/Source/Core/VideoCommon/VertexLoader_Position.h
@@ -6,12 +6,9 @@
 
 #include "VideoCommon/NativeVertexFormat.h"
 
-class VertexLoader_Position {
+class VertexLoader_Position
+{
 public:
-
-	// Init
-	static void Init();
-
 	// GetSize
 	static unsigned int GetSize(u64 _type, unsigned int _format, unsigned int _elements);
 
diff --git a/Source/Core/VideoCommon/VertexLoader_TextCoord.h b/Source/Core/VideoCommon/VertexLoader_TextCoord.h
index 0e3c7bac62c9..4d8d352058e1 100644
--- a/Source/Core/VideoCommon/VertexLoader_TextCoord.h
+++ b/Source/Core/VideoCommon/VertexLoader_TextCoord.h
@@ -9,10 +9,6 @@
 class VertexLoader_TextCoord
 {
 public:
-
-	// Init
-	static void Init();
-
 	// GetSize
 	static unsigned int GetSize(u64 _type, unsigned int _format, unsigned int _elements);
 
diff --git a/Source/Core/VideoCommon/VideoBackendBase.h b/Source/Core/VideoCommon/VideoBackendBase.h
index 2b3ee0f6b9f8..f6cd1d12bffb 100644
--- a/Source/Core/VideoCommon/VideoBackendBase.h
+++ b/Source/Core/VideoCommon/VideoBackendBase.h
@@ -160,5 +160,4 @@ class VideoBackendHardware : public VideoBackend
 
 protected:
 	void InitializeShared();
-	void InvalidState();
 };