diff --git a/gfxconf.example.h b/gfxconf.example.h
index 27c55a2a..0753cf64 100644
--- a/gfxconf.example.h
+++ b/gfxconf.example.h
@@ -34,6 +34,8 @@
 //#define GFX_USE_OS_OSX                               FALSE
 //#define GFX_USE_OS_ECOS                              FALSE
 //#define GFX_USE_OS_RAWRTOS                           FALSE
+//#define GFX_USE_OS_ARDUINO                           FALSE
+//#define GFX_USE_OS_KEIL                              FALSE
 //#define GFX_USE_OS_RAW32                             FALSE
 //    #define INTERRUPTS_OFF()                         optional_code
 //    #define INTERRUPTS_ON()                          optional_code
diff --git a/src/gos/gos.h b/src/gos/gos.h
index 82ad9d1c..9d32867a 100644
--- a/src/gos/gos.h
+++ b/src/gos/gos.h
@@ -464,6 +464,8 @@
 	#include "src/gos/gos_ecos.h"
 #elif GFX_USE_OS_ARDUINO
 	#include "src/gos/gos_arduino.h"
+#elif GFX_USE_OS_KEIL
+	#include "src/gos/gos_keil.h"
 #else
 	#error "Your operating system is not supported yet"
 #endif
diff --git a/src/gos/gos.mk b/src/gos/gos.mk
index 1c3a86a5..8e8eb907 100644
--- a/src/gos/gos.mk
+++ b/src/gos/gos.mk
@@ -12,6 +12,7 @@ GFXSRC +=   $(GFXLIB)/src/gos/gos_chibios.c	\
 			$(GFXLIB)/src/gos/gos_ecos.c \
 			$(GFXLIB)/src/gos/gos_rawrtos.c \
 			$(GFXLIB)/src/gos/gos_arduino.c \
+			$(GFXLIB)/src/gos/gos_keil.c \
 			$(GFXLIB)/src/gos/gos_x_threads.c \
 			$(GFXLIB)/src/gos/gos_x_heap.c
 
diff --git a/src/gos/gos_keil.c b/src/gos/gos_keil.c
new file mode 100644
index 00000000..72b37404
--- /dev/null
+++ b/src/gos/gos_keil.c
@@ -0,0 +1,80 @@
+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+#include "gfx.h"
+#include <string.h>
+
+#if GFX_USE_OS_KEIL
+
+void _gosInit(void)
+{
+	#if !GFX_OS_NO_INIT
+		osKernelInitialize();
+		if (!osKernelRunning())
+			osKernelStart();
+	#elif !GFX_OS_INIT_NO_WARNING
+		#warning "GOS: Operating System initialization has been turned off. Make sure you call osKernelInitialize() and osKernelStart() before gfxInit() in your application!"
+	#endif
+
+	// Set up the heap allocator
+	_gosHeapInit();
+}
+
+void _gosDeinit(void)
+{
+}
+
+void gfxMutexInit(gfxMutex* pmutex)
+{
+	pmutex->id = osMutexCreate(pmutex->osMutex(id));
+}
+
+void gfxSemInit(gfxSem* psem, semcount_t val, semcount_t limit)
+{
+	psem->id = osSemaphoreCreate(psem->osSemaphore(id), limit);
+	while(val--)
+		osSemaphoreRelease(psem->id);
+}
+
+void gfxSemDestroy(gfxSem* psem)
+{
+	osSemaphoreDelete(psem->id);
+}
+
+bool_t gfxSemWait(gfxSem* psem, delaytime_t ms)
+{
+	return osSemaphoreWait(psem->id, ms) > 0;
+}
+
+bool_t gfxSemWaitI(gfxSem* psem)
+{
+	return osSemaphoreWait(psem->id, 0) > 0;
+}
+
+void gfxSemSignal(gfxSem* psem)
+{
+	osSemaphoreRelease(psem->id);
+}
+
+void gfxSemSignalI(gfxSem* psem)
+{
+	osSemaphoreRelease(psem->id);
+}
+
+gfxThreadHandle gfxThreadCreate(void* stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void* param)
+{
+	osThreadDef(ugfx_thread, prio, 1, stacksz);
+
+	return osThreadCreate(osThread(ugfx_thread), param);
+}
+
+threadreturn_t gfxThreadWait(gfxThreadHandle thread) {
+	while(osThreadGetPriority(thread) == osPriorityError)
+		gfxYield();
+}
+
+#endif /* GFX_USE_OS_KEIL */
diff --git a/src/gos/gos_keil.h b/src/gos/gos_keil.h
new file mode 100644
index 00000000..df2db720
--- /dev/null
+++ b/src/gos/gos_keil.h
@@ -0,0 +1,99 @@
+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+/**
+ * @file    src/gos/gos_keil.h
+ * @brief   GOS - Operating System Support header file for Keil RTX.
+ */
+
+#ifndef _GOS_KEIL_H
+#define _GOS_KEIL_H
+
+#if GFX_USE_OS_KEIL
+
+#ifndef GFX_OS_HEAP_SIZE
+	#define GFX_OS_HEAP_SIZE 10240
+#endif
+
+/*===========================================================================*/
+/* Type definitions                                                          */
+/*===========================================================================*/
+
+#define TIME_IMMEDIATE		0
+#define TIME_INFINITE		osWaitForever
+typedef uint32_t			delaytime_t;
+typedef uint32_t			systemticks_t;
+typedef uint16_t			semcount_t;
+typedef void				threadreturn_t;
+typedef osPriority			threadpriority_t;
+
+#define MAX_SEMAPHORE_COUNT	osFeature_Semaphore
+#define LOW_PRIORITY		osPriorityLow
+#define NORMAL_PRIORITY		osPriorityNormal
+#define HIGH_PRIORITY		osPriorityHigh
+
+typedef struct gfxSem {
+	osSemaphoreId	id;
+	osSemaphoreDef(id);
+	} gfxSem;
+
+typedef struct gfxMutex {
+	osMutexId	id;
+	osMutexDef(id);
+	} gfxMutex;
+
+typedef osThreadId			gfxThreadHandle;
+
+#define DECLARE_THREAD_STACK(name, sz)
+#define DECLARE_THREAD_FUNCTION(fnName, param)	threadreturn_t fnName(void* params)
+
+/*===========================================================================*/
+/* Function declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define gfxExit()					os_error(0)
+#define gfxHalt(msg)				os_error(1)
+#define gfxSystemTicks()			osKernelSysTick()
+#define gfxMillisecondsToTicks(ms)	osKernelSysTickMicroSec(1000*(ms))
+#define gfxSystemLock()				osKernelInitialize()
+#define gfxSystemUnlock()			osKernelStart()
+#define gfxSleepMilliseconds(ms) 	osDelay(ms)
+
+void gfxMutexInit(gfxMutex* pmutex);
+#define gfxMutexDestroy(pmutex)		osMutexDelete((pmutex)->id)
+#define gfxMutexEnter(pmutex)		osMutexWait((pmutex)->id, TIME_INFINITE)
+#define gfxMutexExit(pmutex)		osMutexRelease((pmutex)->id)
+
+void gfxSemInit(gfxSem* psem, semcount_t val, semcount_t limit);
+void gfxSemDestroy(gfxSem* psem);
+bool_t gfxSemWait(gfxSem* psem, delaytime_t ms);
+bool_t gfxSemWaitI(gfxSem* psem);
+void gfxSemSignal(gfxSem* psem);
+void gfxSemSignalI(gfxSem* psem);
+
+gfxThreadHandle gfxThreadCreate(void* stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void* param);
+#define gfxYield()					osThreadYield()
+#define gfxThreadMe()				osThreadGetId()
+#define gfxThreadClose(thread)		{}
+
+#ifdef __cplusplus
+}
+#endif
+
+/*===========================================================================*/
+/* Use the generic thread handling and heap handling                         */
+/*===========================================================================*/
+
+#define GOS_NEED_X_HEAP		TRUE
+#include "gos_x_heap.h"
+
+#endif /* GFX_USE_OS_KEIL */
+#endif /* _GOS_KEIL_H */
diff --git a/src/gos/gos_mk.c b/src/gos/gos_mk.c
index 1b033206..13808791 100644
--- a/src/gos/gos_mk.c
+++ b/src/gos/gos_mk.c
@@ -14,5 +14,6 @@
 #include "gos_raw32.c"
 #include "gos_rawrtos.c"
 #include "gos_win32.c"
+#include "gos_keil.c"
 #include "gos_x_threads.c"
 #include "gos_x_heap.c"
diff --git a/src/gos/gos_options.h b/src/gos/gos_options.h
index c80a9f39..1521a123 100644
--- a/src/gos/gos_options.h
+++ b/src/gos/gos_options.h
@@ -76,6 +76,13 @@
 	#ifndef GFX_USE_OS_ARDUINO
 		#define GFX_USE_OS_ARDUINO		FALSE
 	#endif
+	/**
+	 * @brief   Use Keil CMSIS
+	 * @details	Defaults to FALSE
+	 */
+	#ifndef GFX_USE_OS_KEIL
+		#define GFX_USE_OS_KEIL		FALSE
+	#endif
 /**
  * @}
  *
diff --git a/src/gos/gos_rules.h b/src/gos/gos_rules.h
index 6eea98c9..49d32b1d 100644
--- a/src/gos/gos_rules.h
+++ b/src/gos/gos_rules.h
@@ -16,7 +16,7 @@
 #ifndef _GOS_RULES_H
 #define _GOS_RULES_H
 
-#if !GFX_USE_OS_CHIBIOS && !GFX_USE_OS_WIN32 && !GFX_USE_OS_LINUX && !GFX_USE_OS_OSX && !GFX_USE_OS_RAW32 && !GFX_USE_OS_FREERTOS && !GFX_USE_OS_ECOS && !GFX_USE_OS_RAWRTOS && !GFX_USE_OS_ARDUINO
+#if !GFX_USE_OS_CHIBIOS && !GFX_USE_OS_WIN32 && !GFX_USE_OS_LINUX && !GFX_USE_OS_OSX && !GFX_USE_OS_RAW32 && !GFX_USE_OS_FREERTOS && !GFX_USE_OS_ECOS && !GFX_USE_OS_RAWRTOS && !GFX_USE_OS_ARDUINO && !GFX_USE_OS_KEIL
 	#if GFX_DISPLAY_RULE_WARNINGS
 		#warning "GOS: No Operating System has been defined. ChibiOS (GFX_USE_OS_CHIBIOS) has been turned on for you."
 	#endif
@@ -24,7 +24,7 @@
 	#define GFX_USE_OS_CHIBIOS	TRUE
 #endif
 
-#if GFX_USE_OS_CHIBIOS + GFX_USE_OS_WIN32 + GFX_USE_OS_LINUX + GFX_USE_OS_OSX + GFX_USE_OS_RAW32 + GFX_USE_OS_FREERTOS + GFX_USE_OS_ECOS + GFX_USE_OS_RAWRTOS + GFX_USE_OS_ARDUINO != 1 * TRUE
+#if GFX_USE_OS_CHIBIOS + GFX_USE_OS_WIN32 + GFX_USE_OS_LINUX + GFX_USE_OS_OSX + GFX_USE_OS_RAW32 + GFX_USE_OS_FREERTOS + GFX_USE_OS_ECOS + GFX_USE_OS_RAWRTOS + GFX_USE_OS_ARDUINO + GFX_USE_OS_KEIL != 1 * TRUE
 	#error "GOS: More than one operation system has been defined as TRUE."
 #endif