diff --git a/arch/arm/soc/st_stm32/stm32f3/soc.c b/arch/arm/soc/st_stm32/stm32f3/soc.c
index b6bef916abc..936d441d257 100644
--- a/arch/arm/soc/st_stm32/stm32f3/soc.c
+++ b/arch/arm/soc/st_stm32/stm32f3/soc.c
@@ -55,6 +55,9 @@ static int stm32f3_init(struct device *arg)
 
 	irq_unlock(key);
 
+	/* Update CMSIS SystemCoreClock variable (HCLK) */
+	SystemCoreClock = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
+
 	return 0;
 }
 
diff --git a/arch/arm/soc/st_stm32/stm32f3/soc.h b/arch/arm/soc/st_stm32/stm32f3/soc.h
index 53c4323e482..ed4227bf446 100644
--- a/arch/arm/soc/st_stm32/stm32f3/soc.h
+++ b/arch/arm/soc/st_stm32/stm32f3/soc.h
@@ -58,6 +58,10 @@ enum stm32f3x_pin_config_mode {
 
 #include "soc_irq.h"
 
+#ifdef CONFIG_SERIAL_HAS_DRIVER
+#include <stm32f3xx_ll_usart.h>
+#endif
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32F3_SOC_H_ */
diff --git a/drivers/serial/uart_stm32.c b/drivers/serial/uart_stm32.c
index 090cf6095b6..3c4836ab287 100644
--- a/drivers/serial/uart_stm32.c
+++ b/drivers/serial/uart_stm32.c
@@ -286,7 +286,9 @@ static int uart_stm32_init(struct device *dev)
 
 	__uart_stm32_get_clock(dev);
 	/* enable clock */
-#if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32L4X)
+#if defined(CONFIG_SOC_SERIES_STM32F1X) || \
+    defined(CONFIG_SOC_SERIES_STM32F3X) || \
+    defined(CONFIG_SOC_SERIES_STM32L4X)
 	clock_control_on(data->clock, config->clock_subsys);
 #elif defined(CONFIG_SOC_SERIES_STM32F4X)
 	clock_control_on(data->clock,
@@ -325,6 +327,8 @@ static const struct uart_stm32_config uart_stm32_dev_cfg_1 = {
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART1),
+#elif CONFIG_SOC_SERIES_STM32F3X
+	.clock_subsys = UINT_TO_POINTER(STM32F3X_CLOCK_SUBSYS_USART1),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB2,
 		    .enr = STM32F4X_CLOCK_ENABLE_USART1 },
@@ -350,6 +354,8 @@ static void uart_stm32_irq_config_func_1(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_1_IRQ STM32F1_IRQ_USART1
+#elif CONFIG_SOC_SERIES_STM32F3X
+#define PORT_1_IRQ STM32F3_IRQ_USART1
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_1_IRQ STM32F4_IRQ_USART1
 #elif CONFIG_SOC_SERIES_STM32L4X
@@ -381,6 +387,8 @@ static const struct uart_stm32_config uart_stm32_dev_cfg_2 = {
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART2),
+#elif CONFIG_SOC_SERIES_STM32F3X
+	.clock_subsys = UINT_TO_POINTER(STM32F3X_CLOCK_SUBSYS_USART2),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.pclken = { .bus = STM32F4X_CLOCK_BUS_APB1,
 		    .enr = STM32F4X_CLOCK_ENABLE_USART2 },
@@ -406,6 +414,8 @@ static void uart_stm32_irq_config_func_2(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_2_IRQ STM32F1_IRQ_USART2
+#elif CONFIG_SOC_SERIES_STM32F3X
+#define PORT_2_IRQ STM32F3_IRQ_USART2
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_2_IRQ STM32F4_IRQ_USART2
 #elif CONFIG_SOC_SERIES_STM32L4X
@@ -437,6 +447,8 @@ static const struct uart_stm32_config uart_stm32_dev_cfg_3 = {
 	},
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 	.clock_subsys = UINT_TO_POINTER(STM32F10X_CLOCK_SUBSYS_USART3),
+#elif CONFIG_SOC_SERIES_STM32F3X
+	.clock_subsys = UINT_TO_POINTER(STM32F3X_CLOCK_SUBSYS_USART3),
 #elif CONFIG_SOC_SERIES_STM32F4X
 	.clock_subsys = UINT_TO_POINTER(STM32F40X_CLOCK_SUBSYS_USART3),
 #elif CONFIG_SOC_SERIES_STM32L4X
@@ -461,6 +473,8 @@ static void uart_stm32_irq_config_func_3(struct device *dev)
 {
 #ifdef CONFIG_SOC_SERIES_STM32F1X
 #define PORT_3_IRQ STM32F1_IRQ_USART3
+#elif CONFIG_SOC_SERIES_STM32F3X
+#define PORT_3_IRQ STM32F3_IRQ_USART3
 #elif CONFIG_SOC_SERIES_STM32F4X
 #define PORT_3_IRQ STM32F4_IRQ_USART3
 #elif CONFIG_SOC_SERIES_STM32L4X
diff --git a/drivers/serial/uart_stm32.h b/drivers/serial/uart_stm32.h
index d3b9704e478..34f0c7352bc 100644
--- a/drivers/serial/uart_stm32.h
+++ b/drivers/serial/uart_stm32.h
@@ -16,7 +16,9 @@
 struct uart_stm32_config {
 	struct uart_device_config uconf;
 	/* clock subsystem driving this peripheral */
-#if defined(CONFIG_SOC_SERIES_STM32F1X) || defined(CONFIG_SOC_SERIES_STM32L4X)
+#if defined(CONFIG_SOC_SERIES_STM32F1X) || \
+    defined(CONFIG_SOC_SERIES_STM32F3X) || \
+    defined(CONFIG_SOC_SERIES_STM32L4X)
 	clock_control_subsys_t clock_subsys;
 #elif defined(CONFIG_SOC_SERIES_STM32F4X)
 	struct stm32f4x_pclken pclken;
diff --git a/ext/hal/st/stm32cube/Kbuild b/ext/hal/st/stm32cube/Kbuild
index c8bbc87ec13..7876be5de47 100644
--- a/ext/hal/st/stm32cube/Kbuild
+++ b/ext/hal/st/stm32cube/Kbuild
@@ -10,6 +10,8 @@ endif
 
 ifdef CONFIG_SOC_SERIES_STM32F3X
 obj-y += stm32f3xx/drivers/src/stm32f3xx_hal.o
+obj-y += stm32f3xx/drivers/src/stm32f3xx_hal_rcc.o
+obj-$(CONFIG_SERIAL_HAS_DRIVER) += stm32f3xx/drivers/src/stm32f3xx_hal_uart.o
 obj-y += stm32f3xx/soc/system_stm32f3xx.o
 endif