diff --git a/cpu/stm32_common/periph/flash_common.c b/cpu/stm32_common/periph/flash_common.c
index 61c6d8d10f..e254b99486 100644
--- a/cpu/stm32_common/periph/flash_common.c
+++ b/cpu/stm32_common/periph/flash_common.c
@@ -31,6 +31,10 @@
 #define CNTRL_REG_LOCK         (FLASH_PECR_PELOCK)
 #define KEY_REG                (FLASH->PEKEYR)
 #else
+#if defined(CPU_FAM_STM32L4)
+#define FLASH_KEY1             ((uint32_t)0x45670123)
+#define FLASH_KEY2             ((uint32_t)0xCDEF89AB)
+#endif
 #define CNTRL_REG              (FLASH->CR)
 #define CNTRL_REG_LOCK         (FLASH_CR_LOCK)
 #define KEY_REG                (FLASH->KEYR)
diff --git a/cpu/stm32_common/periph/flashpage.c b/cpu/stm32_common/periph/flashpage.c
index 9bbebd36ad..f7b8296902 100644
--- a/cpu/stm32_common/periph/flashpage.c
+++ b/cpu/stm32_common/periph/flashpage.c
@@ -41,9 +41,13 @@
 #define FLASH_CR_PG            (FLASH_PECR_FPRG | FLASH_PECR_PROG)
 #define FLASHPAGE_DIV          (4U) /* write 4 bytes in one go */
 #else
+#if defined(CPU_FAM_STM32L4)
+#define FLASHPAGE_DIV          (8U)
+#else
+#define FLASHPAGE_DIV          (2U)
+#endif
 #define CNTRL_REG              (FLASH->CR)
 #define CNTRL_REG_LOCK         (FLASH_CR_LOCK)
-#define FLASHPAGE_DIV          (2U)
 #endif
 
 extern void _lock(void);
@@ -78,7 +82,8 @@ static void _wait_for_pending_operations(void)
 
 static void _erase_page(void *page_addr)
 {
-#if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1)
+#if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1) || \
+    defined(CPU_FAM_STM32L4)
     uint32_t *dst = page_addr;
 #else
     uint16_t *dst = page_addr;
@@ -101,7 +106,25 @@ static void _erase_page(void *page_addr)
 #if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1)
     DEBUG("[flashpage] erase: trigger the page erase\n");
     *dst = (uint32_t)0;
+#elif defined(CPU_FAM_STM32L4)
+    DEBUG("[flashpage] erase: setting the page address\n");
+    CNTRL_REG |= FLASH_CR_PER;
+    uint8_t pn;
+#if FLASHPAGE_NUMOF <= 256
+    pn = (uint8_t)flashpage_page(dst);
 #else
+    uint16_t page = flashpage_page(dst);
+    if (page > 255) {
+        CNTRL_REG |= FLASH_CR_BKER;
+    }
+    else {
+        CNTRL_REG &= ~FLASH_CR_BKER;
+    }
+    pn = (uint8_t)page;
+#endif
+    CNTRL_REG |= (uint32_t)(pn << FLASH_CR_PNB_Pos);
+    CNTRL_REG |= FLASH_CR_STRT;
+#else /* CPU_FAM_STM32F0 || CPU_FAM_STM32F1 */
     DEBUG("[flashpage] erase: setting the page address\n");
     FLASH->AR = (uint32_t)dst;
     /* trigger the page erase and wait for it to be finished */
@@ -118,7 +141,8 @@ static void _erase_page(void *page_addr)
     /* lock the flash module again */
     _lock();
 
-#if !(defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1))
+#if !(defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1) || \
+      defined(CPU_FAM_STM32L4))
     /* restore the HSI state */
     if (!hsi_state) {
         stmclk_disable_hsi();
@@ -143,6 +167,9 @@ void flashpage_write_raw(void *target_addr, const void *data, size_t len)
 #if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1)
     uint32_t *dst = target_addr;
     const uint32_t *data_addr = data;
+#elif defined(CPU_FAM_STM32L4)
+    uint64_t *dst = target_addr;
+    const uint64_t *data_addr = data;
 #else
     uint16_t *dst = (uint16_t *)target_addr;
     const uint16_t *data_addr = data;
@@ -174,7 +201,8 @@ void flashpage_write_raw(void *target_addr, const void *data, size_t len)
     /* lock the flash module again */
     _lock();
 
-#if !(defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1))
+#if !(defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1) || \
+      defined(CPU_FAM_STM32L4))
     /* restore the HSI state */
     if (!hsi_state) {
         stmclk_disable_hsi();
@@ -189,6 +217,8 @@ void flashpage_write(int page, const void *data)
 #if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1)
     /* STM32L0/L1 only supports word sizes */
     uint32_t *page_addr = flashpage_addr(page);
+#elif defined(CPU_FAM_STM32L4)
+    uint64_t *page_addr = flashpage_addr(page);
 #else
     /* Default is to support half-word sizes */
     uint16_t *page_addr = flashpage_addr(page);