diff --git a/boards/arm/stm32l562e_dk/doc/index.rst b/boards/arm/stm32l562e_dk/doc/index.rst
index a35097a7d12..00b75c02f18 100644
--- a/boards/arm/stm32l562e_dk/doc/index.rst
+++ b/boards/arm/stm32l562e_dk/doc/index.rst
@@ -197,6 +197,7 @@ Default Zephyr Peripheral Mapping:
 ----------------------------------
 
 - USART_1 TX/RX : PA9/PA10
+- USART_3 TX/RX : PC10/PC11
 - I2C_1 SCL/SDA : PB6/PB7
 - SPI_1 SCK/MISO/MOSI : PG2/PG3/PG4 (BT SPI bus)
 - SPI_3 NSS/SCK/MISO/MOSI : PE0/PG9/PB4/PB5 (Arduino SPI)
diff --git a/boards/arm/stm32l562e_dk/stm32l562e_dk.yaml b/boards/arm/stm32l562e_dk/stm32l562e_dk.yaml
index 5b71d8dd00f..e14807056b6 100644
--- a/boards/arm/stm32l562e_dk/stm32l562e_dk.yaml
+++ b/boards/arm/stm32l562e_dk/stm32l562e_dk.yaml
@@ -16,6 +16,7 @@ supported:
   - adc
   - spi
   - dma
+  - usart
   - arduino_spi
 ram: 192
 flash: 512
diff --git a/boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi b/boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi
index e3f0e18e068..a785e6991c5 100644
--- a/boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi
+++ b/boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi
@@ -84,6 +84,12 @@
 	status = "okay";
 };
 
+&usart3 {
+	pinctrl-0 = <&usart3_tx_pc10 &usart3_rx_pc11>;
+	current-speed = <115200>;
+	status = "okay";
+};
+
 &i2c1 {
 	pinctrl-0 = <&i2c1_scl_pb6 &i2c1_sda_pb7>;
 	status = "okay";