diff --git a/boards/nordic/nrf54l20pdk/nrf54l20pdk_nrf54l20_cpuapp.yaml b/boards/nordic/nrf54l20pdk/nrf54l20pdk_nrf54l20_cpuapp.yaml
index d11ea0d869f..99b87bea0c2 100644
--- a/boards/nordic/nrf54l20pdk/nrf54l20pdk_nrf54l20_cpuapp.yaml
+++ b/boards/nordic/nrf54l20pdk/nrf54l20pdk_nrf54l20_cpuapp.yaml
@@ -15,3 +15,4 @@ flash: 449
 supported:
   - counter
   - gpio
+  - watchdog
diff --git a/samples/drivers/watchdog/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay b/samples/drivers/watchdog/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
new file mode 100644
index 00000000000..5c765a8a896
--- /dev/null
+++ b/samples/drivers/watchdog/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2024 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&wdt31 {
+	status = "okay";
+};
diff --git a/tests/drivers/watchdog/wdt_basic_api/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay b/tests/drivers/watchdog/wdt_basic_api/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
new file mode 100644
index 00000000000..8d3dce3b380
--- /dev/null
+++ b/tests/drivers/watchdog/wdt_basic_api/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&wdt31 {
+	status = "okay";
+};
diff --git a/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l05_cpuapp.overlay b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l05_cpuapp.overlay
new file mode 100644
index 00000000000..8d3dce3b380
--- /dev/null
+++ b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l05_cpuapp.overlay
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&wdt31 {
+	status = "okay";
+};
diff --git a/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l10_cpuapp.overlay b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l10_cpuapp.overlay
new file mode 100644
index 00000000000..8d3dce3b380
--- /dev/null
+++ b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l15dk_nrf54l10_cpuapp.overlay
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&wdt31 {
+	status = "okay";
+};
diff --git a/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
new file mode 100644
index 00000000000..8d3dce3b380
--- /dev/null
+++ b/tests/drivers/watchdog/wdt_error_cases/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&wdt31 {
+	status = "okay";
+};
diff --git a/tests/drivers/watchdog/wdt_error_cases/src/main.c b/tests/drivers/watchdog/wdt_error_cases/src/main.c
index 3182cdebd03..852729ce30a 100644
--- a/tests/drivers/watchdog/wdt_error_cases/src/main.c
+++ b/tests/drivers/watchdog/wdt_error_cases/src/main.c
@@ -43,7 +43,8 @@
 
 /* Align tests to the specific target: */
 #if defined(CONFIG_SOC_NRF54L05) || defined(CONFIG_SOC_NRF54L10) || \
-	defined(CONFIG_SOC_NRF54L15) || defined(CONFIG_SOC_NRF54H20) || defined(CONFIG_SOC_NRF9280)
+	defined(CONFIG_SOC_NRF54L15) || defined(CONFIG_SOC_NRF54L20) || \
+	defined(CONFIG_SOC_NRF54H20) || defined(CONFIG_SOC_NRF9280)
 #define WDT_TEST_FLAGS                                                                             \
 	(WDT_DISABLE_SUPPORTED | WDT_FLAG_RESET_SOC_SUPPORTED |                                    \
 	 WDT_FLAG_ONLY_ONE_TIMEOUT_VALUE_SUPPORTED | WDT_OPT_PAUSE_IN_SLEEP_SUPPORTED |            \
diff --git a/tests/drivers/watchdog/wdt_error_cases/testcase.yaml b/tests/drivers/watchdog/wdt_error_cases/testcase.yaml
index 3a3dbf94358..9326d751481 100644
--- a/tests/drivers/watchdog/wdt_error_cases/testcase.yaml
+++ b/tests/drivers/watchdog/wdt_error_cases/testcase.yaml
@@ -8,7 +8,10 @@ common:
 tests:
   drivers.watchdog.wdt_error_cases:
     platform_allow:
+      - nrf54l15dk/nrf54l05/cpuapp
+      - nrf54l15dk/nrf54l10/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
       - nrf54h20dk/nrf54h20/cpuapp
       - nrf54h20dk/nrf54h20/cpurad
       - nrf9280pdk/nrf9280/cpuapp