diff --git a/dts/arm/nuvoton/m2l31x.dtsi b/dts/arm/nuvoton/m2l31x.dtsi
index 1dd45305500..a0f51195453 100644
--- a/dts/arm/nuvoton/m2l31x.dtsi
+++ b/dts/arm/nuvoton/m2l31x.dtsi
@@ -48,6 +48,7 @@
 			clk-pclkdiv = <(NUMAKER_CLK_PCLKDIV_APB0DIV_DIV2 |
 					NUMAKER_CLK_PCLKDIV_APB1DIV_DIV2)>;
 			core-clock = <DT_FREQ_M(72)>;
+			powerdown-mode = <NUMAKER_CLK_PMUCTL_PDMSEL_DPD0>;
 
 			pcc: peripheral-clock-controller {
 				compatible = "nuvoton,numaker-pcc";
diff --git a/include/zephyr/dt-bindings/clock/numaker_m2l31x_clock.h b/include/zephyr/dt-bindings/clock/numaker_m2l31x_clock.h
index fab7f656e4f..85f411cfad9 100644
--- a/include/zephyr/dt-bindings/clock/numaker_m2l31x_clock.h
+++ b/include/zephyr/dt-bindings/clock/numaker_m2l31x_clock.h
@@ -271,4 +271,17 @@
 #define NUMAKER_LPADC0_MODULE 0xB5431218
 #define NUMAKER_OPA_MODULE 0xA000001B
 
+#define NUMAKER_CLK_PMUCTL_PDMSEL_PD 0x00000000
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD0 0x00000000
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD1 0x00000001
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD2 0x00000002
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD3 0x00000003
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD4 0x00000004
+#define NUMAKER_CLK_PMUCTL_PDMSEL_NPD5 0x00000005
+#define NUMAKER_CLK_PMUCTL_PDMSEL_SPD0 0x00000008
+#define NUMAKER_CLK_PMUCTL_PDMSEL_SPD1 0x00000009
+#define NUMAKER_CLK_PMUCTL_PDMSEL_SPD2 0x0000000A
+#define NUMAKER_CLK_PMUCTL_PDMSEL_DPD0 0x0000000C
+#define NUMAKER_CLK_PMUCTL_PDMSEL_DPD1 0x0000000D
+
 #endif
diff --git a/soc/nuvoton/numaker/m2l31x/CMakeLists.txt b/soc/nuvoton/numaker/m2l31x/CMakeLists.txt
index c1295bf59ad..6466b0b75e1 100644
--- a/soc/nuvoton/numaker/m2l31x/CMakeLists.txt
+++ b/soc/nuvoton/numaker/m2l31x/CMakeLists.txt
@@ -6,4 +6,6 @@ zephyr_sources(soc.c)
 
 zephyr_include_directories(.)
 
+zephyr_library_sources_ifdef(CONFIG_POWEROFF poweroff.c)
+
 set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/arm/cortex_m/scripts/linker.ld CACHE INTERNAL "")
diff --git a/soc/nuvoton/numaker/m2l31x/Kconfig b/soc/nuvoton/numaker/m2l31x/Kconfig
index 58d30415e12..350913a3435 100644
--- a/soc/nuvoton/numaker/m2l31x/Kconfig
+++ b/soc/nuvoton/numaker/m2l31x/Kconfig
@@ -8,6 +8,7 @@ config SOC_SERIES_M2L31X
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select CPU_CORTEX_M_HAS_VTOR
 	select CPU_HAS_ARM_MPU
+	select HAS_POWEROFF
 
 config SOC_M2L31XXX
 	select HAS_NUMAKER_HAL
diff --git a/soc/nuvoton/numaker/m2l31x/poweroff.c b/soc/nuvoton/numaker/m2l31x/poweroff.c
new file mode 100644
index 00000000000..94233822154
--- /dev/null
+++ b/soc/nuvoton/numaker/m2l31x/poweroff.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2024 Nuvoton Technology Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/sys/poweroff.h>
+#include <NuMicro.h>
+
+void z_sys_poweroff(void)
+{
+	SYS_UnlockReg();
+
+	/* Clear all wake-up flag */
+	CLK->PMUSTS |= CLK_PMUSTS_CLRWK_Msk;
+
+	/* Select Power-down mode */
+	CLK_SetPowerDownMode(DT_PROP_OR(DT_NODELABEL(scc), powerdown_mode, CLK_PMUCTL_PDMSEL_SPD0));
+
+	/* Enable RTC wake-up */
+	CLK_ENABLE_RTCWK();
+
+	/* Enter to Power-down mode */
+	CLK_PowerDown();
+
+	k_cpu_idle();
+
+	CODE_UNREACHABLE;
+}
diff --git a/soc/nuvoton/numaker/m2l31x/soc.c b/soc/nuvoton/numaker/m2l31x/soc.c
index e766b27cda9..f3274504bb2 100644
--- a/soc/nuvoton/numaker/m2l31x/soc.c
+++ b/soc/nuvoton/numaker/m2l31x/soc.c
@@ -16,6 +16,9 @@ void z_arm_platform_init(void)
 	/* Unlock protected registers */
 	SYS_UnlockReg();
 
+	/* Release I/O hold status */
+	CLK->IOPDCTL = 1;
+
 	/*
 	 * -------------------
 	 * Init System Clock