diff --git a/src/superio/nuvoton/Makefile.inc b/src/superio/nuvoton/Makefile.inc
index e9ac2e37f1..570102ad2a 100644
--- a/src/superio/nuvoton/Makefile.inc
+++ b/src/superio/nuvoton/Makefile.inc
@@ -8,6 +8,7 @@ subdirs-$(CONFIG_SUPERIO_NUVOTON_WPCM450) += wpcm450
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT5104D) += nct5104d
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT5539D) += nct5539d
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT5572D) += nct5572d
+subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT6687D) += nct6687d
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT6776) += nct6776
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT6779D) += nct6779d
 subdirs-$(CONFIG_SUPERIO_NUVOTON_NCT6791D) += nct6791d
diff --git a/src/superio/nuvoton/nct6687d/Kconfig b/src/superio/nuvoton/nct6687d/Kconfig
new file mode 100644
index 0000000000..fecd2fe275
--- /dev/null
+++ b/src/superio/nuvoton/nct6687d/Kconfig
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config SUPERIO_NUVOTON_NCT6687D
+	bool
+	select SUPERIO_NUVOTON_COMMON_PRE_RAM
diff --git a/src/superio/nuvoton/nct6687d/nct6687d.h b/src/superio/nuvoton/nct6687d/nct6687d.h
new file mode 100644
index 0000000000..a9652f7766
--- /dev/null
+++ b/src/superio/nuvoton/nct6687d/nct6687d.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/* Both NCT6687DD and NCT6687DF package variants are supported. */
+
+#ifndef SUPERIO_NUVOTON_NCT6687D_H
+#define SUPERIO_NUVOTON_NCT6687D_H
+
+/* Logical Device Numbers (LDN). */
+#define NCT6687D_PP		0x01 /* Parallel port */
+#define NCT6687D_SP1		0x02 /* Com1 */
+#define NCT6687D_SP2		0x03 /* Com2 & IR */
+#define NCT6687D_KBC		0x05 /* PS/2 keyboard and mouse */
+#define NCT6687D_CIR		0x06
+#define NCT6687D_GPIO_0_7	0x07 /* GPIO0 - GPIO7 */
+#define NCT6687D_P80_UART	0x08 /* Port 0x 80 UART*/
+#define NCT6687D_GPIO_8_9_AF	0x09 /* GPIO8 - GPIO9, GPIO1 - GPIO8 Alternate Function */
+#define NCT6687D_ACPI		0x0A
+#define NCT6687D_EC		0x0B /* EC space*/
+#define NCT6687D_RTC		0x0C
+#define NCT6687D_SLEEP_PWR	0x0D /* Deep Sleep, Power Fault */
+#define NCT6687D_TACH_PWM	0x0E /* TACHIN/PWMOUT Assignment */
+#define NCT6687D_FREG		0x0F /* Function Register */
+
+#endif /* SUPERIO_NUVOTON_NCT6687D_H */