diff --git a/variants/stm32/milesight_gs301/platformio.ini b/variants/stm32/milesight_gs301/platformio.ini
new file mode 100644
index 000000000..a1d3fb34e
--- /dev/null
+++ b/variants/stm32/milesight_gs301/platformio.ini
@@ -0,0 +1,21 @@
+; Milesight GS301 Bathroom Odor Detector
+; https://www.milesight.com/iot/product/lorawan-sensor/gs301
+[env:milesight_gs301]
+extends = stm32_base
+board = wiscore_rak3172 ; Convenient choice as the same USART is used for programming/debug
+board_level = extra
+board_upload.maximum_size = 233472 ; reserve the last 28KB for filesystem
+build_flags =
+  ${stm32_base.build_flags}
+  -Ivariants/stm32/milesight_gs301
+  -DPRIVATE_HW
+  -DMESHTASTIC_EXCLUDE_GPS=1
+  -DMESHTASTIC_EXCLUDE_I2C=1 # Analog ADuCM355 (unsupported) so no point building support for I2C in
+  -DMESHTASTIC_EXCLUDE_ENVIRONMENTAL_SENSOR=1
+  -DMESHTASTIC_EXCLUDE_AIR_QUALITY_SENSOR=1
+build_unflags =
+  -DDEBUG_MUTE # We have space for debug output until sensor support is added
+lib_deps =
+  ${stm32_base.lib_deps}
+
+upload_port = stlink
diff --git a/variants/stm32/milesight_gs301/rfswitch.h b/variants/stm32/milesight_gs301/rfswitch.h
new file mode 100644
index 000000000..d9f60038a
--- /dev/null
+++ b/variants/stm32/milesight_gs301/rfswitch.h
@@ -0,0 +1,7 @@
+// Seems to use the same RF switch pins as RAK3172… getting Tx/Rx SNR +11dB with a nearby node
+// PB8, PC13
+
+static const RADIOLIB_PIN_TYPE rfswitch_pins[5] = {PB8, PC13, RADIOLIB_NC, RADIOLIB_NC, RADIOLIB_NC};
+
+static const Module::RfSwitchMode_t rfswitch_table[4] = {
+    {STM32WLx::MODE_IDLE, {LOW, LOW}}, {STM32WLx::MODE_RX, {HIGH, LOW}}, {STM32WLx::MODE_TX_HP, {LOW, HIGH}}, END_OF_MODE_TABLE};
diff --git a/variants/stm32/milesight_gs301/variant.h b/variants/stm32/milesight_gs301/variant.h
new file mode 100644
index 000000000..e86e93fc4
--- /dev/null
+++ b/variants/stm32/milesight_gs301/variant.h
@@ -0,0 +1,41 @@
+#ifndef _VARIANT_MILESIGHT_GS301_
+#define _VARIANT_MILESIGHT_GS301_
+
+#define USE_STM32WLx
+
+// I/O
+#define LED_STATE_ON 1
+#define PIN_LED1 PA0 // Green LED
+#define LED_PIN PIN_LED1
+#define PIN_LED2 PA0 // Red LED
+#define USER_LED PIN_LED2
+#define BUTTON_PIN PC13
+#define BUTTON_ACTIVE_LOW true
+#define BUTTON_ACTIVE_PULLUP false
+#define PIN_BUZZER PA6
+
+// EC Sense DGM10 Double Gas Module
+// Analog ADuCM355 (unsupported); SHTC3 is connected to ADuCM355 and not directly accessible
+#define PIN_WIRE_SDA PB7
+#define PIN_WIRE_SCL PB8
+// Commented out to keep sensor powered down due to lack of support
+/*
+#define VEXT_ENABLE PB12 // TI TPS61291DRV VSEL - set LOW before ENable for Vout = 3.3V
+#define VEXT_ON_VALUE LOW
+#define SENSOR_POWER_CTRL_PIN PB2 // TI TPS61291DRV EN pin
+#define SENSOR_POWER_ON HIGH
+#define HAS_SENSOR 1
+*/
+
+#define ENABLE_HWSERIAL1
+#define PIN_SERIAL1_RX NC
+#define PIN_SERIAL1_TX PB6
+
+// LoRa
+#define SX126X_DIO3_TCXO_VOLTAGE 3.0
+
+// Required to avoid Serial1 conflicts due to board definition here:
+// https://github.com/stm32duino/Arduino_Core_STM32/blob/main/variants/STM32WLxx/WL54CCU_WL55CCU_WLE4C(8-B-C)U_WLE5C(8-B-C)U/variant_RAK3172_MODULE.h
+#define RAK3172
+
+#endif