diff --git a/homeassistant/components/mold_indicator/sensor.py b/homeassistant/components/mold_indicator/sensor.py
index de949ab72d8..eb4c0bf7284 100644
--- a/homeassistant/components/mold_indicator/sensor.py
+++ b/homeassistant/components/mold_indicator/sensor.py
@@ -20,6 +20,7 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     ATTR_UNIT_OF_MEASUREMENT,
     CONF_NAME,
+    CONF_UNIQUE_ID,
     PERCENTAGE,
     STATE_UNKNOWN,
     UnitOfTemperature,
@@ -64,6 +65,7 @@ PLATFORM_SCHEMA = SENSOR_PLATFORM_SCHEMA.extend(
         vol.Required(CONF_INDOOR_HUMIDITY): cv.entity_id,
         vol.Optional(CONF_CALIBRATION_FACTOR): vol.Coerce(float),
         vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+        vol.Optional(CONF_UNIQUE_ID): cv.string,
     }
 )
 
@@ -80,6 +82,7 @@ async def async_setup_platform(
     outdoor_temp_sensor: str = config[CONF_OUTDOOR_TEMP]
     indoor_humidity_sensor: str = config[CONF_INDOOR_HUMIDITY]
     calib_factor: float = config[CONF_CALIBRATION_FACTOR]
+    unique_id: str | None = config.get(CONF_UNIQUE_ID)
 
     async_add_entities(
         [
@@ -91,7 +94,7 @@ async def async_setup_platform(
                 outdoor_temp_sensor,
                 indoor_humidity_sensor,
                 calib_factor,
-                None,
+                unique_id,
             )
         ],
         False,