diff --git a/homeassistant/components/demo/humidifier.py b/homeassistant/components/demo/humidifier.py
index 772726ac1d5..75c2cf3120a 100644
--- a/homeassistant/components/demo/humidifier.py
+++ b/homeassistant/components/demo/humidifier.py
@@ -29,12 +29,14 @@ async def async_setup_platform(
                 name="Humidifier",
                 mode=None,
                 target_humidity=68,
+                current_humidity=45,
                 device_class=HumidifierDeviceClass.HUMIDIFIER,
             ),
             DemoHumidifier(
                 name="Dehumidifier",
                 mode=None,
                 target_humidity=54,
+                current_humidity=59,
                 device_class=HumidifierDeviceClass.DEHUMIDIFIER,
             ),
             DemoHumidifier(
@@ -66,6 +68,7 @@ class DemoHumidifier(HumidifierEntity):
         name: str,
         mode: str | None,
         target_humidity: int,
+        current_humidity: int | None = None,
         available_modes: list[str] | None = None,
         is_on: bool = True,
         device_class: HumidifierDeviceClass | None = None,
@@ -77,6 +80,7 @@ class DemoHumidifier(HumidifierEntity):
         if mode is not None:
             self._attr_supported_features |= HumidifierEntityFeature.MODES
         self._attr_target_humidity = target_humidity
+        self._attr_current_humidity = current_humidity
         self._attr_mode = mode
         self._attr_available_modes = available_modes
         self._attr_device_class = device_class
diff --git a/homeassistant/components/humidifier/__init__.py b/homeassistant/components/humidifier/__init__.py
index 0bc7e242d55..49c3f4681a8 100644
--- a/homeassistant/components/humidifier/__init__.py
+++ b/homeassistant/components/humidifier/__init__.py
@@ -30,6 +30,7 @@ from homeassistant.loader import bind_hass
 
 from .const import (  # noqa: F401
     ATTR_AVAILABLE_MODES,
+    ATTR_CURRENT_HUMIDITY,
     ATTR_HUMIDITY,
     ATTR_MAX_HUMIDITY,
     ATTR_MIN_HUMIDITY,
@@ -133,6 +134,7 @@ class HumidifierEntity(ToggleEntity):
 
     entity_description: HumidifierEntityDescription
     _attr_available_modes: list[str] | None
+    _attr_current_humidity: int | None = None
     _attr_device_class: HumidifierDeviceClass | None
     _attr_max_humidity: int = DEFAULT_MAX_HUMIDITY
     _attr_min_humidity: int = DEFAULT_MIN_HUMIDITY
@@ -168,6 +170,9 @@ class HumidifierEntity(ToggleEntity):
         """Return the optional state attributes."""
         data: dict[str, int | str | None] = {}
 
+        if self.current_humidity is not None:
+            data[ATTR_CURRENT_HUMIDITY] = self.current_humidity
+
         if self.target_humidity is not None:
             data[ATTR_HUMIDITY] = self.target_humidity
 
@@ -176,6 +181,11 @@ class HumidifierEntity(ToggleEntity):
 
         return data
 
+    @property
+    def current_humidity(self) -> int | None:
+        """Return the current humidity."""
+        return self._attr_current_humidity
+
     @property
     def target_humidity(self) -> int | None:
         """Return the humidity we try to reach."""
diff --git a/homeassistant/components/humidifier/const.py b/homeassistant/components/humidifier/const.py
index 1f802f7fa36..27e181fe63c 100644
--- a/homeassistant/components/humidifier/const.py
+++ b/homeassistant/components/humidifier/const.py
@@ -12,6 +12,7 @@ MODE_AUTO = "auto"
 MODE_BABY = "baby"
 
 ATTR_AVAILABLE_MODES = "available_modes"
+ATTR_CURRENT_HUMIDITY = "current_humidity"
 ATTR_HUMIDITY = "humidity"
 ATTR_MAX_HUMIDITY = "max_humidity"
 ATTR_MIN_HUMIDITY = "min_humidity"
diff --git a/homeassistant/components/humidifier/strings.json b/homeassistant/components/humidifier/strings.json
index 015b3c08e9a..e4f5961a3cf 100644
--- a/homeassistant/components/humidifier/strings.json
+++ b/homeassistant/components/humidifier/strings.json
@@ -31,6 +31,9 @@
         "available_modes": {
           "name": "Available modes"
         },
+        "current_humidity": {
+          "name": "Current humidity"
+        },
         "humidity": {
           "name": "Target humidity"
         },
diff --git a/tests/components/demo/test_humidifier.py b/tests/components/demo/test_humidifier.py
index d0b1e15ea61..501362d6533 100644
--- a/tests/components/demo/test_humidifier.py
+++ b/tests/components/demo/test_humidifier.py
@@ -4,6 +4,7 @@ import pytest
 import voluptuous as vol
 
 from homeassistant.components.humidifier import (
+    ATTR_CURRENT_HUMIDITY,
     ATTR_HUMIDITY,
     ATTR_MAX_HUMIDITY,
     ATTR_MIN_HUMIDITY,
@@ -43,6 +44,7 @@ def test_setup_params(hass: HomeAssistant) -> None:
     state = hass.states.get(ENTITY_DEHUMIDIFIER)
     assert state.state == STATE_ON
     assert state.attributes.get(ATTR_HUMIDITY) == 54
+    assert state.attributes.get(ATTR_CURRENT_HUMIDITY) == 59
 
 
 def test_default_setup_params(hass: HomeAssistant) -> None: