diff --git a/homeassistant/components/knx/climate.py b/homeassistant/components/knx/climate.py
index b8c07767005..298ae391fe4 100644
--- a/homeassistant/components/knx/climate.py
+++ b/homeassistant/components/knx/climate.py
@@ -10,6 +10,8 @@ from xknx.telegram.address import parse_device_group_address
 
 from homeassistant.components.climate import ClimateEntity
 from homeassistant.components.climate.const import (
+    CURRENT_HVAC_IDLE,
+    CURRENT_HVAC_OFF,
     HVAC_MODE_HEAT,
     HVAC_MODE_OFF,
     PRESET_AWAY,
@@ -22,7 +24,7 @@ from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
-from .const import CONTROLLER_MODES, DOMAIN, PRESET_MODES
+from .const import CONTROLLER_MODES, CURRENT_HVAC_ACTIONS, DOMAIN, PRESET_MODES
 from .knx_entity import KnxEntity
 from .schema import ClimateSchema
 
@@ -260,6 +262,20 @@ class KNXClimate(KnxEntity, ClimateEntity):
         # default to ["heat"]
         return hvac_modes if hvac_modes else [HVAC_MODE_HEAT]
 
+    @property
+    def hvac_action(self) -> str | None:
+        """Return the current running hvac operation if supported.
+
+        Need to be one of CURRENT_HVAC_*.
+        """
+        if self._device.supports_on_off and not self._device.is_on:
+            return CURRENT_HVAC_OFF
+        if self._device.mode is not None and self._device.mode.supports_controller_mode:
+            return CURRENT_HVAC_ACTIONS.get(
+                self._device.mode.controller_mode.value, CURRENT_HVAC_IDLE
+            )
+        return None
+
     async def async_set_hvac_mode(self, hvac_mode: str) -> None:
         """Set operation mode."""
         if self._device.supports_on_off and hvac_mode == HVAC_MODE_OFF:
diff --git a/homeassistant/components/knx/const.py b/homeassistant/components/knx/const.py
index 4935cbd09d4..74c6045b767 100644
--- a/homeassistant/components/knx/const.py
+++ b/homeassistant/components/knx/const.py
@@ -3,6 +3,11 @@ from enum import Enum
 from typing import Final
 
 from homeassistant.components.climate.const import (
+    CURRENT_HVAC_COOL,
+    CURRENT_HVAC_DRY,
+    CURRENT_HVAC_FAN,
+    CURRENT_HVAC_HEAT,
+    CURRENT_HVAC_OFF,
     HVAC_MODE_AUTO,
     HVAC_MODE_COOL,
     HVAC_MODE_DRY,
@@ -68,6 +73,14 @@ CONTROLLER_MODES: Final = {
     "Dry": HVAC_MODE_DRY,
 }
 
+CURRENT_HVAC_ACTIONS: Final = {
+    "Heat": CURRENT_HVAC_HEAT,
+    "Cool": CURRENT_HVAC_COOL,
+    "Off": CURRENT_HVAC_OFF,
+    "Fan only": CURRENT_HVAC_FAN,
+    "Dry": CURRENT_HVAC_DRY,
+}
+
 PRESET_MODES: Final = {
     # Map DPT 20.102 HVAC operating modes to HA presets
     "Auto": PRESET_NONE,