diff --git a/homeassistant/components/knx/binary_sensor.py b/homeassistant/components/knx/binary_sensor.py
index 7a3de7e1ec0..5ed0e55765d 100644
--- a/homeassistant/components/knx/binary_sensor.py
+++ b/homeassistant/components/knx/binary_sensor.py
@@ -9,6 +9,7 @@ from xknx.devices import BinarySensor as XknxBinarySensor
 from homeassistant.components.binary_sensor import BinarySensorEntity
 from homeassistant.const import (
     CONF_DEVICE_CLASS,
+    CONF_ENTITY_CATEGORY,
     CONF_NAME,
     STATE_ON,
     STATE_UNAVAILABLE,
@@ -64,6 +65,7 @@ class KNXBinarySensor(KnxEntity, BinarySensorEntity, RestoreEntity):
                 reset_after=config.get(BinarySensorSchema.CONF_RESET_AFTER),
             )
         )
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_device_class = config.get(CONF_DEVICE_CLASS)
         self._attr_force_update = self._device.ignore_internal_state
         self._attr_unique_id = str(self._device.remote_value.group_address_state)
diff --git a/homeassistant/components/knx/climate.py b/homeassistant/components/knx/climate.py
index 22289738711..2099270f036 100644
--- a/homeassistant/components/knx/climate.py
+++ b/homeassistant/components/knx/climate.py
@@ -17,7 +17,12 @@ from homeassistant.components.climate.const import (
     SUPPORT_PRESET_MODE,
     SUPPORT_TARGET_TEMPERATURE,
 )
-from homeassistant.const import ATTR_TEMPERATURE, CONF_NAME, TEMP_CELSIUS
+from homeassistant.const import (
+    ATTR_TEMPERATURE,
+    CONF_ENTITY_CATEGORY,
+    CONF_NAME,
+    TEMP_CELSIUS,
+)
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -176,6 +181,7 @@ class KNXClimate(KnxEntity, ClimateEntity):
     def __init__(self, xknx: XKNX, config: ConfigType) -> None:
         """Initialize of a KNX climate device."""
         super().__init__(_create_climate(xknx, config))
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_supported_features = SUPPORT_TARGET_TEMPERATURE
         if self.preset_modes:
             self._attr_supported_features |= SUPPORT_PRESET_MODE
diff --git a/homeassistant/components/knx/cover.py b/homeassistant/components/knx/cover.py
index 85cd6c9a60f..8eb906d1ba0 100644
--- a/homeassistant/components/knx/cover.py
+++ b/homeassistant/components/knx/cover.py
@@ -23,7 +23,7 @@ from homeassistant.components.cover import (
     SUPPORT_STOP_TILT,
     CoverEntity,
 )
-from homeassistant.const import CONF_DEVICE_CLASS, CONF_NAME
+from homeassistant.const import CONF_DEVICE_CLASS, CONF_ENTITY_CATEGORY, CONF_NAME
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -109,6 +109,7 @@ class KNXCover(KnxEntity, CoverEntity):
             )
         )
         self._unsubscribe_auto_updater: Callable[[], None] | None = None
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
 
         self._attr_device_class = config.get(CONF_DEVICE_CLASS) or (
             DEVICE_CLASS_BLIND if self._device.supports_angle else None
diff --git a/homeassistant/components/knx/fan.py b/homeassistant/components/knx/fan.py
index 21ede700fdd..a000cdec973 100644
--- a/homeassistant/components/knx/fan.py
+++ b/homeassistant/components/knx/fan.py
@@ -8,7 +8,7 @@ from xknx import XKNX
 from xknx.devices import Fan as XknxFan
 
 from homeassistant.components.fan import SUPPORT_OSCILLATE, SUPPORT_SET_SPEED, FanEntity
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_ENTITY_CATEGORY, CONF_NAME
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
@@ -65,6 +65,7 @@ class KNXFan(KnxEntity, FanEntity):
         )
         # FanSpeedMode.STEP if max_step is set
         self._step_range: tuple[int, int] | None = (1, max_step) if max_step else None
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
 
         self._attr_unique_id = str(self._device.speed.group_address)
 
diff --git a/homeassistant/components/knx/light.py b/homeassistant/components/knx/light.py
index b807ad1335d..bee96270c36 100644
--- a/homeassistant/components/knx/light.py
+++ b/homeassistant/components/knx/light.py
@@ -23,7 +23,7 @@ from homeassistant.components.light import (
     COLOR_MODE_XY,
     LightEntity,
 )
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_ENTITY_CATEGORY, CONF_NAME
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import entity_registry as er
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -242,6 +242,7 @@ class KNXLight(KnxEntity, LightEntity):
         self._attr_min_mireds = color_util.color_temperature_kelvin_to_mired(
             self._max_kelvin
         )
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = self._device_unique_id()
 
     def _device_unique_id(self) -> str:
diff --git a/homeassistant/components/knx/number.py b/homeassistant/components/knx/number.py
index c48c11fa998..2fc8e1af244 100644
--- a/homeassistant/components/knx/number.py
+++ b/homeassistant/components/knx/number.py
@@ -8,6 +8,7 @@ from xknx.devices import NumericValue
 
 from homeassistant.components.number import NumberEntity
 from homeassistant.const import (
+    CONF_ENTITY_CATEGORY,
     CONF_MODE,
     CONF_NAME,
     CONF_TYPE,
@@ -74,6 +75,7 @@ class KNXNumber(KnxEntity, NumberEntity, RestoreEntity):
             NumberSchema.CONF_STEP,
             self._device.sensor_value.dpt_class.resolution,
         )
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = str(self._device.sensor_value.group_address)
         self._attr_unit_of_measurement = self._device.unit_of_measurement()
         self._device.sensor_value.value = max(0, self._attr_min_value)
diff --git a/homeassistant/components/knx/scene.py b/homeassistant/components/knx/scene.py
index 9bd32c99e41..b09dc678be3 100644
--- a/homeassistant/components/knx/scene.py
+++ b/homeassistant/components/knx/scene.py
@@ -7,7 +7,7 @@ from xknx import XKNX
 from xknx.devices import Scene as XknxScene
 
 from homeassistant.components.scene import Scene
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_ENTITY_CATEGORY, CONF_NAME
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
@@ -49,6 +49,7 @@ class KNXScene(KnxEntity, Scene):
                 scene_number=config[SceneSchema.CONF_SCENE_NUMBER],
             )
         )
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = (
             f"{self._device.scene_value.group_address}_{self._device.scene_number}"
         )
diff --git a/homeassistant/components/knx/schema.py b/homeassistant/components/knx/schema.py
index 653084f3e3a..0e54a9abbc5 100644
--- a/homeassistant/components/knx/schema.py
+++ b/homeassistant/components/knx/schema.py
@@ -22,6 +22,7 @@ from homeassistant.components.number.const import MODE_AUTO, MODE_BOX, MODE_SLID
 from homeassistant.components.sensor import CONF_STATE_CLASS, STATE_CLASSES_SCHEMA
 from homeassistant.const import (
     CONF_DEVICE_CLASS,
+    CONF_ENTITY_CATEGORY,
     CONF_ENTITY_ID,
     CONF_HOST,
     CONF_MODE,
@@ -30,6 +31,7 @@ from homeassistant.const import (
     CONF_TYPE,
 )
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import ENTITY_CATEGORIES_SCHEMA
 
 from .const import (
     CONF_INVERT,
@@ -253,6 +255,7 @@ class BinarySensorSchema(KNXPlatformSchema):
                 ),
                 vol.Optional(CONF_DEVICE_CLASS): vol.In(BINARY_SENSOR_DEVICE_CLASSES),
                 vol.Optional(CONF_RESET_AFTER): cv.positive_float,
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
     )
@@ -371,6 +374,7 @@ class ClimateSchema(KNXPlatformSchema):
                 ): vol.In(HVAC_MODES),
                 vol.Optional(CONF_MIN_TEMP): vol.Coerce(float),
                 vol.Optional(CONF_MAX_TEMP): vol.Coerce(float),
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
     )
@@ -425,6 +429,7 @@ class CoverSchema(KNXPlatformSchema):
                 vol.Optional(CONF_INVERT_POSITION, default=False): cv.boolean,
                 vol.Optional(CONF_INVERT_ANGLE, default=False): cv.boolean,
                 vol.Optional(CONF_DEVICE_CLASS): vol.In(COVER_DEVICE_CLASSES),
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
     )
@@ -487,6 +492,7 @@ class FanSchema(KNXPlatformSchema):
             vol.Optional(CONF_OSCILLATION_ADDRESS): ga_list_validator,
             vol.Optional(CONF_OSCILLATION_STATE_ADDRESS): ga_list_validator,
             vol.Optional(CONF_MAX_STEP): cv.byte,
+            vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
         }
     )
 
@@ -590,6 +596,7 @@ class LightSchema(KNXPlatformSchema):
                 vol.Optional(CONF_MAX_KELVIN, default=DEFAULT_MAX_KELVIN): vol.All(
                     vol.Coerce(int), vol.Range(min=1)
                 ),
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
         vol.Any(
@@ -669,6 +676,7 @@ class NumberSchema(KNXPlatformSchema):
                 vol.Optional(CONF_MAX): vol.Coerce(float),
                 vol.Optional(CONF_MIN): vol.Coerce(float),
                 vol.Optional(CONF_STEP): cv.positive_float,
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
         number_limit_sub_validator,
@@ -690,6 +698,7 @@ class SceneSchema(KNXPlatformSchema):
             vol.Required(CONF_SCENE_NUMBER): vol.All(
                 vol.Coerce(int), vol.Range(min=1, max=64)
             ),
+            vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
         }
     )
 
@@ -722,6 +731,7 @@ class SelectSchema(KNXPlatformSchema):
                 ],
                 vol.Required(KNX_ADDRESS): ga_list_validator,
                 vol.Optional(CONF_STATE_ADDRESS): ga_list_validator,
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
         select_options_sub_validator,
@@ -746,6 +756,7 @@ class SensorSchema(KNXPlatformSchema):
             vol.Optional(CONF_STATE_CLASS): STATE_CLASSES_SCHEMA,
             vol.Required(CONF_TYPE): sensor_type_validator,
             vol.Required(CONF_STATE_ADDRESS): ga_list_validator,
+            vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
         }
     )
 
@@ -766,6 +777,7 @@ class SwitchSchema(KNXPlatformSchema):
             vol.Optional(CONF_RESPOND_TO_READ, default=False): cv.boolean,
             vol.Required(KNX_ADDRESS): ga_list_validator,
             vol.Optional(CONF_STATE_ADDRESS): ga_list_validator,
+            vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
         }
     )
 
@@ -812,6 +824,7 @@ class WeatherSchema(KNXPlatformSchema):
                 vol.Optional(CONF_KNX_DAY_NIGHT_ADDRESS): ga_list_validator,
                 vol.Optional(CONF_KNX_AIR_PRESSURE_ADDRESS): ga_list_validator,
                 vol.Optional(CONF_KNX_HUMIDITY_ADDRESS): ga_list_validator,
+                vol.Optional(CONF_ENTITY_CATEGORY): ENTITY_CATEGORIES_SCHEMA,
             }
         ),
     )
diff --git a/homeassistant/components/knx/select.py b/homeassistant/components/knx/select.py
index 90e0203a8be..e548ad27c8a 100644
--- a/homeassistant/components/knx/select.py
+++ b/homeassistant/components/knx/select.py
@@ -5,7 +5,12 @@ from xknx import XKNX
 from xknx.devices import Device as XknxDevice, RawValue
 
 from homeassistant.components.select import SelectEntity
-from homeassistant.const import CONF_NAME, STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import (
+    CONF_ENTITY_CATEGORY,
+    CONF_NAME,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
+)
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.restore_state import RestoreEntity
@@ -66,6 +71,7 @@ class KNXSelect(KnxEntity, SelectEntity, RestoreEntity):
         }
         self._attr_options = list(self._option_payloads)
         self._attr_current_option = None
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = str(self._device.remote_value.group_address)
 
     async def async_added_to_hass(self) -> None:
diff --git a/homeassistant/components/knx/sensor.py b/homeassistant/components/knx/sensor.py
index c1f68e4c376..fb64f65968b 100644
--- a/homeassistant/components/knx/sensor.py
+++ b/homeassistant/components/knx/sensor.py
@@ -11,7 +11,7 @@ from homeassistant.components.sensor import (
     DEVICE_CLASSES,
     SensorEntity,
 )
-from homeassistant.const import CONF_NAME, CONF_TYPE
+from homeassistant.const import CONF_ENTITY_CATEGORY, CONF_NAME, CONF_TYPE
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType, StateType
@@ -65,6 +65,7 @@ class KNXSensor(KnxEntity, SensorEntity):
             else None
         )
         self._attr_force_update = self._device.always_callback
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = str(self._device.sensor_value.group_address_state)
         self._attr_native_unit_of_measurement = self._device.unit_of_measurement()
         self._attr_state_class = config.get(CONF_STATE_CLASS)
diff --git a/homeassistant/components/knx/switch.py b/homeassistant/components/knx/switch.py
index cca0ffde853..c775ce70d32 100644
--- a/homeassistant/components/knx/switch.py
+++ b/homeassistant/components/knx/switch.py
@@ -7,7 +7,13 @@ from xknx import XKNX
 from xknx.devices import Switch as XknxSwitch
 
 from homeassistant.components.switch import SwitchEntity
-from homeassistant.const import CONF_NAME, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import (
+    CONF_ENTITY_CATEGORY,
+    CONF_NAME,
+    STATE_ON,
+    STATE_UNAVAILABLE,
+    STATE_UNKNOWN,
+)
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.restore_state import RestoreEntity
@@ -52,6 +58,7 @@ class KNXSwitch(KnxEntity, SwitchEntity, RestoreEntity):
                 invert=config[SwitchSchema.CONF_INVERT],
             )
         )
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = str(self._device.switch.group_address)
 
     async def async_added_to_hass(self) -> None:
diff --git a/homeassistant/components/knx/weather.py b/homeassistant/components/knx/weather.py
index 4a55f81ff72..13ebd2480e3 100644
--- a/homeassistant/components/knx/weather.py
+++ b/homeassistant/components/knx/weather.py
@@ -5,7 +5,7 @@ from xknx import XKNX
 from xknx.devices import Weather as XknxWeather
 
 from homeassistant.components.weather import WeatherEntity
-from homeassistant.const import CONF_NAME, TEMP_CELSIUS
+from homeassistant.const import CONF_ENTITY_CATEGORY, CONF_NAME, TEMP_CELSIUS
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
@@ -78,6 +78,7 @@ class KNXWeather(KnxEntity, WeatherEntity):
         """Initialize of a KNX sensor."""
         super().__init__(_create_weather(xknx, config))
         self._attr_unique_id = str(self._device._temperature.group_address_state)
+        self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
 
     @property
     def temperature(self) -> float | None:
diff --git a/tests/components/knx/test_binary_sensor.py b/tests/components/knx/test_binary_sensor.py
index 811c8ab1341..9adc7205543 100644
--- a/tests/components/knx/test_binary_sensor.py
+++ b/tests/components/knx/test_binary_sensor.py
@@ -4,8 +4,17 @@ from unittest.mock import patch
 
 from homeassistant.components.knx.const import CONF_STATE_ADDRESS, CONF_SYNC_STATE
 from homeassistant.components.knx.schema import BinarySensorSchema
-from homeassistant.const import CONF_NAME, STATE_OFF, STATE_ON
+from homeassistant.const import (
+    CONF_ENTITY_CATEGORY,
+    CONF_NAME,
+    ENTITY_CATEGORY_DIAGNOSTIC,
+    STATE_OFF,
+    STATE_ON,
+)
 from homeassistant.core import HomeAssistant, State
+from homeassistant.helpers.entity_registry import (
+    async_get_registry as async_get_entity_registry,
+)
 from homeassistant.util import dt
 
 from .conftest import KNXTestKit
@@ -13,6 +22,29 @@ from .conftest import KNXTestKit
 from tests.common import async_capture_events, async_fire_time_changed
 
 
+async def test_binary_sensor_entity_category(hass: HomeAssistant, knx: KNXTestKit):
+    """Test KNX binary sensor entity category."""
+    await knx.setup_integration(
+        {
+            BinarySensorSchema.PLATFORM_NAME: [
+                {
+                    CONF_NAME: "test_normal",
+                    CONF_STATE_ADDRESS: "1/1/1",
+                    CONF_ENTITY_CATEGORY: ENTITY_CATEGORY_DIAGNOSTIC,
+                },
+            ]
+        }
+    )
+    assert len(hass.states.async_all()) == 1
+
+    await knx.assert_read("1/1/1")
+    await knx.receive_response("1/1/1", True)
+
+    registry = await async_get_entity_registry(hass)
+    entity = registry.async_get("binary_sensor.test_normal")
+    assert entity.entity_category == ENTITY_CATEGORY_DIAGNOSTIC
+
+
 async def test_binary_sensor(hass: HomeAssistant, knx: KNXTestKit):
     """Test KNX binary sensor and inverted binary_sensor."""
     await knx.setup_integration(