diff --git a/homeassistant/components/sun/sensor.py b/homeassistant/components/sun/sensor.py
index 8a390ea2a27..344e0c2179e 100644
--- a/homeassistant/components/sun/sensor.py
+++ b/homeassistant/components/sun/sensor.py
@@ -13,7 +13,7 @@ from homeassistant.components.sensor import (
     SensorStateClass,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import DEGREE
+from homeassistant.const import DEGREE, EntityCategory
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.device_registry import DeviceEntryType
 from homeassistant.helpers.entity import DeviceInfo
@@ -118,6 +118,7 @@ class SunSensor(SensorEntity):
     """Representation of a Sun Sensor."""
 
     _attr_has_entity_name = True
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
     entity_description: SunSensorEntityDescription
 
     def __init__(
diff --git a/tests/components/sun/test_sensor.py b/tests/components/sun/test_sensor.py
index 13f4fd0d62b..38453569269 100644
--- a/tests/components/sun/test_sensor.py
+++ b/tests/components/sun/test_sensor.py
@@ -6,6 +6,7 @@ import astral.sun
 from freezegun import freeze_time
 
 from homeassistant.components import sun
+from homeassistant.const import EntityCategory
 from homeassistant.core import HomeAssistant
 import homeassistant.helpers.entity_registry as er
 from homeassistant.setup import async_setup_component
@@ -98,4 +99,6 @@ async def test_setting_rising(hass: HomeAssistant) -> None:
     entity_reg = er.async_get(hass)
     entity = entity_reg.async_get("sensor.sun_next_dawn")
 
+    assert entity
+    assert entity.entity_category is EntityCategory.DIAGNOSTIC
     assert entity.unique_id == f"{entry_ids[0].entry_id}-next_dawn"