diff --git a/homeassistant/components/fritzbox/sensor.py b/homeassistant/components/fritzbox/sensor.py
index 0745ddc8331..6ffa8bc8560 100644
--- a/homeassistant/components/fritzbox/sensor.py
+++ b/homeassistant/components/fritzbox/sensor.py
@@ -21,6 +21,7 @@ from homeassistant.const import (
     DEVICE_CLASS_POWER,
     DEVICE_CLASS_TEMPERATURE,
     ENERGY_KILO_WATT_HOUR,
+    ENTITY_CATEGORY_DIAGNOSTIC,
     PERCENTAGE,
     POWER_WATT,
     TEMP_CELSIUS,
@@ -54,6 +55,7 @@ SENSOR_TYPES: Final[tuple[FritzSensorEntityDescription, ...]] = (
         native_unit_of_measurement=TEMP_CELSIUS,
         device_class=DEVICE_CLASS_TEMPERATURE,
         state_class=STATE_CLASS_MEASUREMENT,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
         suitable=lambda device: (
             device.has_temperature_sensor and not device.has_thermostat
         ),
@@ -73,6 +75,7 @@ SENSOR_TYPES: Final[tuple[FritzSensorEntityDescription, ...]] = (
         name="Battery",
         native_unit_of_measurement=PERCENTAGE,
         device_class=DEVICE_CLASS_BATTERY,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
         suitable=lambda device: device.battery_level is not None,
         native_value=lambda device: device.battery_level,  # type: ignore[no-any-return]
     ),