diff --git a/homeassistant/components/sonos/const.py b/homeassistant/components/sonos/const.py
index 4b636b3e0f6..523ac9f561b 100644
--- a/homeassistant/components/sonos/const.py
+++ b/homeassistant/components/sonos/const.py
@@ -144,6 +144,7 @@ PLAYABLE_MEDIA_TYPES = [
 
 SONOS_CHECK_ACTIVITY = "sonos_check_activity"
 SONOS_CREATE_ALARM = "sonos_create_alarm"
+SONOS_CREATE_AUDIO_FORMAT_SENSOR = "sonos_create_audio_format_sensor"
 SONOS_CREATE_BATTERY = "sonos_create_battery"
 SONOS_CREATE_SWITCHES = "sonos_create_switches"
 SONOS_CREATE_LEVELS = "sonos_create_levels"
diff --git a/homeassistant/components/sonos/sensor.py b/homeassistant/components/sonos/sensor.py
index 599e5434fb4..7c9235cf4af 100644
--- a/homeassistant/components/sonos/sensor.py
+++ b/homeassistant/components/sonos/sensor.py
@@ -7,9 +7,10 @@ from homeassistant.const import (
     ENTITY_CATEGORY_DIAGNOSTIC,
     PERCENTAGE,
 )
+from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
-from .const import SONOS_CREATE_BATTERY
+from .const import SONOS_CREATE_AUDIO_FORMAT_SENSOR, SONOS_CREATE_BATTERY
 from .entity import SonosEntity
 from .speaker import SonosSpeaker
 
@@ -17,12 +18,27 @@ from .speaker import SonosSpeaker
 async def async_setup_entry(hass, config_entry, async_add_entities):
     """Set up Sonos from a config entry."""
 
-    async def _async_create_entity(speaker: SonosSpeaker) -> None:
+    @callback
+    def _async_create_audio_format_entity(
+        speaker: SonosSpeaker, audio_format: str
+    ) -> None:
+        entity = SonosAudioInputFormatSensorEntity(speaker, audio_format)
+        async_add_entities([entity])
+
+    @callback
+    def _async_create_battery_sensor(speaker: SonosSpeaker) -> None:
         entity = SonosBatteryEntity(speaker)
         async_add_entities([entity])
 
     config_entry.async_on_unload(
-        async_dispatcher_connect(hass, SONOS_CREATE_BATTERY, _async_create_entity)
+        async_dispatcher_connect(
+            hass, SONOS_CREATE_AUDIO_FORMAT_SENSOR, _async_create_audio_format_entity
+        )
+    )
+    config_entry.async_on_unload(
+        async_dispatcher_connect(
+            hass, SONOS_CREATE_BATTERY, _async_create_battery_sensor
+        )
     )
 
 
@@ -64,3 +80,25 @@ class SonosBatteryEntity(SonosEntity, SensorEntity):
     def available(self) -> bool:
         """Return whether this device is available."""
         return self.speaker.available and self.speaker.power_source
+
+
+class SonosAudioInputFormatSensorEntity(SonosEntity, SensorEntity):
+    """Representation of a Sonos audio import format sensor entity."""
+
+    _attr_entity_category = ENTITY_CATEGORY_DIAGNOSTIC
+    _attr_icon = "mdi:import"
+    _attr_should_poll = True
+
+    def __init__(self, speaker: SonosSpeaker, audio_format: str) -> None:
+        """Initialize the audio input format sensor."""
+        super().__init__(speaker)
+        self._attr_unique_id = f"{self.soco.uid}-audio-format"
+        self._attr_name = f"{self.speaker.zone_name} Audio Input Format"
+        self._attr_native_value = audio_format
+
+    def update(self) -> None:
+        """Poll the device for the current state."""
+        self._attr_native_value = self.soco.soundbar_audio_input_format
+
+    async def _async_poll(self) -> None:
+        """Provide a stub for required ABC method."""
diff --git a/homeassistant/components/sonos/speaker.py b/homeassistant/components/sonos/speaker.py
index 4838da69c50..05787a354f0 100644
--- a/homeassistant/components/sonos/speaker.py
+++ b/homeassistant/components/sonos/speaker.py
@@ -46,6 +46,7 @@ from .const import (
     SCAN_INTERVAL,
     SONOS_CHECK_ACTIVITY,
     SONOS_CREATE_ALARM,
+    SONOS_CREATE_AUDIO_FORMAT_SENSOR,
     SONOS_CREATE_BATTERY,
     SONOS_CREATE_LEVELS,
     SONOS_CREATE_MEDIA_PLAYER,
@@ -240,6 +241,11 @@ class SonosSpeaker:
 
         dispatcher_send(self.hass, SONOS_CREATE_LEVELS, self)
 
+        if audio_format := self.soco.soundbar_audio_input_format:
+            dispatcher_send(
+                self.hass, SONOS_CREATE_AUDIO_FORMAT_SENSOR, self, audio_format
+            )
+
         if battery_info := fetch_battery_info_or_none(self.soco):
             self.battery_info = battery_info
             # Battery events can be infrequent, polling is still necessary
diff --git a/tests/components/sonos/conftest.py b/tests/components/sonos/conftest.py
index a17f07c3c35..f7f8d67589f 100644
--- a/tests/components/sonos/conftest.py
+++ b/tests/components/sonos/conftest.py
@@ -74,6 +74,7 @@ def soco_fixture(music_library, speaker_info, battery_info, alarm_clock):
         mock_soco.treble = -1
         mock_soco.sub_enabled = False
         mock_soco.surround_enabled = True
+        mock_soco.soundbar_audio_input_format = "Dolby 5.1"
         mock_soco.get_battery_info.return_value = battery_info
         mock_soco.all_zones = [mock_soco]
         yield mock_soco
diff --git a/tests/components/sonos/test_sensor.py b/tests/components/sonos/test_sensor.py
index 18cd87ca9be..a45d587cc08 100644
--- a/tests/components/sonos/test_sensor.py
+++ b/tests/components/sonos/test_sensor.py
@@ -123,3 +123,14 @@ async def test_device_payload_without_battery_and_ignored_keys(
     await hass.async_block_till_done()
 
     assert ignored_payload not in caplog.text
+
+
+async def test_audio_input_sensor(hass, config_entry, config, soco):
+    """Test sonos device with battery state."""
+    await setup_platform(hass, config_entry, config)
+
+    entity_registry = await hass.helpers.entity_registry.async_get_registry()
+
+    audio_input_sensor = entity_registry.entities["sensor.zone_a_audio_input_format"]
+    audio_input_state = hass.states.get(audio_input_sensor.entity_id)
+    assert audio_input_state.state == "Dolby 5.1"