diff --git a/homeassistant/components/sonos/number.py b/homeassistant/components/sonos/number.py
index dc0958f6190..8a9b8e9af70 100644
--- a/homeassistant/components/sonos/number.py
+++ b/homeassistant/components/sonos/number.py
@@ -19,6 +19,7 @@ from .speaker import SonosSpeaker
 LEVEL_TYPES = {
     "audio_delay": (0, 5),
     "bass": (-10, 10),
+    "balance": (-100, 100),
     "treble": (-10, 10),
     "sub_gain": (-15, 15),
     "surround_level": (-15, 15),
@@ -30,6 +31,40 @@ SocoFeatures = list[tuple[str, tuple[int, int]]]
 _LOGGER = logging.getLogger(__name__)
 
 
+def _balance_to_number(state: tuple[int, int]) -> float:
+    """Represent a balance measure returned by SoCo as a number.
+
+    SoCo returns a pair of volumes, one for the left side and one
+    for the right side. When the two are equal, sound is centered;
+    HA will show that as 0. When the left side is louder, HA will
+    show a negative value, and a positive value means the right
+    side is louder. Maximum absolute value is 100, which means only
+    one side produces sound at all.
+    """
+    left, right = state
+    return (right - left) * 100 // max(right, left)
+
+
+def _balance_from_number(value: float) -> tuple[int, int]:
+    """Convert a balance value from -100 to 100 into SoCo format.
+
+    0 becomes (100, 100), fully enabling both sides. Note that
+    the master volume control is separate, so this does not
+    turn up the speakers to maximum volume. Negative values
+    reduce the volume of the right side, and positive values
+    reduce the volume of the left side. -100 becomes (100, 0),
+    fully muting the right side, and +100 becomes (0, 100),
+    muting the left side.
+    """
+    left = min(100, 100 - int(value))
+    right = min(100, int(value) + 100)
+    return left, right
+
+
+LEVEL_TO_NUMBER = {"balance": _balance_to_number}
+LEVEL_FROM_NUMBER = {"balance": _balance_from_number}
+
+
 async def async_setup_entry(
     hass: HomeAssistant,
     config_entry: ConfigEntry,
@@ -92,9 +127,11 @@ class SonosLevelEntity(SonosEntity, NumberEntity):
     @soco_error()
     def set_native_value(self, value: float) -> None:
         """Set a new value."""
-        setattr(self.soco, self.level_type, value)
+        from_number = LEVEL_FROM_NUMBER.get(self.level_type, int)
+        setattr(self.soco, self.level_type, from_number(value))
 
     @property
     def native_value(self) -> float:
         """Return the current value."""
-        return cast(float, getattr(self.speaker, self.level_type))
+        to_number = LEVEL_TO_NUMBER.get(self.level_type, int)
+        return cast(float, to_number(getattr(self.speaker, self.level_type)))
diff --git a/homeassistant/components/sonos/speaker.py b/homeassistant/components/sonos/speaker.py
index 25ba9c86d1f..e576d3f7908 100644
--- a/homeassistant/components/sonos/speaker.py
+++ b/homeassistant/components/sonos/speaker.py
@@ -145,6 +145,7 @@ class SonosSpeaker:
         self.volume: int | None = None
         self.muted: bool | None = None
         self.cross_fade: bool | None = None
+        self.balance: tuple[int, int] | None = None
         self.bass: int | None = None
         self.treble: int | None = None
         self.loudness: bool | None = None
@@ -536,7 +537,10 @@ class SonosSpeaker:
         variables = event.variables
 
         if "volume" in variables:
-            self.volume = int(variables["volume"]["Master"])
+            volume = variables["volume"]
+            self.volume = int(volume["Master"])
+            if "LF" in volume and "RF" in volume:
+                self.balance = (int(volume["LF"]), int(volume["RF"]))
 
         if "mute" in variables:
             self.muted = variables["mute"]["Master"] == "1"
diff --git a/tests/components/sonos/conftest.py b/tests/components/sonos/conftest.py
index ef420c11ef2..4e01ba02edd 100644
--- a/tests/components/sonos/conftest.py
+++ b/tests/components/sonos/conftest.py
@@ -112,6 +112,7 @@ def soco_fixture(
         mock_soco.loudness = True
         mock_soco.volume = 19
         mock_soco.audio_delay = 2
+        mock_soco.balance = (61, 100)
         mock_soco.bass = 1
         mock_soco.treble = -1
         mock_soco.mic_enabled = False
diff --git a/tests/components/sonos/test_number.py b/tests/components/sonos/test_number.py
index a393f699a57..d5da2af629e 100644
--- a/tests/components/sonos/test_number.py
+++ b/tests/components/sonos/test_number.py
@@ -11,6 +11,10 @@ async def test_number_entities(
     hass: HomeAssistant, async_autosetup_sonos, soco, entity_registry: er.EntityRegistry
 ) -> None:
     """Test number entities."""
+    balance_number = entity_registry.entities["number.zone_a_balance"]
+    balance_state = hass.states.get(balance_number.entity_id)
+    assert balance_state.state == "39"
+
     bass_number = entity_registry.entities["number.zone_a_bass"]
     bass_state = hass.states.get(bass_number.entity_id)
     assert bass_state.state == "1"