diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index 986171cbee7..eabbbb49362 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -398,7 +398,7 @@ def _get_domains(hass: core.HomeAssistant, config: dict[str, Any]) -> set[str]:
         domains.update(hass.config_entries.async_domains())
 
     # Make sure the Hass.io component is loaded
-    if "HASSIO" in os.environ:
+    if "SUPERVISOR" in os.environ:
         domains.add("hassio")
 
     return domains
diff --git a/homeassistant/components/hassio/__init__.py b/homeassistant/components/hassio/__init__.py
index 93d902e4bae..cab17c94f0c 100644
--- a/homeassistant/components/hassio/__init__.py
+++ b/homeassistant/components/hassio/__init__.py
@@ -505,7 +505,7 @@ def get_supervisor_ip() -> str:
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:  # noqa: C901
     """Set up the Hass.io component."""
     # Check local setup
-    for env in ("HASSIO", "HASSIO_TOKEN"):
+    for env in ("SUPERVISOR", "SUPERVISOR_TOKEN"):
         if os.environ.get(env):
             continue
         _LOGGER.error("Missing %s environment variable", env)
@@ -517,7 +517,7 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:  # noqa:
 
     async_load_websocket_api(hass)
 
-    host = os.environ["HASSIO"]
+    host = os.environ["SUPERVISOR"]
     websession = async_get_clientsession(hass)
     hass.data[DOMAIN] = hassio = HassIO(hass.loop, websession, host)
 
diff --git a/homeassistant/components/hassio/auth.py b/homeassistant/components/hassio/auth.py
index 2d76a758096..f52a8ef0617 100644
--- a/homeassistant/components/hassio/auth.py
+++ b/homeassistant/components/hassio/auth.py
@@ -42,7 +42,7 @@ class HassIOBaseAuth(HomeAssistantView):
     def _check_access(self, request: web.Request):
         """Check if this call is from Supervisor."""
         # Check caller IP
-        hassio_ip = os.environ["HASSIO"].split(":")[0]
+        hassio_ip = os.environ["SUPERVISOR"].split(":")[0]
         if ip_address(request.transport.get_extra_info("peername")[0]) != ip_address(
             hassio_ip
         ):
diff --git a/homeassistant/components/hassio/handler.py b/homeassistant/components/hassio/handler.py
index 4146753b753..ba1b3bfaf35 100644
--- a/homeassistant/components/hassio/handler.py
+++ b/homeassistant/components/hassio/handler.py
@@ -246,7 +246,7 @@ class HassIO:
                 method,
                 f"http://{self._ip}{command}",
                 json=payload,
-                headers={X_HASSIO: os.environ.get("HASSIO_TOKEN", "")},
+                headers={X_HASSIO: os.environ.get("SUPERVISOR_TOKEN", "")},
                 timeout=aiohttp.ClientTimeout(total=timeout),
             )
 
diff --git a/homeassistant/components/hassio/http.py b/homeassistant/components/hassio/http.py
index 532b947ac49..63ac1521cc5 100644
--- a/homeassistant/components/hassio/http.py
+++ b/homeassistant/components/hassio/http.py
@@ -124,7 +124,7 @@ class HassIOView(HomeAssistantView):
 def _init_header(request: web.Request) -> dict[str, str]:
     """Create initial header."""
     headers = {
-        X_HASSIO: os.environ.get("HASSIO_TOKEN", ""),
+        X_HASSIO: os.environ.get("SUPERVISOR_TOKEN", ""),
         CONTENT_TYPE: request.content_type,
     }
 
diff --git a/homeassistant/components/hassio/ingress.py b/homeassistant/components/hassio/ingress.py
index 284ba42b3c1..c8b56e6f1bb 100644
--- a/homeassistant/components/hassio/ingress.py
+++ b/homeassistant/components/hassio/ingress.py
@@ -183,7 +183,7 @@ def _init_header(request: web.Request, token: str) -> CIMultiDict | dict[str, st
         headers[name] = value
 
     # Inject token / cleanup later on Supervisor
-    headers[X_HASSIO] = os.environ.get("HASSIO_TOKEN", "")
+    headers[X_HASSIO] = os.environ.get("SUPERVISOR_TOKEN", "")
 
     # Ingress information
     headers[X_INGRESS_PATH] = f"/api/hassio_ingress/{token}"
diff --git a/homeassistant/components/hassio/system_health.py b/homeassistant/components/hassio/system_health.py
index 1039a0237a8..b1fc208de80 100644
--- a/homeassistant/components/hassio/system_health.py
+++ b/homeassistant/components/hassio/system_health.py
@@ -6,8 +6,8 @@ from homeassistant.core import HomeAssistant, callback
 
 from . import get_host_info, get_info, get_os_info, get_supervisor_info
 
-SUPERVISOR_PING = f"http://{os.environ['HASSIO']}/supervisor/ping"
-OBSERVER_URL = f"http://{os.environ['HASSIO']}:4357"
+SUPERVISOR_PING = f"http://{os.environ['SUPERVISOR']}/supervisor/ping"
+OBSERVER_URL = f"http://{os.environ['SUPERVISOR']}:4357"
 
 
 @callback
diff --git a/tests/components/hassio/__init__.py b/tests/components/hassio/__init__.py
index 79520c6fd12..76aecd64098 100644
--- a/tests/components/hassio/__init__.py
+++ b/tests/components/hassio/__init__.py
@@ -1,2 +1,2 @@
 """Tests for Hass.io component."""
-HASSIO_TOKEN = "123456"
+SUPERVISOR_TOKEN = "123456"
diff --git a/tests/components/hassio/conftest.py b/tests/components/hassio/conftest.py
index 89a8c6f5c51..a6cd956c95e 100644
--- a/tests/components/hassio/conftest.py
+++ b/tests/components/hassio/conftest.py
@@ -9,16 +9,16 @@ from homeassistant.core import CoreState
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 from homeassistant.setup import async_setup_component
 
-from . import HASSIO_TOKEN
+from . import SUPERVISOR_TOKEN
 
 
 @pytest.fixture
 def hassio_env():
     """Fixture to inject hassio env."""
-    with patch.dict(os.environ, {"HASSIO": "127.0.0.1"}), patch(
+    with patch.dict(os.environ, {"SUPERVISOR": "127.0.0.1"}), patch(
         "homeassistant.components.hassio.HassIO.is_connected",
         return_value={"result": "ok", "data": {}},
-    ), patch.dict(os.environ, {"HASSIO_TOKEN": HASSIO_TOKEN}), patch(
+    ), patch.dict(os.environ, {"SUPERVISOR_TOKEN": SUPERVISOR_TOKEN}), patch(
         "homeassistant.components.hassio.HassIO.get_info",
         Mock(side_effect=HassioAPIError()),
     ):
@@ -75,5 +75,5 @@ def hassio_handler(hass, aioclient_mock):
 
     websession = hass.loop.run_until_complete(get_client_session())
 
-    with patch.dict(os.environ, {"HASSIO_TOKEN": HASSIO_TOKEN}):
+    with patch.dict(os.environ, {"SUPERVISOR_TOKEN": SUPERVISOR_TOKEN}):
         yield HassIO(hass.loop, websession, "127.0.0.1")
diff --git a/tests/components/hassio/test_binary_sensor.py b/tests/components/hassio/test_binary_sensor.py
index 0f4691e2795..ba9bcb2afdf 100644
--- a/tests/components/hassio/test_binary_sensor.py
+++ b/tests/components/hassio/test_binary_sensor.py
@@ -11,7 +11,7 @@ from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry
 
-MOCK_ENVIRON = {"HASSIO": "127.0.0.1", "HASSIO_TOKEN": "abcdefgh"}
+MOCK_ENVIRON = {"SUPERVISOR": "127.0.0.1", "SUPERVISOR_TOKEN": "abcdefgh"}
 
 
 @pytest.fixture(autouse=True)
diff --git a/tests/components/hassio/test_diagnostics.py b/tests/components/hassio/test_diagnostics.py
index 7bbc768681a..1f915e17e61 100644
--- a/tests/components/hassio/test_diagnostics.py
+++ b/tests/components/hassio/test_diagnostics.py
@@ -13,7 +13,7 @@ from homeassistant.setup import async_setup_component
 from tests.common import MockConfigEntry
 from tests.components.diagnostics import get_diagnostics_for_config_entry
 
-MOCK_ENVIRON = {"HASSIO": "127.0.0.1", "HASSIO_TOKEN": "abcdefgh"}
+MOCK_ENVIRON = {"SUPERVISOR": "127.0.0.1", "SUPERVISOR_TOKEN": "abcdefgh"}
 
 
 @pytest.fixture(autouse=True)
diff --git a/tests/components/hassio/test_init.py b/tests/components/hassio/test_init.py
index ff595aaa602..c47b3bfbeca 100644
--- a/tests/components/hassio/test_init.py
+++ b/tests/components/hassio/test_init.py
@@ -17,7 +17,7 @@ from homeassistant.util import dt as dt_util
 
 from tests.common import MockConfigEntry, async_fire_time_changed
 
-MOCK_ENVIRON = {"HASSIO": "127.0.0.1", "HASSIO_TOKEN": "abcdefgh"}
+MOCK_ENVIRON = {"SUPERVISOR": "127.0.0.1", "SUPERVISOR_TOKEN": "abcdefgh"}
 
 
 @pytest.fixture()
@@ -336,7 +336,7 @@ async def test_setup_core_push_timezone(hass, aioclient_mock):
 async def test_setup_hassio_no_additional_data(hass, aioclient_mock):
     """Test setup with API push default data."""
     with patch.dict(os.environ, MOCK_ENVIRON), patch.dict(
-        os.environ, {"HASSIO_TOKEN": "123456"}
+        os.environ, {"SUPERVISOR_TOKEN": "123456"}
     ):
         result = await async_setup_component(hass, "hassio", {"hassio": {}})
         assert result
diff --git a/tests/components/hassio/test_sensor.py b/tests/components/hassio/test_sensor.py
index 382d804eaac..868448cec2d 100644
--- a/tests/components/hassio/test_sensor.py
+++ b/tests/components/hassio/test_sensor.py
@@ -11,7 +11,7 @@ from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry
 
-MOCK_ENVIRON = {"HASSIO": "127.0.0.1", "HASSIO_TOKEN": "abcdefgh"}
+MOCK_ENVIRON = {"SUPERVISOR": "127.0.0.1", "SUPERVISOR_TOKEN": "abcdefgh"}
 
 
 @pytest.fixture(autouse=True)
diff --git a/tests/components/hassio/test_update.py b/tests/components/hassio/test_update.py
index 14d1d06ef38..48f6d894de0 100644
--- a/tests/components/hassio/test_update.py
+++ b/tests/components/hassio/test_update.py
@@ -12,7 +12,7 @@ from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry
 
-MOCK_ENVIRON = {"HASSIO": "127.0.0.1", "HASSIO_TOKEN": "abcdefgh"}
+MOCK_ENVIRON = {"SUPERVISOR": "127.0.0.1", "SUPERVISOR_TOKEN": "abcdefgh"}
 
 
 @pytest.fixture(autouse=True)
diff --git a/tests/components/http/test_ban.py b/tests/components/http/test_ban.py
index fbd545e0506..5e482d16248 100644
--- a/tests/components/http/test_ban.py
+++ b/tests/components/http/test_ban.py
@@ -33,10 +33,10 @@ BANNED_IPS_WITH_SUPERVISOR = BANNED_IPS + [SUPERVISOR_IP]
 @pytest.fixture(name="hassio_env")
 def hassio_env_fixture():
     """Fixture to inject hassio env."""
-    with patch.dict(os.environ, {"HASSIO": "127.0.0.1"}), patch(
+    with patch.dict(os.environ, {"SUPERVISOR": "127.0.0.1"}), patch(
         "homeassistant.components.hassio.HassIO.is_connected",
         return_value={"result": "ok", "data": {}},
-    ), patch.dict(os.environ, {"HASSIO_TOKEN": "123456"}):
+    ), patch.dict(os.environ, {"SUPERVISOR_TOKEN": "123456"}):
         yield
 
 
diff --git a/tests/components/onboarding/test_views.py b/tests/components/onboarding/test_views.py
index 025459e73b7..982f5b86e65 100644
--- a/tests/components/onboarding/test_views.py
+++ b/tests/components/onboarding/test_views.py
@@ -57,7 +57,7 @@ async def mock_supervisor_fixture(hass, aioclient_mock):
     """Mock supervisor."""
     aioclient_mock.post("http://127.0.0.1/homeassistant/options", json={"result": "ok"})
     aioclient_mock.post("http://127.0.0.1/supervisor/options", json={"result": "ok"})
-    with patch.dict(os.environ, {"HASSIO": "127.0.0.1"}), patch(
+    with patch.dict(os.environ, {"SUPERVISOR": "127.0.0.1"}), patch(
         "homeassistant.components.hassio.HassIO.is_connected",
         return_value=True,
     ), patch(
@@ -79,7 +79,7 @@ async def mock_supervisor_fixture(hass, aioclient_mock):
         "homeassistant.components.hassio.HassIO.get_ingress_panels",
         return_value={"panels": {}},
     ), patch.dict(
-        os.environ, {"HASSIO_TOKEN": "123456"}
+        os.environ, {"SUPERVISOR_TOKEN": "123456"}
     ):
         yield
 
diff --git a/tests/test_bootstrap.py b/tests/test_bootstrap.py
index c6c507a0f73..232d8fb6bbf 100644
--- a/tests/test_bootstrap.py
+++ b/tests/test_bootstrap.py
@@ -84,7 +84,7 @@ async def test_load_hassio(hass):
     with patch.dict(os.environ, {}, clear=True):
         assert bootstrap._get_domains(hass, {}) == set()
 
-    with patch.dict(os.environ, {"HASSIO": "1"}):
+    with patch.dict(os.environ, {"SUPERVISOR": "1"}):
         assert bootstrap._get_domains(hass, {}) == {"hassio"}