diff --git a/homeassistant/helpers/config_validation.py b/homeassistant/helpers/config_validation.py
index e00fa0d5c8a..ea8264dad78 100644
--- a/homeassistant/helpers/config_validation.py
+++ b/homeassistant/helpers/config_validation.py
@@ -1021,6 +1021,8 @@ def make_entity_service_schema(
         vol.All(
             vol.Schema(
                 {
+                    # The frontend stores data here. Don't use in core.
+                    vol.Remove("metadata"): dict,
                     **schema,
                     **ENTITY_SERVICE_FIELDS,
                 },
diff --git a/tests/helpers/test_config_validation.py b/tests/helpers/test_config_validation.py
index daa8d11d601..64c838e6c02 100644
--- a/tests/helpers/test_config_validation.py
+++ b/tests/helpers/test_config_validation.py
@@ -448,6 +448,32 @@ def test_entity_service_schema():
     for value in options:
         schema(value)
 
+    options = (
+        {
+            "required": 1,
+            "entity_id": "light.kitchen",
+            "metadata": {"some": "frontend_stuff"},
+        },
+    )
+    for value in options:
+        validated = schema(value)
+        assert "metadata" not in validated
+
+
+def test_entity_service_schema_with_metadata():
+    """Test make_entity_service_schema with overridden metadata key."""
+    schema = cv.make_entity_service_schema({vol.Required("metadata"): cv.positive_int})
+
+    options = ({"metadata": {"some": "frontend_stuff"}, "entity_id": "light.kitchen"},)
+    for value in options:
+        with pytest.raises(vol.MultipleInvalid):
+            cv.SERVICE_SCHEMA(value)
+
+    options = ({"metadata": 1, "entity_id": "light.kitchen"},)
+    for value in options:
+        validated = schema(value)
+        assert "metadata" in validated
+
 
 def test_slug():
     """Test slug validation."""