diff --git a/homeassistant/util/frozen_dataclass_compat.py b/homeassistant/util/frozen_dataclass_compat.py
index 58faedeea6f..456fc4f1570 100644
--- a/homeassistant/util/frozen_dataclass_compat.py
+++ b/homeassistant/util/frozen_dataclass_compat.py
@@ -117,4 +117,5 @@ class FrozenOrThawed(type):
                 return object.__new__(cls)
             return cls._dataclass(*_args, **kwargs)
 
+        cls.__init__ = cls._dataclass.__init__  # type: ignore[misc]
         cls.__new__ = __new__  # type: ignore[method-assign]
diff --git a/tests/helpers/snapshots/test_entity.ambr b/tests/helpers/snapshots/test_entity.ambr
index 7f146fa0494..1031134d2ad 100644
--- a/tests/helpers/snapshots/test_entity.ambr
+++ b/tests/helpers/snapshots/test_entity.ambr
@@ -36,6 +36,24 @@
 # name: test_extending_entity_description.1
   "test_extending_entity_description.<locals>.FrozenEntityDescription(key='blah', device_class=None, entity_category=None, entity_registry_enabled_default=True, entity_registry_visible_default=True, force_update=False, icon=None, has_entity_name=False, name='name', translation_key=None, unit_of_measurement=None, extra='foo')"
 # ---
+# name: test_extending_entity_description.10
+  dict({
+    'device_class': None,
+    'entity_category': None,
+    'entity_registry_enabled_default': True,
+    'entity_registry_visible_default': True,
+    'force_update': False,
+    'has_entity_name': False,
+    'icon': None,
+    'key': 'blah',
+    'name': 'name',
+    'translation_key': None,
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_extending_entity_description.11
+  "test_extending_entity_description.<locals>.CustomInitEntityDescription(key='blah', device_class=None, entity_category=None, entity_registry_enabled_default=True, entity_registry_visible_default=True, force_update=False, icon=None, has_entity_name=False, name='name', translation_key=None, unit_of_measurement=None)"
+# ---
 # name: test_extending_entity_description.2
   dict({
     'device_class': None,
diff --git a/tests/helpers/test_entity.py b/tests/helpers/test_entity.py
index 5a706b73b49..76577daf8a6 100644
--- a/tests/helpers/test_entity.py
+++ b/tests/helpers/test_entity.py
@@ -1749,3 +1749,15 @@ def test_extending_entity_description(snapshot: SnapshotAssertion):
         key="blah", extra="foo", mixin="mixin", name="name"
     )
     assert repr(obj) == snapshot
+
+    # Try inheriting with custom init
+    @dataclasses.dataclass
+    class CustomInitEntityDescription(entity.EntityDescription):
+        def __init__(self, extra, *args, **kwargs) -> None:
+            super().__init__(*args, **kwargs)
+            self.extra: str = extra
+
+    obj = CustomInitEntityDescription(key="blah", extra="foo", name="name")
+    assert obj == snapshot
+    assert obj == CustomInitEntityDescription(key="blah", extra="foo", name="name")
+    assert repr(obj) == snapshot