diff --git a/Lib/test/test_warnings/__init__.py b/Lib/test/test_warnings/__init__.py
index 4bd164b8a9a82b..c842c2c6f262dd 100644
--- a/Lib/test/test_warnings/__init__.py
+++ b/Lib/test/test_warnings/__init__.py
@@ -1,4 +1,4 @@
-from contextlib import contextmanager
+from contextlib import contextmanager, redirect_stdout
 import linecache
 import os
 import importlib
@@ -1821,6 +1821,15 @@ async def coro(self):
         self.assertFalse(inspect.iscoroutinefunction(Cls.sync))
         self.assertTrue(inspect.iscoroutinefunction(Cls.coro))
 
+    def test_deprecated_class(self):
+        with self.assertWarns(DeprecationWarning) as cm:
+            f = StringIO()
+            with redirect_stdout(f):
+                import test.test_warnings.data.deprecated_class as test_module
+                help(test_module)
+            self.assertIn(f"Help on module {test_module.__name__}", f.getvalue())
+        self.assertEqual(str(cm.warning), "Test")
+
 def setUpModule():
     py_warnings.onceregistry.clear()
     c_warnings.onceregistry.clear()
diff --git a/Lib/test/test_warnings/data/deprecated_class.py b/Lib/test/test_warnings/data/deprecated_class.py
new file mode 100644
index 00000000000000..026c5ece369d51
--- /dev/null
+++ b/Lib/test/test_warnings/data/deprecated_class.py
@@ -0,0 +1,9 @@
+from warnings import deprecated
+
+@deprecated("Test")
+class A:
+    def __init_subclass__(self, **kwargs):
+        pass
+
+class B(A):
+    pass
diff --git a/Lib/warnings.py b/Lib/warnings.py
index f20b01372dd7a4..9e74c25f853bfb 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -611,6 +611,7 @@ def __new__(cls, *args, **kwargs):
                 else:
                     return original_new(cls)
 
+            __new__.__module__ = arg.__module__
             arg.__new__ = staticmethod(__new__)
 
             original_init_subclass = arg.__init_subclass__
@@ -637,6 +638,7 @@ def __init_subclass__(*args, **kwargs):
 
             arg.__deprecated__ = __new__.__deprecated__ = msg
             __init_subclass__.__deprecated__ = msg
+            __init_subclass__.__module__ = arg.__module__
             return arg
         elif callable(arg):
             import functools
diff --git a/Misc/NEWS.d/next/Library/2025-01-17-13-38-12.gh-issue-128772.8yEVh2.rst b/Misc/NEWS.d/next/Library/2025-01-17-13-38-12.gh-issue-128772.8yEVh2.rst
new file mode 100644
index 00000000000000..14c2fdf2097d7b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-01-17-13-38-12.gh-issue-128772.8yEVh2.rst
@@ -0,0 +1,3 @@
+Make sure the :attr:`~method.__module__` attribute is set on :meth:`~object.__new__`
+and :meth:`~object.__init_subclass__` when the :func:`warnings.deprecated` decorator
+is applied on classes.