diff --git a/Doc/deprecations/pending-removal-in-3.15.rst b/Doc/deprecations/pending-removal-in-3.15.rst
index 3b9cf892fe913d..00266b1725c8a1 100644
--- a/Doc/deprecations/pending-removal-in-3.15.rst
+++ b/Doc/deprecations/pending-removal-in-3.15.rst
@@ -33,16 +33,6 @@ Pending removal in Python 3.15
 
   * ``load_module()`` method: use ``exec_module()`` instead.
 
-* :class:`locale`:
-
-  * The :func:`~locale.getdefaultlocale` function
-    has been deprecated since Python 3.11.
-    Its removal was originally planned for Python 3.13 (:gh:`90817`),
-    but has been postponed to Python 3.15.
-    Use :func:`~locale.getlocale`, :func:`~locale.setlocale`,
-    and :func:`~locale.getencoding` instead.
-    (Contributed by Hugo van Kemenade in :gh:`111187`.)
-
 * :mod:`pathlib`:
 
   * :meth:`!.PurePath.is_reserved`
diff --git a/Doc/library/locale.rst b/Doc/library/locale.rst
index ce025670c92999..00dd616830bf55 100644
--- a/Doc/library/locale.rst
+++ b/Doc/library/locale.rst
@@ -370,8 +370,6 @@ The :mod:`locale` module defines the following exception and functions:
    determined.
    The "C" locale is represented as ``(None, None)``.
 
-   .. deprecated-removed:: 3.11 3.15
-
 
 .. function:: getlocale(category=LC_CTYPE)
 
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
index 3c7e28a00c9c1a..4aeb3f8e46d316 100644
--- a/Doc/whatsnew/3.15.rst
+++ b/Doc/whatsnew/3.15.rst
@@ -562,6 +562,9 @@ locale
   but included in the language code.
   (Contributed by Serhiy Storchaka in :gh:`137729`.)
 
+* Undeprecate the :func:`locale.getdefaultlocale` function.
+  (Contributed by Victor Stinner in :gh:`130796`.)
+
 
 math
 ----
diff --git a/Lib/locale.py b/Lib/locale.py
index 0f1b429ea419b0..dea3ee55cf4d24 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -559,12 +559,6 @@ def getdefaultlocale(envvars=('LC_ALL', 'LC_CTYPE', 'LANG', 'LANGUAGE')):
 
     """
 
-    import warnings
-    warnings._deprecated(
-        "locale.getdefaultlocale",
-        "{name!r} is deprecated and slated for removal in Python {remove}. "
-        "Use setlocale(), getencoding() and getlocale() instead.",
-        remove=(3, 15))
     return _getdefaultlocale(envvars)
 
 
diff --git a/Lib/test/test_locale.py b/Lib/test/test_locale.py
index d49f78c91da1b3..a06c600cf56689 100644
--- a/Lib/test/test_locale.py
+++ b/Lib/test/test_locale.py
@@ -1,7 +1,6 @@
 from decimal import Decimal
 from test import support
 from test.support import cpython_only, verbose, is_android, linked_to_musl, os_helper
-from test.support.warnings_helper import check_warnings
 from test.support.import_helper import ensure_lazy_imports, import_fresh_module
 from unittest import mock
 import unittest
@@ -654,8 +653,7 @@ def test_defaults_UTF8(self):
                 env.unset('LC_ALL', 'LC_CTYPE', 'LANG', 'LANGUAGE')
                 env.set('LC_CTYPE', 'UTF-8')
 
-                with check_warnings(('', DeprecationWarning)):
-                    self.assertEqual(locale.getdefaultlocale(), (None, 'UTF-8'))
+                self.assertEqual(locale.getdefaultlocale(), (None, 'UTF-8'))
         finally:
             if orig_getlocale is not None:
                 _locale._getdefaultlocale = orig_getlocale
diff --git a/Misc/NEWS.d/next/Library/2025-12-23-11-43-05.gh-issue-130796.TkzUGx.rst b/Misc/NEWS.d/next/Library/2025-12-23-11-43-05.gh-issue-130796.TkzUGx.rst
new file mode 100644
index 00000000000000..a078561a1014fa
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-12-23-11-43-05.gh-issue-130796.TkzUGx.rst
@@ -0,0 +1,2 @@
+Undeprecate the :func:`locale.getdefaultlocale` function.
+Patch by Victor Stinner.