diff --git a/Lib/os.py b/Lib/os.py
index 6e6db96b307..52cbc5bc858 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -832,6 +832,7 @@ def reload_environ():
         env_data.clear()
         env_data.update(data)
 
+    __all__.append("reload_environ")
 
 def getenv(key, default=None):
     """Get an environment variable, return None if it doesn't exist.
diff --git a/Misc/NEWS.d/next/Library/2025-10-29-16-12-41.gh-issue-120057.qGj5Dl.rst b/Misc/NEWS.d/next/Library/2025-10-29-16-12-41.gh-issue-120057.qGj5Dl.rst
new file mode 100644
index 00000000000..f6b42be1fbf
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-10-29-16-12-41.gh-issue-120057.qGj5Dl.rst
@@ -0,0 +1 @@
+Add :func:`os.reload_environ` to ``os.__all__``.