diff --git a/Lib/multiprocessing/synchronize.py b/Lib/multiprocessing/synchronize.py
index 9188114ae284c7..868fc288d9a54f 100644
--- a/Lib/multiprocessing/synchronize.py
+++ b/Lib/multiprocessing/synchronize.py
@@ -8,7 +8,7 @@
 #
 
 __all__ = [
-    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event'
+    'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Condition', 'Event', 'Barrier'
     ]
 
 import threading
diff --git a/Misc/NEWS.d/next/Library/2026-05-07-05-29-06.gh-issue-149400.UAuAtm.rst b/Misc/NEWS.d/next/Library/2026-05-07-05-29-06.gh-issue-149400.UAuAtm.rst
new file mode 100644
index 00000000000000..f3d58ffe217cb8
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-05-07-05-29-06.gh-issue-149400.UAuAtm.rst
@@ -0,0 +1 @@
+Expose ``Barrier`` in ``multiprocessing.synchronize.__all__``.