diff --git a/Lib/multiprocessing/context.py b/Lib/multiprocessing/context.py
index 051d567d457928..a7e319575832d0 100644
--- a/Lib/multiprocessing/context.py
+++ b/Lib/multiprocessing/context.py
@@ -236,9 +236,7 @@ def __init__(self, context):
def get_context(self, method=None):
if method is None:
- if self._actual_context is None:
- self._actual_context = self._default_context
- return self._actual_context
+ return self._actual_context or self._default_context
else:
return super().get_context(method)
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index a1259ff1d63d18..9b5ec8cf174bee 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -5811,6 +5811,12 @@ def check_context(self, ctx):
p.join()
self.assertEqual(child_method, ctx.get_start_method())
+ def test_default_context(self):
+ # Get_context should not have side effect, see gh-109070.
+ multiprocessing.set_start_method(None, force=True)
+ multiprocessing.get_context()
+ self.assertIsNone(multiprocessing.context._default_context._actual_context)
+
def test_context(self):
for method in ('fork', 'spawn', 'forkserver'):
try:
diff --git a/Misc/NEWS.d/next/Library/2025-06-18-23-59-40.gh-issue-109070.2XNJ7X.rst b/Misc/NEWS.d/next/Library/2025-06-18-23-59-40.gh-issue-109070.2XNJ7X.rst
new file mode 100644
index 00000000000000..e2f45736a438ce
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-18-23-59-40.gh-issue-109070.2XNJ7X.rst
@@ -0,0 +1 @@
+:func:`multiprocessing.get_context` will not set the start method globally.
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