python
diff --git a/‎Lib/subprocess.py
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+3Lines changed: 3 additions & 0 deletions b/‎Lib/subprocess.py
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diff --git a/‎Misc/NEWS.d/next/Library/2025-04-06-19-25-12.gh-issue-129204.sAVFO6.rst
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@@ -715,6 +715,9 @@ def _use_posix_spawn():
         # os.posix_spawn() is not available
         return False
 
+    if ((_env := os.environ.get('_PYTHON_SUBPROCESS_USE_POSIX_SPAWN')) in ('0', '1')):
+        return bool(int(_env))
+
     if sys.platform in ('darwin', 'sunos5'):
         # posix_spawn() is a syscall on both macOS and Solaris,
         # and properly reports errors
 
@@ -0,0 +1,2 @@
+Introduce new ``_PYTHON_SUBPROCESS_USE_POSIX_SPAWN`` environment variable knob in
+:mod:`subprocess` to control the use of :func:`os.posix_spawn`.
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Introduce new ``_PYTHON_SUBPROCESS_USE_POSIX_SPAWN`` environment variable knob in
	`2`	+:mod:`subprocess` to control the use of :func:`os.posix_spawn`.