diff --git a/Misc/NEWS.d/next/Tools-Demos/2025-11-12-12-54-28.gh-issue-141442.50dS3P.rst b/Misc/NEWS.d/next/Tools-Demos/2025-11-12-12-54-28.gh-issue-141442.50dS3P.rst
new file mode 100644
index 00000000000000..073c070413f7e0
--- /dev/null
+++ b/Misc/NEWS.d/next/Tools-Demos/2025-11-12-12-54-28.gh-issue-141442.50dS3P.rst
@@ -0,0 +1 @@
+The iOS testbed now correctly handles test arguments that contain spaces.
diff --git a/iOS/testbed/__main__.py b/iOS/testbed/__main__.py
index 6a4d9c76d162b4..62a85a034ebd5f 100644
--- a/iOS/testbed/__main__.py
+++ b/iOS/testbed/__main__.py
@@ -1,6 +1,7 @@
 import argparse
 import json
 import re
+import shlex
 import shutil
 import subprocess
 import sys
@@ -206,7 +207,7 @@ def update_test_plan(testbed_path, args):
         test_plan = json.load(f)
 
     test_plan["defaultOptions"]["commandLineArgumentEntries"] = [
-        {"argument": arg} for arg in args
+        {"argument": shlex.quote(arg)} for arg in args
     ]
 
     with test_plan_path.open("w", encoding="utf-8") as f: