diff --git a/Lib/test/libregrtest/cmdline.py b/Lib/test/libregrtest/cmdline.py
index 81c7106ac0c0f4..45d7015cc78b52 100644
--- a/Lib/test/libregrtest/cmdline.py
+++ b/Lib/test/libregrtest/cmdline.py
@@ -122,6 +122,9 @@
 
     tzdata -         Run tests that require timezone data.
 
+    idle -           Run tests that require an otherwise idle system as
+                     they are sensitive to timing.
+
 To enable all resources except one, use '-uall,-<resource>'.  For
 example, to run all the tests except for the gui tests, give the
 option '-uall,-gui'.
diff --git a/Lib/test/libregrtest/utils.py b/Lib/test/libregrtest/utils.py
index 3eff9e753b6d84..1b0226108d17f5 100644
--- a/Lib/test/libregrtest/utils.py
+++ b/Lib/test/libregrtest/utils.py
@@ -33,7 +33,7 @@
 
 
 ALL_RESOURCES = ('audio', 'curses', 'largefile', 'network',
-                 'decimal', 'cpu', 'subprocess', 'urlfetch', 'gui', 'walltime')
+                 'decimal', 'cpu', 'subprocess', 'urlfetch', 'gui', 'walltime', 'idle')
 
 # Other resources excluded from --use=all:
 #
diff --git a/Misc/NEWS.d/next/Tests/2025-02-24-12-50-56.gh-issue-130363.zeM6ig.rst b/Misc/NEWS.d/next/Tests/2025-02-24-12-50-56.gh-issue-130363.zeM6ig.rst
new file mode 100644
index 00000000000000..34307b908c681f
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2025-02-24-12-50-56.gh-issue-130363.zeM6ig.rst
@@ -0,0 +1,2 @@
+Add the ``idle`` resource for flagging tests that need an idle system as
+they're sensitive to timing.