diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 3cc027aa368b6b..d3ec10baa1cc3b 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -563,6 +563,7 @@ def _default_mime_types():
         '.tsv'    : 'text/tab-separated-values',
         '.vtt'    : 'text/vtt',
         '.py'     : 'text/x-python',
+        '.rst'    : 'text/x-rst',
         '.etx'    : 'text/x-setext',
         '.sgm'    : 'text/x-sgml',
         '.sgml'   : 'text/x-sgml',
diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
index cc91d539d477fa..ed5ccdda468ff8 100644
--- a/Lib/test/test_mimetypes.py
+++ b/Lib/test/test_mimetypes.py
@@ -214,6 +214,7 @@ def check_extensions():
             self.assertEqual(mimetypes.guess_extension('message/rfc822'), '.eml')
             self.assertEqual(mimetypes.guess_extension('text/html'), '.html')
             self.assertEqual(mimetypes.guess_extension('text/plain'), '.txt')
+            self.assertEqual(mimetypes.guess_extension('text/x-rst'), '.rst')
             self.assertEqual(mimetypes.guess_extension('video/mpeg'), '.mpeg')
             self.assertEqual(mimetypes.guess_extension('video/quicktime'), '.mov')
 
diff --git a/Misc/NEWS.d/next/Library/2024-05-05-16-08-03.gh-issue-101137.71ECXu.rst b/Misc/NEWS.d/next/Library/2024-05-05-16-08-03.gh-issue-101137.71ECXu.rst
new file mode 100644
index 00000000000000..3df689b2f03866
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-05-05-16-08-03.gh-issue-101137.71ECXu.rst
@@ -0,0 +1 @@
+Mime type ``text/x-rst`` is now supported by :mod:`mimetypes`.