diff --git a/Lib/turtledemo/__main__.py b/Lib/turtledemo/__main__.py
index 7c2d753f4c31113..4b7f2814b75e5ad 100644
--- a/Lib/turtledemo/__main__.py
+++ b/Lib/turtledemo/__main__.py
@@ -85,6 +85,7 @@
 """
 import sys
 import os
+import tokenize
 
 from tkinter import *
 from idlelib.colorizer import ColorDelegator, color_config
@@ -333,7 +334,7 @@ def loadfile(self, filename):
         modname = 'turtledemo.' + filename
         __import__(modname)
         self.module = sys.modules[modname]
-        with open(self.module.__file__, 'r') as f:
+        with tokenize.open(self.module.__file__) as f:
             chars = f.read()
         self.text.delete("1.0", "end")
         self.text.insert("1.0", chars)
diff --git a/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst b/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst
new file mode 100644
index 000000000000000..b67b124dc575928
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-08-19-40-00.gh-issue-153319.Qk7bE2.rst
@@ -0,0 +1,3 @@
+The :mod:`turtledemo` viewer now reads each demo script using
+:func:`tokenize.open`, decoding it with the encoding detected from the
+source file.