diff -r eba85ae7d128 Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Sun Apr 12 00:26:43 2015 -0400
+++ b/Lib/idlelib/PyShell.py	Sun Apr 12 18:52:31 2015 -0400
@@ -1398,6 +1398,21 @@
     def close(self):
         self.shell.close()
 
+def set_icon_to_idle_icon(toplevel_widget):
+    # Given the toplevel widget (as returned by Tk()), sets the window's
+    # icon to the IDLE icon.
+    icondir = os.path.join(os.path.dirname(__file__), 'Icons')
+    if system() == 'Windows':
+        # Windows uses the idle.ico file for the icon.
+        iconfile = os.path.join(icondir, 'idle.ico')
+        toplevel_widget.wm_iconbitmap(default=iconfile)
+    elif TkVersion >= 8.5:
+        # Non-Windows uses the .png or .gif file for the icon.
+        ext = '.png' if TkVersion >= 8.6 else '.gif'
+        iconfiles = [os.path.join(icondir, 'idle_%d%s' % (size, ext))
+                     for size in (16, 32, 48)]
+        icons = [PhotoImage(file=iconfile) for iconfile in iconfiles]
+        toplevel_widget.wm_iconphoto(True, *icons)
 
 usage_msg = """\
 
@@ -1535,16 +1550,7 @@
     root = Tk(className="Idle")
 
     # set application icon
-    icondir = os.path.join(os.path.dirname(__file__), 'Icons')
-    if system() == 'Windows':
-        iconfile = os.path.join(icondir, 'idle.ico')
-        root.wm_iconbitmap(default=iconfile)
-    elif TkVersion >= 8.5:
-        ext = '.png' if TkVersion >= 8.6 else '.gif'
-        iconfiles = [os.path.join(icondir, 'idle_%d%s' % (size, ext))
-                     for size in (16, 32, 48)]
-        icons = [PhotoImage(file=iconfile) for iconfile in iconfiles]
-        root.wm_iconphoto(True, *icons)
+    set_icon_to_idle_icon(root)
 
     fixwordbreaks(root)
     root.withdraw()
diff -r eba85ae7d128 Lib/turtle.py
--- a/Lib/turtle.py	Sun Apr 12 00:26:43 2015 -0400
+++ b/Lib/turtle.py	Sun Apr 12 18:52:31 2015 -0400
@@ -114,6 +114,7 @@
 from os.path import isfile, split, join
 from copy import deepcopy
 from tkinter import simpledialog
+from idlelib import PyShell
 
 _tg_classes = ['ScrolledCanvas', 'TurtleScreen', 'Screen',
                'RawTurtle', 'Turtle', 'RawPen', 'Pen', 'Shape', 'Vec2D']
@@ -433,6 +434,8 @@
     def __init__(self):
         TK.Tk.__init__(self)
 
+        PyShell.set_icon_to_idle_icon(self)
+
     def setupcanvas(self, width, height, cwidth, cheight):
         self._canvas = ScrolledCanvas(self, width, height, cwidth, cheight)
         self._canvas.pack(expand=1, fill="both")
diff -r eba85ae7d128 Lib/turtledemo/__main__.py
--- a/Lib/turtledemo/__main__.py	Sun Apr 12 00:26:43 2015 -0400
+++ b/Lib/turtledemo/__main__.py	Sun Apr 12 18:52:31 2015 -0400
@@ -92,6 +92,7 @@
 from idlelib.Percolator import Percolator
 from idlelib.ColorDelegator import ColorDelegator
 from idlelib.textView import view_text
+from idlelib import PyShell
 from turtledemo import __doc__ as about_turtledemo
 
 import turtle
@@ -131,6 +132,9 @@
         root.title('Python turtle-graphics examples')
         root.wm_protocol("WM_DELETE_WINDOW", self._destroy)
 
+        import pdb; pdb.set_trace()
+        PyShell.set_icon_to_idle_icon(root)
+
         if darwin:
             import subprocess
             # Make sure we are the currently activated OS X application