diff --git a/Lib/idlelib/configdialog.py b/Lib/idlelib/configdialog.py
index 22359735874d19..7b844f00e7736d 100644
--- a/Lib/idlelib/configdialog.py
+++ b/Lib/idlelib/configdialog.py
@@ -607,8 +607,9 @@ def load_font_cfg(self):
         font_bold  = configured_font[2]=='bold'
 
         # Set editor font selection list and font_name.
-        fonts = list(tkFont.families(self))
-        fonts.sort()
+        fonts = tkFont.families(self)
+        # remove duplicated names and sort
+        fonts = sorted(set(fonts))
         for font in fonts:
             self.fontlist.insert(END, font)
         self.font_name.set(font_name)
diff --git a/Misc/NEWS.d/next/IDLE/2020-02-10-17-09-48.bpo-39600.X6NsyM.rst b/Misc/NEWS.d/next/IDLE/2020-02-10-17-09-48.bpo-39600.X6NsyM.rst
new file mode 100644
index 00000000000000..102aa75f5813e0
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2020-02-10-17-09-48.bpo-39600.X6NsyM.rst
@@ -0,0 +1 @@
+In the font configuration window, remove duplicated font names.