diff --git a/EDMarketConnector.py b/EDMarketConnector.py
index 36898f3f..cee1a52a 100755
--- a/EDMarketConnector.py
+++ b/EDMarketConnector.py
@@ -299,6 +299,13 @@ class AppWindow:
 
         self.postprefs(False)	# Companion login happens in callback from monitor
 
+        if len(plug.PLUGINS_not_py3):
+            import tkMessageBox
+            tkMessageBox.showinfo('Plugins Without Python 3.x Support',
+                    "One or more of your enabled plugins do not yet have support for Python 3.x.  Please see the list on the 'Plugins' tab of 'File' > 'Settings'.  You should check if there is an updated version available, else alert the developer that they will need to update the code when EDMC moves to Python 3.x"
+            )
+
+
     # callback after the Preferences dialog is applied
     def postprefs(self, dologin=True):
         self.prefsdialog = None
diff --git a/plug.py b/plug.py
index e6b0e87d..0577c607 100644
--- a/plug.py
+++ b/plug.py
@@ -65,6 +65,7 @@ GuiFocusCodex = 11
 
 # List of loaded Plugins
 PLUGINS = []
+PLUGINS_not_py3 = []
 
 # For asynchronous error display
 last_error = {
@@ -195,6 +196,14 @@ def load_plugins(master):
                 print_exc()
     PLUGINS.extend(sorted(found, key = lambda p: operator.attrgetter('name')(p).lower()))
 
+    #########################################################
+    # Detect plugins that aren't yet ready for Python 3.x
+    #########################################################
+    for p in PLUGINS:
+        if p.module and p.folder and not p._get_func('plugin_start3'):
+            PLUGINS_not_py3.append(p)
+    #########################################################
+
     imp.release_lock()
 
 def provides(fn_name):
diff --git a/prefs.py b/prefs.py
index 5096d194..3a5024c8 100644
--- a/prefs.py
+++ b/prefs.py
@@ -273,6 +273,18 @@ class PreferencesDialog(tk.Toplevel):
                     label = nb.Label(plugsframe, text='%s (%s)' % (plugin.folder, plugin.name))
                 label.grid(columnspan=2, padx=PADX*2, sticky=tk.W)
 
+        ############################################################
+        # Show which plugins don't have Python 3.x support
+        ############################################################
+        if len(plug.PLUGINS_not_py3):
+            ttk.Separator(plugsframe, orient=tk.HORIZONTAL).grid(columnspan=3, padx=PADX, pady=PADY * 8, sticky=tk.EW)
+            nb.Label(plugsframe, text=_('Plugins Without Python 3.x Support')+':').grid(padx=PADX, sticky=tk.W)	# List of plugins in settings
+            for plugin in plug.PLUGINS_not_py3:
+                if plugin.folder: # 'system' ones have this set to None to suppress listing in Plugins prefs tab
+                    nb.Label(plugsframe, text=plugin.name).grid(columnspan=2, padx=PADX*2, sticky=tk.W)
+
+        ############################################################
+
         disabled_plugins = [x for x in plug.PLUGINS if x.folder and not x.module]
         if len(disabled_plugins):
             ttk.Separator(plugsframe, orient=tk.HORIZONTAL).grid(columnspan=3, padx=PADX, pady=PADY * 8, sticky=tk.EW)