diff --git a/src/cascadia/TerminalSettingsEditor/Appearances.cpp b/src/cascadia/TerminalSettingsEditor/Appearances.cpp
index 8cf0079138a..a74843e8199 100644
--- a/src/cascadia/TerminalSettingsEditor/Appearances.cpp
+++ b/src/cascadia/TerminalSettingsEditor/Appearances.cpp
@@ -114,7 +114,8 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
     DependencyProperty Appearances::_AppearanceProperty{ nullptr };
 
     Appearances::Appearances() :
-        _ShowAllFonts{ false }
+        _ShowAllFonts{ false },
+        _ShowProportionalFontWarning{ false }
     {
         InitializeComponent();
 
@@ -239,6 +240,14 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         const auto selectedItem{ e.AddedItems().GetAt(0) };
         const auto newFontFace{ unbox_value<Editor::Font>(selectedItem) };
         Appearance().FontFace(newFontFace.LocalizedName());
+        if (!UsingMonospaceFont())
+        {
+            ShowProportionalFontWarning(true);
+        }
+        else
+        {
+            ShowProportionalFontWarning(false);
+        }
     }
 
     void Appearances::_ViewModelChanged(const DependencyObject& d, const DependencyPropertyChangedEventArgs& /*args*/)
@@ -300,6 +309,10 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
                 {
                     _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"CurrentAdjustIndistinguishableColors" });
                 }
+                else if (settingName == L"ShowProportionalFontWarning")
+                {
+                    _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"ShowProportionalFontWarning" });
+                }
                 // YOU THERE ADDING A NEW APPEARANCE SETTING
                 // Make sure you add a block like
                 //
@@ -331,6 +344,7 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
             _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"UsingMonospaceFont" });
             _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"CurrentIntenseTextStyle" });
             _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"CurrentAdjustIndistinguishableColors" });
+            _PropertyChangedHandlers(*this, PropertyChangedEventArgs{ L"ShowProportionalFontWarning" });
         }
     }
 
@@ -411,4 +425,5 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         // whereas SelectedItem identifies which one was selected by the user.
         return FontWeightComboBox().SelectedItem() == _CustomFontWeight;
     }
+
 }
diff --git a/src/cascadia/TerminalSettingsEditor/Appearances.h b/src/cascadia/TerminalSettingsEditor/Appearances.h
index 13f4719a30d..f6be156bc88 100644
--- a/src/cascadia/TerminalSettingsEditor/Appearances.h
+++ b/src/cascadia/TerminalSettingsEditor/Appearances.h
@@ -134,10 +134,10 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         DEPENDENCY_PROPERTY(Editor::AppearanceViewModel, Appearance);
         WINRT_PROPERTY(Editor::ProfileViewModel, SourceProfile, nullptr);
         WINRT_PROPERTY(IHostedInWindow, WindowRoot, nullptr);
-
         GETSET_BINDABLE_ENUM_SETTING(BackgroundImageStretchMode, Windows::UI::Xaml::Media::Stretch, Appearance().BackgroundImageStretchMode);
 
         GETSET_BINDABLE_ENUM_SETTING(IntenseTextStyle, Microsoft::Terminal::Settings::Model::IntenseStyle, Appearance().IntenseTextStyle);
+        WINRT_OBSERVABLE_PROPERTY(bool, ShowProportionalFontWarning, _PropertyChangedHandlers, nullptr);
 
     private:
         bool _ShowAllFonts;
diff --git a/src/cascadia/TerminalSettingsEditor/Appearances.idl b/src/cascadia/TerminalSettingsEditor/Appearances.idl
index 2a83e44459d..acddd41fda6 100644
--- a/src/cascadia/TerminalSettingsEditor/Appearances.idl
+++ b/src/cascadia/TerminalSettingsEditor/Appearances.idl
@@ -63,6 +63,7 @@ namespace Microsoft.Terminal.Settings.Editor
 
         Boolean UsingMonospaceFont { get; };
         Boolean ShowAllFonts;
+        Boolean ShowProportionalFontWarning;
 
         IInspectable CurrentCursorShape;
         Boolean IsVintageCursor { get; };
diff --git a/src/cascadia/TerminalSettingsEditor/Appearances.xaml b/src/cascadia/TerminalSettingsEditor/Appearances.xaml
index 076522ff877..349e9172df4 100644
--- a/src/cascadia/TerminalSettingsEditor/Appearances.xaml
+++ b/src/cascadia/TerminalSettingsEditor/Appearances.xaml
@@ -179,11 +179,13 @@
             </local:SettingContainer>
 
             <!--  Font Face  -->
+
             <local:SettingContainer x:Uid="Profile_FontFace"
                                     ClearSettingValue="{x:Bind Appearance.ClearFontFace}"
                                     HasSettingValue="{x:Bind Appearance.HasFontFace, Mode=OneWay}"
                                     SettingOverrideSource="{x:Bind Appearance.FontFaceOverrideSource, Mode=OneWay}"
                                     Visibility="{x:Bind Appearance.IsDefault, Mode=OneWay}">
+
                 <StackPanel Margin="0,8,0,0">
                     <!--
                         Binding the ItemsSource to a separate variable that switches between the
@@ -210,6 +212,10 @@
                               IsEnabled="{x:Bind UsingMonospaceFont, Mode=OneWay}" />
                 </StackPanel>
             </local:SettingContainer>
+            <muxc:InfoBar x:Uid="Profile_FontFace_ProportionalFontWarning"
+                          IsOpen="{x:Bind ShowProportionalFontWarning, Mode=OneWay}"
+                          Severity="Warning" />
+
 
             <!--  Font Size  -->
             <local:SettingContainer x:Uid="Profile_FontSize"
diff --git a/src/cascadia/TerminalSettingsEditor/Resources/en-US/Resources.resw b/src/cascadia/TerminalSettingsEditor/Resources/en-US/Resources.resw
index 91c51b146ce..ed92fd226d1 100644
--- a/src/cascadia/TerminalSettingsEditor/Resources/en-US/Resources.resw
+++ b/src/cascadia/TerminalSettingsEditor/Resources/en-US/Resources.resw
@@ -1592,5 +1592,13 @@
   <data name="Settings_PortableModeInfoLinkTextRun.Text" xml:space="preserve">
     <value>Learn more.</value>
     <comment>A hyperlink displayed near Settings_PortableModeNote.Text that the user can follow for more information.</comment>
+  </data>
+	<data name="Profile_FontFace_ProportionalFontWarning.Title" xml:space="preserve">
+    <value>Warning:</value>
+    <comment>Title for the warning info bar used when a non monospace font face is chosen to indicate that there may be visual artifacts</comment>
+  </data>
+	<data name="Profile_FontFace_ProportionalFontWarning.Message" xml:space="preserve">
+    <value>Choosing a non-monospaced font will likely result in visual artifacts. Use at your own discretion.</value>
+    <comment>Warning info bar used when a non monospace font face is chosen to indicate that there may be visual artifacts</comment>
   </data>
 </root>