diff --git a/src/Avalonia.Base/Threading/DispatcherOperation.cs b/src/Avalonia.Base/Threading/DispatcherOperation.cs
index e32b7e809a..871eca1a43 100644
--- a/src/Avalonia.Base/Threading/DispatcherOperation.cs
+++ b/src/Avalonia.Base/Threading/DispatcherOperation.cs
@@ -117,7 +117,7 @@ public class DispatcherOperation
     /// </summary>
     /// <returns>
     ///     The status of the operation.  To obtain the return value
-    ///     of the invoked delegate, use the the Result property.
+    ///     of the invoked delegate, use the Result property.
     /// </returns>
     public void Wait() => Wait(TimeSpan.FromMilliseconds(-1));
 
diff --git a/src/Avalonia.Controls.DataGrid/DataGridColumn.cs b/src/Avalonia.Controls.DataGrid/DataGridColumn.cs
index cc043a6ed9..6353f7ebb9 100644
--- a/src/Avalonia.Controls.DataGrid/DataGridColumn.cs
+++ b/src/Avalonia.Controls.DataGrid/DataGridColumn.cs
@@ -614,7 +614,7 @@ namespace Avalonia.Controls
         }
 
         /// <summary>
-        /// Gets the value of a cell according to the the specified binding.
+        /// Gets the value of a cell according to the specified binding.
         /// </summary>
         /// <param name="item">The item associated with a cell.</param>
         /// <param name="binding">The binding to get the value of.</param>
diff --git a/src/Avalonia.Controls.DataGrid/IndexToValueTable.cs b/src/Avalonia.Controls.DataGrid/IndexToValueTable.cs
index 68a2fc562f..bd798287a6 100644
--- a/src/Avalonia.Controls.DataGrid/IndexToValueTable.cs
+++ b/src/Avalonia.Controls.DataGrid/IndexToValueTable.cs
@@ -140,11 +140,11 @@ namespace Avalonia.Controls
         }
 
         /// <summary>
-        /// Returns true if the given index is contained in the table with the the given value
+        /// Returns true if the given index is contained in the table with the given value
         /// </summary>
         /// <param name="index">index to search for</param>
         /// <param name="value">value expected</param>
-        /// <returns>true if the given index is contained in the table with the the given value</returns>
+        /// <returns>true if the given index is contained in the table with the given value</returns>
         public bool ContainsIndexAndValue(int index, T value)
         {
             int lowerRangeIndex = this.FindRangeIndex(index);
diff --git a/src/Avalonia.Controls/Automation/Peers/AutomationPeer.cs b/src/Avalonia.Controls/Automation/Peers/AutomationPeer.cs
index fb7cdd87ed..35d6c13918 100644
--- a/src/Avalonia.Controls/Automation/Peers/AutomationPeer.cs
+++ b/src/Avalonia.Controls/Automation/Peers/AutomationPeer.cs
@@ -182,7 +182,7 @@ namespace Avalonia.Automation.Peers
         public event EventHandler<AutomationPropertyChangedEventArgs>? PropertyChanged;
 
         /// <summary>
-        /// Raises an event to notify the automation client the the children of the peer have changed.
+        /// Raises an event to notify the automation client the children of the peer have changed.
         /// </summary>
         protected void RaiseChildrenChangedEvent() => ChildrenChanged?.Invoke(this, EventArgs.Empty);
 
diff --git a/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs b/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
index 2097cd2d1a..c4ee65ab13 100644
--- a/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
+++ b/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
@@ -520,7 +520,7 @@ namespace Avalonia.Controls.Platform
                             }
                             else if (item?.Parent?.MoveSelection(direction.Value, true) == true)
                             {
-                                // If the the parent is an IMenu which successfully moved its selection,
+                                // If the parent is an IMenu which successfully moved its selection,
                                 // and the current menu is open then close the current menu and open the
                                 // new menu.
                                 if (item.IsSubMenuOpen &&
diff --git a/src/Avalonia.Controls/Primitives/Popup.cs b/src/Avalonia.Controls/Primitives/Popup.cs
index 55c368b4f9..08ef39947c 100644
--- a/src/Avalonia.Controls/Primitives/Popup.cs
+++ b/src/Avalonia.Controls/Primitives/Popup.cs
@@ -258,7 +258,7 @@ namespace Avalonia.Controls.Primitives
         }
 
         /// <summary>
-        /// Gets or sets the the anchor rectangle within the parent that the popup will be placed
+        /// Gets or sets the anchor rectangle within the parent that the popup will be placed
         /// relative to when <see cref="Placement"/> is <see cref="PlacementMode.AnchorAndGravity"/>.
         /// </summary>
         /// <remarks>
@@ -289,7 +289,7 @@ namespace Avalonia.Controls.Primitives
         /// through to the parent window.
         /// </summary>
         /// <remarks>
-        /// When <see cref="IsLightDismissEnabled"/> is set to true, clicks outside the the popup
+        /// When <see cref="IsLightDismissEnabled"/> is set to true, clicks outside the popup
         /// cause the popup to close. When <see cref="OverlayDismissEventPassThrough"/> is set to
         /// false, these clicks will be handled by the popup and not be registered by the parent
         /// window. When set to true, the events will be passed through to the parent window.
diff --git a/src/Avalonia.Controls/VirtualizingPanel.cs b/src/Avalonia.Controls/VirtualizingPanel.cs
index 0ee4767769..779aa811b4 100644
--- a/src/Avalonia.Controls/VirtualizingPanel.cs
+++ b/src/Avalonia.Controls/VirtualizingPanel.cs
@@ -77,7 +77,7 @@ namespace Avalonia.Controls
         /// item is realized; otherwise, null.
         /// </returns>
         /// <remarks>
-        /// Note for implementors: if the item at the the specified index is an ItemIsOwnContainer
+        /// Note for implementors: if the item at the specified index is an ItemIsOwnContainer
         /// item that has previously been realized, then the item should be returned even if it
         /// currently falls outside the realized viewport.
         /// </remarks>
diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
index 5292aadab2..a8718524a5 100644
--- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
+++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlSelectorTransformer.cs
@@ -36,7 +36,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
                 return node;
 
             if (pn.Values.Count != 1)
-                throw new XamlSelectorsTransformException("Selector property should should have exactly one value",
+                throw new XamlSelectorsTransformException("Selector property should have exactly one value",
                     node);
             
             if (pn.Values[0] is XamlIlSelectorNode)
diff --git a/src/Markup/Avalonia.Markup/Data/RelativeSource.cs b/src/Markup/Avalonia.Markup/Data/RelativeSource.cs
index 037175a137..adba9e722c 100644
--- a/src/Markup/Avalonia.Markup/Data/RelativeSource.cs
+++ b/src/Markup/Avalonia.Markup/Data/RelativeSource.cs
@@ -45,7 +45,7 @@ namespace Avalonia.Data
     }
 
     /// <summary>
-    /// Describes the the location of a binding source, relative to the binding target.
+    /// Describes the location of a binding source, relative to the binding target.
     /// </summary>
     public class RelativeSource
     {