diff --git a/src/App/Property.h b/src/App/Property.h
index 2408df85cc..f2f6487d27 100644
--- a/src/App/Property.h
+++ b/src/App/Property.h
@@ -266,7 +266,7 @@ public:
      * This function sets the value of the property identified by the path.  It
      * is meant to be overridden for subclasses in which the `path` is
      * typically ignored.  The default implementation redirects setting a value
-     * to the the `path` ObjectIdentifier.
+     * to the `path` ObjectIdentifier.
      *
      * @param[in] path The path to the property.
      * @param[in] value The value to set.
diff --git a/src/Gui/ToolBarManager.cpp b/src/Gui/ToolBarManager.cpp
index 2454735bfb..61232d64bf 100644
--- a/src/Gui/ToolBarManager.cpp
+++ b/src/Gui/ToolBarManager.cpp
@@ -645,7 +645,7 @@ void ToolBarManager::setupToolBarIconSize()
 {
     int s = toolBarIconSize();
     getMainWindow()->setIconSize(QSize(s, s));
-    // Most of the the toolbar will have explicit icon size, so the above call
+    // Most of the toolbar will have explicit icon size, so the above call
     // to QMainWindow::setIconSize() will have no effect. We need to explicitly
     // change the icon size.
     QList<QToolBar*> bars = getMainWindow()->findChildren<QToolBar*>();
diff --git a/src/Mod/Part/App/TopoShape.h b/src/Mod/Part/App/TopoShape.h
index 8cf4f325f4..0f154716b3 100644
--- a/src/Mod/Part/App/TopoShape.h
+++ b/src/Mod/Part/App/TopoShape.h
@@ -1192,7 +1192,7 @@ public:
      * @param base: the base shape
      * @param axis: the revolving axis
      * @param d: rotation angle in degree
-     * @param face_maker: optional type name of the the maker used to make a
+     * @param face_maker: optional type name of the maker used to make a
      *                    face from basis shape
      * @param op: optional string to be encoded into topo naming for indicating
      *            the operation
@@ -1214,7 +1214,7 @@ public:
      *
      * @param axis: the revolving axis
      * @param d: rotation angle in degree
-     * @param face_maker: optional type name of the the maker used to make a
+     * @param face_maker: optional type name of the maker used to make a
      *                    face from basis shape
      * @param op: optional string to be encoded into topo naming for indicating
      *            the operation
@@ -1237,7 +1237,7 @@ public:
      * @param base: the basis shape (solid)
      * @param profile: the shape to be revolved
      * @param axis: the revolving axis
-     * @param face_maker: optional type name of the the maker used to make a
+     * @param face_maker: optional type name of the maker used to make a
      *                    face from basis shape
      * @param supportface:  the bottom face for the revolution, or null
      * @param uptoface:  the upper limit face for the revolution, or null
@@ -1263,7 +1263,7 @@ public:
     /** Make revolved shell around a basis shape
      *
      * @param axis: the revolving axis
-     * @param face_maker: optional type name of the the maker used to make a
+     * @param face_maker: optional type name of the maker used to make a
      *                    face from basis shape
      * @param supportface:  the bottom face for the revolution, or null
      * @param uptoface:  the upper limit face for the revolution, or null
@@ -2719,7 +2719,7 @@ public:
      *
      * @param shapes: input shapes of any type. The function will automatically
      *                discover connected and closed edges to be used as the
-     *                boundary of the the new face. Any other vertex, edge,
+     *                boundary of the new face. Any other vertex, edge,
      *                and/or face will be used as constraints to fine tune the
      *                surface generation.
      * @param params: @sa BRepFillingParams
diff --git a/src/Mod/Part/App/TopoShapeExpansion.cpp b/src/Mod/Part/App/TopoShapeExpansion.cpp
index 00e2fd5a6d..716478077b 100644
--- a/src/Mod/Part/App/TopoShapeExpansion.cpp
+++ b/src/Mod/Part/App/TopoShapeExpansion.cpp
@@ -2163,10 +2163,7 @@ TopoShape& TopoShape::makeElementEvolve(
     if (profileShape.IsNull() || !BRepBuilderAPI_FindPlane(profileShape).Found()) {
         if (profileShape.IsNull() || profile.countSubShapes(TopAbs_EDGE) > 1
             || !profile.getSubTopoShape(TopAbs_EDGE, 1).isLinearEdge()) {
-            FC_THROWM(
-                Base::CADKernelError,
-                "Expect the the profile to be a planar wire or a face or a line"
-            );
+            FC_THROWM(Base::CADKernelError, "Expect the profile to be a planar wire or a face or a line");
         }
     }
     if (spineShape.ShapeType() == TopAbs_FACE) {
@@ -3642,7 +3639,7 @@ struct MapperPrism: MapperMaker
             TopoShape shape(maker.Shape());
             for (auto& vertex : bottom.getSubShapes(TopAbs_VERTEX)) {
                 for (auto& e : shape.findAncestorsShapes(vertex, TopAbs_EDGE)) {
-                    // Make sure to not visit the the same edge twice.
+                    // Make sure to not visit the same edge twice.
                     // And check only edge that are not found in the bottom profile
                     if (!edgeSet.insert(e).second && !bottom.findShape(e)) {
                         auto otherVertex = TopExp::FirstVertex(TopoDS::Edge(e));
diff --git a/src/Mod/TechDraw/App/ShapeExtractor.cpp b/src/Mod/TechDraw/App/ShapeExtractor.cpp
index 51065cc671..9d7d25eb86 100644
--- a/src/Mod/TechDraw/App/ShapeExtractor.cpp
+++ b/src/Mod/TechDraw/App/ShapeExtractor.cpp
@@ -79,7 +79,7 @@ std::vector<TopoDS_Shape> ShapeExtractor::getShapes2d(const std::vector<App::Doc
     return shapes2d;
 }
 
-//! get the located and oriented shapes corresponding to the the links. If the shapes are to be
+//! get the located and oriented shapes corresponding to the links. If the shapes are to be
 //! fused, include2d should be false as 2d & 3d shapes may not fuse.
 TopoDS_Shape ShapeExtractor::getShapes(const std::vector<App::DocumentObject*> links, bool include2d)
 {
diff --git a/src/Mod/TechDraw/Gui/QGIProjGroup.cpp b/src/Mod/TechDraw/Gui/QGIProjGroup.cpp
index af8da4512d..81d1d44168 100644
--- a/src/Mod/TechDraw/Gui/QGIProjGroup.cpp
+++ b/src/Mod/TechDraw/Gui/QGIProjGroup.cpp
@@ -61,7 +61,7 @@ bool QGIProjGroup::autoDistributeEnabled() const
 
 
 // note that we are not actually handling any of these events (ie we don't return true, and we don't
-// set the the event to ignore) here.
+// set the event to ignore) here.
 bool QGIProjGroup::sceneEventFilter(QGraphicsItem* watched, QEvent *event)
 {
     auto qvpart = dynamic_cast<QGIViewPart*>(watched);