diff --git a/src/App/ExpressionParser.y b/src/App/ExpressionParser.y
index fd7a42cb88f4..c6ea48d11f58 100644
--- a/src/App/ExpressionParser.y
+++ b/src/App/ExpressionParser.y
@@ -26,7 +26,7 @@
 /* Represents the many different ways we can access our data */
 
 /* NOTE: this parser requires a patched version of bison 3.0.4. You can find
- * the patch file under this directroy named ExpressionParser.bison-3.0.4.patch.
+ * the patch file under this directory named ExpressionParser.bison-3.0.4.patch.
  * The original patch is published at
  *
  * http://lists.gnu.org/archive/html/bug-bison/2018-03/msg00002.html
diff --git a/src/App/Link.h b/src/App/Link.h
index dde56d4e1a0a..386c88a92cd7 100644
--- a/src/App/Link.h
+++ b/src/App/Link.h
@@ -100,7 +100,7 @@ class AppExport LinkBaseExtension : public App::DocumentObjectExtension
 #define LINK_PARAM_COPY_ON_CHANGE(...) \
     (LinkCopyOnChange, long, App::PropertyEnumeration, ((long)0), \
       "Disabled: disable copy on change\n"\
-      "Enabled: enable copy linked object on change of any of its propert marked as CopyOnChange\n"\
+      "Enabled: enable copy linked object on change of any of its property marked as CopyOnChange\n"\
       "Owned: indicate the linked object has been copied and is own owned by the link. And the\n"\
       "       the link will try to sync any change of the original linked object back to the copy.",\
       ##__VA_ARGS__)
diff --git a/src/App/ObjectIdentifier.cpp b/src/App/ObjectIdentifier.cpp
index 45683208082e..b490120d4e85 100644
--- a/src/App/ObjectIdentifier.cpp
+++ b/src/App/ObjectIdentifier.cpp
@@ -1649,7 +1649,7 @@ Property *ObjectIdentifier::resolveProperty(const App::DocumentObject *obj,
             std::string _subname;
             const char *s = subname.c_str();
 
-            // If no middle dot found, try interprete it as label
+            // If no middle dot found, try interpreting it as label
             if(ptype!=PseudoShape && subname[0]!='$' && subname.find('.') == std::string::npos) {
                 _subname = "$";
                 _subname += subname;
diff --git a/src/App/Property.h b/src/App/Property.h
index a05630615137..4a6163234e9c 100644
--- a/src/App/Property.h
+++ b/src/App/Property.h
@@ -131,7 +131,7 @@ class AppExport Property : public Base::Persistence
     /// get the name of this property in the belonging container
     const char* getName(void) const;
 
-    /** Return a full quanlified property name that include its own's name
+    /** Return a fully qualified property name that include its own's name
      * @param python: if true, then return an expression for accessing this property in Python
      */
     virtual std::string getFullName(bool python=false) const;
@@ -269,7 +269,7 @@ class AppExport Property : public Base::Persistence
      * internal counter. The intention of the ID is to be used as a key for
      * mapping, instead of using the raw pointer. Because, it is possible for
      * the runtime memory allocator to reuse just deleted memory, which will
-     * cause hard to debug problem if use pointer as key. 
+     * cause hard to debug problem if use pointer as key.
      */
     long getID() const {return _id;}
 
diff --git a/src/App/PropertyContainer.h b/src/App/PropertyContainer.h
index 2f8b0bfa6e1f..ae11a8e5015a 100644
--- a/src/App/PropertyContainer.h
+++ b/src/App/PropertyContainer.h
@@ -161,7 +161,7 @@ class AppExport PropertyContainer: public Base::Persistence
 
   virtual unsigned int getMemSize (void) const;
 
-  /** Return a full quanlified name for this container
+  /** Return a fully qualified name for this container
    *  @param python: if true, then return an expression for accessing this container in Python
    */
   virtual std::string getFullName(bool python=false) const {
diff --git a/src/Gui/CommandDoc.cpp b/src/Gui/CommandDoc.cpp
index 254670608503..93957fd7eba8 100644
--- a/src/Gui/CommandDoc.cpp
+++ b/src/Gui/CommandDoc.cpp
@@ -553,7 +553,7 @@ StdCmdSaveAsDirectory::StdCmdSaveAsDirectory()
 {
   sGroup        = QT_TR_NOOP("File");
   sMenuText     = QT_TR_NOOP("Save as &Directory...");
-  sToolTipText  = QT_TR_NOOP("Save the active document in a direcotry without compression");
+  sToolTipText  = QT_TR_NOOP("Save the active document in a directory without compression");
   sWhatsThis    = "Std_SaveAsDirectory";
   sStatusTip    = sToolTipText;
   eType         = 0;
diff --git a/src/Gui/DlgExpressionInput.cpp b/src/Gui/DlgExpressionInput.cpp
index 91663f6cbc29..bc2fa5d732c2 100644
--- a/src/Gui/DlgExpressionInput.cpp
+++ b/src/Gui/DlgExpressionInput.cpp
@@ -260,7 +260,7 @@ void DlgExpressionInput::onTimer()
     }
     catch (App::ExpressionFunctionDisabledException &) {
         ui->msg->setStyleSheet(QString::fromLatin1("*{%1;%2}").arg(background,colorWarning));
-        ui->msg->setPlainText(tr("Function evaluation and attribute writting are disabled while editing. "
+        ui->msg->setPlainText(tr("Function evaluation and attribute writing are disabled while editing. "
                                  "You can enable it by checking 'Evaluate function' here. "
                                  "Be aware that invoking function may cause unexpected change "
                                  "to various objects."));
diff --git a/src/Gui/ExprParams.h b/src/Gui/ExprParams.h
index 14ff8e1dc3c8..6b14d6dc4511 100644
--- a/src/Gui/ExprParams.h
+++ b/src/Gui/ExprParams.h
@@ -64,7 +64,7 @@ class GuiExport ExprParams: public ParameterGrp::ObserverType {
 
 #define FC_EXPR_PARAMS \
     FC_EXPR_PARAM(CompleterCaseSensitive,bool,Bool,false,\
-       QT_TRANSLATE_NOOP("ExprParams","Expression completer with case sensistive")) \
+       QT_TRANSLATE_NOOP("ExprParams","Expression completer with case sensitive")) \
     FC_EXPR_PARAM(CompleterMatchExact,bool,Bool,false,\
        QT_TRANSLATE_NOOP("ExprParams","Expression completer match exact")) \
     FC_EXPR_PARAM(NoSystemBackground,bool,Bool,true,\
diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index f79bb43b43e8..843004586435 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -236,7 +236,7 @@ class DocumentObjectItem : public QTreeWidgetItem
     // check if a new item is required at root
     bool requiredAtRoot(bool excludeSelf=true, bool delay=false) const;
 
-    // return the owner, and full quanlified subname
+    // return the owner, and fully qualified subname
     App::DocumentObject *getFullSubName(std::ostringstream &str,
             DocumentObjectItem *parent = 0) const;
 
@@ -2299,7 +2299,7 @@ void TreeWidget::onToolTipTimer()
         info = QString::fromUtf8(Obj->Label2.getValue());
     else if (!Obj->isError()) {
         if (tag == Gui::treeVisibilityIconTag())
-            info = QObject::tr("Click to toggle visiblity.\nAlt + click to toggle show on top.");
+            info = QObject::tr("Click to toggle visibility.\nAlt + click to toggle show on top.");
         else {
             info = item->object()->getToolTip(tag);
             if (info.isEmpty() && !Obj->Label2.getStrValue().empty())
diff --git a/src/Gui/ViewParams.h b/src/Gui/ViewParams.h
index c558d1b9326e..2d85732eca0a 100644
--- a/src/Gui/ViewParams.h
+++ b/src/Gui/ViewParams.h
@@ -269,7 +269,7 @@ class GuiExport ViewParams: public ParameterGrp::ObserverType {
     FC_VIEW_PARAM(ColorRecompute, bool, Bool, true, \
         QT_TRANSLATE_NOOP("ViewParams","Recompute affected object(s) after editing color."))\
     FC_VIEW_PARAM(SortWBList, bool, Bool, true, \
-        QT_TRANSLATE_NOOP("ViewParams","Sort workbench entires by their names in the combo box."))\
+        QT_TRANSLATE_NOOP("ViewParams","Sort workbench entries by their names in the combo box."))\
     FC_VIEW_PARAM(MaxCameraAnimatePeriod, int, Int, 3000, \
         QT_TRANSLATE_NOOP("ViewParams","Maximum camera move animation duration in milliseconds."))\
     FC_VIEW_PARAM(TaskNoWheelFocus, bool, Bool, true, \
diff --git a/src/Mod/Part/App/TopoShapeEx.cpp b/src/Mod/Part/App/TopoShapeEx.cpp
index 0013b8044689..645e59d1751d 100644
--- a/src/Mod/Part/App/TopoShapeEx.cpp
+++ b/src/Mod/Part/App/TopoShapeEx.cpp
@@ -4173,11 +4173,11 @@ TopoShape TopoShape::splitWires(std::vector<TopoShape> *inner,
     }
 
     auto doReorient = [](TopoShape &s, TopAbs_Orientation orient) {
-        // Speical case of single edge wire. Make sure the edge is in the
+        // Special case of single edge wire. Make sure the edge is in the
         // required orientation. This is necessary because BRepFill_OffsetWire
-        // has special handling of cicular edge offset, which seem to only
+        // has special handling of circular edge offset, which seem to only
         // respect the edge orientation and disregard the wire orientation. The
-        // orientation is used to determin whether to shrink or expand.
+        // orientation is used to determine whether to shrink or expand.
         if (s.countSubShapes(TopAbs_EDGE) == 1) {
             TopoDS_Shape e = s.getSubShape(TopAbs_EDGE, 1);
             if (e.Orientation() == orient) {
diff --git a/src/Mod/Part/Gui/SoBrepEdgeSet.cpp b/src/Mod/Part/Gui/SoBrepEdgeSet.cpp
index 0c883961633c..60b3e2e99156 100644
--- a/src/Mod/Part/Gui/SoBrepEdgeSet.cpp
+++ b/src/Mod/Part/Gui/SoBrepEdgeSet.cpp
@@ -291,7 +291,7 @@ void SoBrepEdgeSet::glRender(SoGLRenderAction *action, bool inpath)
             SoColorPacker packer;
             float trans = 0.0;
 
-            // SoFCDisplayModeElement::getTransparency() specifices face only
+            // SoFCDisplayModeElement::getTransparency() specifies face only
             // transparency. When there is a face only transparency, we'll make
             // edge/point rendering to be opque. Maybe we'll add support for
             // edge/point transparency in SoFCDisplayModeElement later.
diff --git a/src/Mod/Part/Gui/SoBrepPointSet.cpp b/src/Mod/Part/Gui/SoBrepPointSet.cpp
index 419d11f60ee3..b0d152cb2c5f 100644
--- a/src/Mod/Part/Gui/SoBrepPointSet.cpp
+++ b/src/Mod/Part/Gui/SoBrepPointSet.cpp
@@ -226,7 +226,7 @@ void SoBrepPointSet::glRender(SoGLRenderAction *action, bool inpath)
 
         state->push();
 
-        // SoFCDisplayModeElement::getTransparency() specifices face only
+        // SoFCDisplayModeElement::getTransparency() specifies face only
         // transparency. When there is a face only transparency, we'll make
         // edge/point rendering to be opque. Maybe we'll add support for
         // edge/point transparency in SoFCDisplayModeElement later.
diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
index c9001a93a565..4bd581b13315 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -4015,7 +4015,7 @@ void ViewProviderSketch::draw(bool temp /*=false*/, bool rebuildinformationlayer
     assert(edit);
 
     // delay drawing until setEditViewer() where edit->viewer is set.
-    // Because of possible external editing, we can only know the editting
+    // Because of possible external editing, we can only know the editing
     // viewer in setEditViewer().
     if (!edit->viewer)
         return;