diff --git a/cMake/FreeCAD_Helpers/SetupQt.cmake b/cMake/FreeCAD_Helpers/SetupQt.cmake
index 230d4198a0..8a1d76c253 100644
--- a/cMake/FreeCAD_Helpers/SetupQt.cmake
+++ b/cMake/FreeCAD_Helpers/SetupQt.cmake
@@ -3,7 +3,7 @@
 find_package(Qt5Core REQUIRED)
 set(CMAKE_AUTOMOC TRUE)
 
-# For FreeCAD 0.20, pegged to Ubutu 18.04 LTS:
+# For FreeCAD 0.20, pegged to Ubuntu 18.04 LTS:
 if(${Qt5Core_VERSION} VERSION_LESS "5.9")
     message (FATAL_ERROR "FreeCAD v0.20 requires Qt5 5.9 or later")
 endif()
diff --git a/src/App/DocumentObserver.h b/src/App/DocumentObserver.h
index b93373ae2b..1cde5f51d5 100644
--- a/src/App/DocumentObserver.h
+++ b/src/App/DocumentObserver.h
@@ -222,7 +222,7 @@ private:
 };
 
 /**
- * The PropertyLinkT class is a helper class to create Python statements for proprty links.
+ * The PropertyLinkT class is a helper class to create Python statements for property links.
  */
 class AppExport PropertyLinkT
 {
diff --git a/src/Gui/Application.cpp b/src/Gui/Application.cpp
index eb3ef7a271..5c27fa2436 100644
--- a/src/Gui/Application.cpp
+++ b/src/Gui/Application.cpp
@@ -2326,7 +2326,7 @@ void Application::runApplication(void)
     }
     catch (...) {
         // catching nasty stuff coming out of the event loop
-        Base::Console().Error("Event loop left through unknwown unhandled exception\n");
+        Base::Console().Error("Event loop left through unknown unhandled exception\n");
         App::Application::destructObserver();
         throw;
     }
diff --git a/src/Gui/DAGView/DAGModel.cpp b/src/Gui/DAGView/DAGModel.cpp
index d299c0a14a..49521a8b23 100644
--- a/src/Gui/DAGView/DAGModel.cpp
+++ b/src/Gui/DAGView/DAGModel.cpp
@@ -383,7 +383,7 @@ void Model::selectionChanged(const SelectionChanges& msg)
     }
   };
   
-  //lamda for clearing selections.
+  //lambda for clearing selections.
   auto clearSelection = [this, highlightConnectorOff]()
   {
     BGL_FORALL_VERTICES(currentVertex, *theGraph, Graph)
@@ -395,7 +395,7 @@ void Model::selectionChanged(const SelectionChanges& msg)
     }
   };
   
-  //lamda for getting rectangle.
+  //lambda for getting rectangle.
   auto getRectangle = [this](const char *in)
   {
     assert(in);
diff --git a/src/Gui/ViewProviderDragger.cpp b/src/Gui/ViewProviderDragger.cpp
index bf2bc001e1..8c5229a2c2 100644
--- a/src/Gui/ViewProviderDragger.cpp
+++ b/src/Gui/ViewProviderDragger.cpp
@@ -286,7 +286,7 @@ void ViewProviderDragger::updatePlacementFromDragger(ViewProviderDragger* sudoTh
     return;
   assert(numberOfFieldChanged == 1);
 
-  //helper lamdas.
+  //helper lambdas.
   auto getVectorX = [&pMatrix]() {return Base::Vector3d(pMatrix[0], pMatrix[4], pMatrix[8]);};
   auto getVectorY = [&pMatrix]() {return Base::Vector3d(pMatrix[1], pMatrix[5], pMatrix[9]);};
   auto getVectorZ = [&pMatrix]() {return Base::Vector3d(pMatrix[2], pMatrix[6], pMatrix[10]);};
diff --git a/src/Mod/Path/App/AreaParams.h b/src/Mod/Path/App/AreaParams.h
index 43eaec676c..55a96ec762 100644
--- a/src/Mod/Path/App/AreaParams.h
+++ b/src/Mod/Path/App/AreaParams.h
@@ -112,7 +112,7 @@
 	((double,angle,Angle,45,"Pattern angle in degree",App::PropertyAngle))\
 	((double,angle_shift,AngleShift,0.0,"Pattern angle shift for each section", App::PropertyAngle))\
 	((double,shift,Shift,0.0,"Pattern shift distance for each section.\n"\
-        "The pocket patter will be shifted in orthogonal direction by this amount for each section.\n"\
+        "The pocket pattern will be shifted in orthogonal direction by this amount for each section.\n"\
         "This gives a 3D pattern mainly for 3D printing. The shift only applies to 'Offset', 'Grid'\n"\
         "and 'Triangle'", App::PropertyDistance))
 
diff --git a/src/Mod/TechDraw/App/Preferences.cpp b/src/Mod/TechDraw/App/Preferences.cpp
index 8080e39ade..f3a3c02601 100644
--- a/src/Mod/TechDraw/App/Preferences.cpp
+++ b/src/Mod/TechDraw/App/Preferences.cpp
@@ -40,7 +40,7 @@
 #include "Preferences.h"
 
 //getters for parameters used in multiple places.
-//ensure this is in sync with preference page uis
+//ensure this is in sync with preference page user interfaces
 
 using namespace TechDraw;
 
diff --git a/src/Mod/TechDraw/Gui/PreferencesGui.cpp b/src/Mod/TechDraw/Gui/PreferencesGui.cpp
index aa6ba842bf..52cedba0b3 100644
--- a/src/Mod/TechDraw/Gui/PreferencesGui.cpp
+++ b/src/Mod/TechDraw/Gui/PreferencesGui.cpp
@@ -41,7 +41,7 @@
 #include "PreferencesGui.h"
 
 //getters for parameters used in multiple places.
-//ensure this is in sync with preference page uis
+//ensure this is in sync with preference page user interfaces
 
 using namespace TechDrawGui;
 using namespace TechDraw;