diff --git a/src/3rdParty/salomesmesh/src/SMESHDS/SMESHDS_SubMesh.cpp b/src/3rdParty/salomesmesh/src/SMESHDS/SMESHDS_SubMesh.cpp
index 11dbb124a..c927e5c16 100644
--- a/src/3rdParty/salomesmesh/src/SMESHDS/SMESHDS_SubMesh.cpp
+++ b/src/3rdParty/salomesmesh/src/SMESHDS/SMESHDS_SubMesh.cpp
@@ -121,7 +121,7 @@ bool SMESHDS_SubMesh::RemoveElement(const SMDS_MeshElement * ME, bool isElemDele
   }
   if (!IsComplexSubmesh())
   {
-    if ( ME->getshapeId() != myIndex ) // elem not in a pool can loose it's data already
+    if ( ME->getshapeId() != myIndex ) // elem not in a pool can lose its data already
     {
       if ( isElemDeleted )
         for ( size_t i = 0; i < myElements.size(); ++i )
diff --git a/src/App/PropertyFile.cpp b/src/App/PropertyFile.cpp
index f5a1137ff..7ab448af7 100644
--- a/src/App/PropertyFile.cpp
+++ b/src/App/PropertyFile.cpp
@@ -182,7 +182,7 @@ void PropertyFileIncluded::setValue(const char* sFile, const char* sName)
         // directory:
         // When a file is read-only it is supposed to be assigned to a
         // PropertyFileIncluded instance. In this case we must copy the
-        // file because otherwise the above instance looses its data.
+        // file because otherwise the above instance loses its data.
         // If the file is writable it is supposed to be of free use and
         // it can be simply renamed.
 
diff --git a/src/Gui/MDIView.cpp b/src/Gui/MDIView.cpp
index 9567cf96a..c06971703 100644
--- a/src/Gui/MDIView.cpp
+++ b/src/Gui/MDIView.cpp
@@ -178,7 +178,7 @@ void MDIView::closeEvent(QCloseEvent *e)
         }
 
         // Note: When using QMdiArea we must not use removeWindow()
-        // because otherwise the QMdiSubWindow will loose its parent
+        // because otherwise the QMdiSubWindow will lose its parent
         // and thus the notification in QMdiSubWindow::closeEvent of
         // other mdi windows to get maximized if this window
         // is maximized will fail.
diff --git a/src/Gui/MainWindow.cpp b/src/Gui/MainWindow.cpp
index 01002cb27..23074e926 100644
--- a/src/Gui/MainWindow.cpp
+++ b/src/Gui/MainWindow.cpp
@@ -783,7 +783,7 @@ void MainWindow::removeWindow(Gui::MDIView* view)
 
     QWidget* parent = view->parentWidget();
     // The call of 'd->mdiArea->removeSubWindow(parent)' causes the QMdiSubWindow
-    // to loose its parent and thus the notification in QMdiSubWindow::closeEvent
+    // to lose its parent and thus the notification in QMdiSubWindow::closeEvent
     // of other mdi windows to get maximized if this window is maximized will fail.
     // However, we must let it here otherwise deleting MDI child views directly can
     // cause other problems.
diff --git a/src/Gui/ProgressBar.h b/src/Gui/ProgressBar.h
index 0bdc70074..d99439cae 100644
--- a/src/Gui/ProgressBar.h
+++ b/src/Gui/ProgressBar.h
@@ -175,7 +175,7 @@ private:
     void resetObserveEventFilter();
     /** Gets the events under control */
     void enterControlEvents();
-    /** Looses the control over incoming events*/
+    /** Loses the control over incoming events*/
     void leaveControlEvents();
     //@}
     ProgressBarPrivate* d;
diff --git a/src/Gui/Selection.cpp b/src/Gui/Selection.cpp
index 8f0b726a4..3e9bac496 100644
--- a/src/Gui/Selection.cpp
+++ b/src/Gui/Selection.cpp
@@ -382,7 +382,7 @@ std::vector<SelectionObject> SelectionSingleton::getSelectionEx(const char* pDoc
         }
     }
 
-    // The map looses the order thus we have to go again through the list and pick up the SelectionObject from the map
+    // The map loses the order thus we have to go again through the list and pick up the SelectionObject from the map
     for (std::list<_SelObj>::const_iterator It = _SelList.begin();It != _SelList.end();++It) {
         std::map<App::DocumentObject*,SelectionObject>::iterator Jt = SortMap.find(It->pObject);
         if (Jt != SortMap.end()) {
diff --git a/src/Gui/TextEdit.cpp b/src/Gui/TextEdit.cpp
index b3f19b0e6..932c2f7dc 100644
--- a/src/Gui/TextEdit.cpp
+++ b/src/Gui/TextEdit.cpp
@@ -156,7 +156,7 @@ void TextEdit::complete()
 
 /**
  * Creates the listbox containing all possibilities for the completion.
- * The listbox is closed when ESC is pressed, the text edit field looses focus or a
+ * The listbox is closed when ESC is pressed, the text edit field loses focus or a
  * mouse button was pressed.
  */
 void TextEdit::createListBox()
diff --git a/src/Gui/View3DInventor.cpp b/src/Gui/View3DInventor.cpp
index 0c29a3503..a6e7b2cfc 100644
--- a/src/Gui/View3DInventor.cpp
+++ b/src/Gui/View3DInventor.cpp
@@ -974,7 +974,7 @@ void View3DInventor::setCurrentViewMode(ViewMode newmode)
     // be avoided because when two or more windows are either in 'TopLevel' or 'Fullscreen'
     // mode only the last window gets all key event even if it is not the active one.
     //
-    // It is important to set the focus proxy to get all key events otherwise we would loose
+    // It is important to set the focus proxy to get all key events otherwise we would lose
     // control after redirecting the first key event to the GL widget.
     if (oldmode == Child) {
         // To make a global shortcut working from this window we need to add
diff --git a/src/Gui/ViewProvider.h b/src/Gui/ViewProvider.h
index 27de3423e..7cc0f886e 100644
--- a/src/Gui/ViewProvider.h
+++ b/src/Gui/ViewProvider.h
@@ -255,7 +255,7 @@ public:
 protected:
     /// is called by the document when the provider goes in edit mode
     virtual bool setEdit(int ModNum);
-    /// is called when you loose the edit mode
+    /// is called when you lose the edit mode
     virtual void unsetEdit(int ModNum);
     /// return the edit mode or -1 if nothing is being edited
     int getEditingMode() const;
diff --git a/src/Gui/ViewProviderPythonFeature.h b/src/Gui/ViewProviderPythonFeature.h
index 900a63ec8..cb4402bb1 100644
--- a/src/Gui/ViewProviderPythonFeature.h
+++ b/src/Gui/ViewProviderPythonFeature.h
@@ -387,7 +387,7 @@ protected:
         if (!ok) ok = ViewProviderT::setEdit(ModNum);
         return ok;
     }
-    /// is called when you loose the edit mode
+    /// is called when you lose the edit mode
     virtual void unsetEdit(int ModNum)
     {
         bool ok = imp->unsetEdit(ModNum);
diff --git a/src/Gui/propertyeditor/PropertyItem.cpp b/src/Gui/propertyeditor/PropertyItem.cpp
index 4bade8509..918c34cfc 100644
--- a/src/Gui/propertyeditor/PropertyItem.cpp
+++ b/src/Gui/propertyeditor/PropertyItem.cpp
@@ -1898,7 +1898,7 @@ void PropertyPlacementItem::setValue(const QVariant& value)
     if (!value.canConvert<Base::Placement>())
         return;
     // Accept this only if the user changed the axis, angle or position but
-    // not if >this< item looses focus
+    // not if >this< item loses focus
     if (!changed_value)
         return;
     changed_value = false;