diff --git a/Filters/AMR/Testing/Cxx/TestAMRGhostLayerStripping.cxx b/Filters/AMR/Testing/Cxx/TestAMRGhostLayerStripping.cxx
index f0bb27e4a12cb19ffde78b23eaf4d97e6879a8ce..a320640a762d0c3697f05663f62a900340ee6708 100644
--- a/Filters/AMR/Testing/Cxx/TestAMRGhostLayerStripping.cxx
+++ b/Filters/AMR/Testing/Cxx/TestAMRGhostLayerStripping.cxx
@@ -208,7 +208,7 @@ vtkUniformGrid* GetGhostedGrid(
     }
   } // END for all dimensions
 
-  // STEP 3: Construt ghosted grid
+  // STEP 3: Construct ghosted grid
   vtkUniformGrid *grid = vtkUniformGrid::New();
   grid->Initialize();
   grid->SetOrigin( origin );
diff --git a/Filters/Core/vtkMultiObjectMassProperties.cxx b/Filters/Core/vtkMultiObjectMassProperties.cxx
index 47a528b8fb7501ae51c28f40dd101bd56ca2f5d9..65b29a43bd3cb804481d52d75861beb60c47eb7b 100644
--- a/Filters/Core/vtkMultiObjectMassProperties.cxx
+++ b/Filters/Core/vtkMultiObjectMassProperties.cxx
@@ -286,7 +286,7 @@ int vtkMultiObjectMassProperties::RequestData(
   output->GetFieldData()->AddArray(this->ObjectValidity);
   unsigned char *valid;
 
-  // All polygons intially assumed oriented properly
+  // All polygons initially assumed oriented properly
   unsigned char *orient = new unsigned char [numPolys];
   std::fill_n(orient, numPolys, 1);
 
diff --git a/Filters/Core/vtkMultiObjectMassProperties.h b/Filters/Core/vtkMultiObjectMassProperties.h
index c7cccad5833d915bf5109b74bf2280391edb42b0..51e939d6432d52262f67d2759b9e1eb573a5e421 100644
--- a/Filters/Core/vtkMultiObjectMassProperties.h
+++ b/Filters/Core/vtkMultiObjectMassProperties.h
@@ -74,7 +74,7 @@
  * operates on triangle meshes and assumes only a single, closed, properly
  * oriented surface is represented. vtkMultiObjectMassProperties performs
  * additional topological and connectivity operations to identify separate
- * objects, and confirms that they are manifold. It also accomodates
+ * objects, and confirms that they are manifold. It also accommodates
  * inconsistent ordering.
  *
  * @warning
diff --git a/Filters/Core/vtkSynchronizedTemplates3D.h b/Filters/Core/vtkSynchronizedTemplates3D.h
index 16359645384f64b99802b8d523f994458037ecd4..97234c91e81c04ca78e6b2882c3296a5aa1957bc 100644
--- a/Filters/Core/vtkSynchronizedTemplates3D.h
+++ b/Filters/Core/vtkSynchronizedTemplates3D.h
@@ -155,7 +155,7 @@ public:
 
   //@{
   /**
-   * Determines the chunk size fro streaming.  This filter will act like a
+   * Determines the chunk size for streaming.  This filter will act like a
    * collector: ask for many input pieces, but generate one output.  Limit is
    * in KBytes
    */
diff --git a/Filters/Geometry/vtkStructuredAMRGridConnectivity.h b/Filters/Geometry/vtkStructuredAMRGridConnectivity.h
index a34f9e927c3e38b9785fd92585aebde583297691..c2b507298db613979f1ad5c1f7e3c6b1e68e8969 100644
--- a/Filters/Geometry/vtkStructuredAMRGridConnectivity.h
+++ b/Filters/Geometry/vtkStructuredAMRGridConnectivity.h
@@ -175,7 +175,7 @@ protected:
       const int gridIdx, int fromLevel, int toLevel, int ext[6]);
 
   /**
-   * Gets the refined extent fro the grid with the given grid index.
+   * Gets the refined extent for the grid with the given grid index.
    */
   void GetRefinedExtent(
       const int gridIdx, int fromLevel, int toLevel, int ext[6]);
diff --git a/Filters/SMP/vtkThreadedSynchronizedTemplates3D.h b/Filters/SMP/vtkThreadedSynchronizedTemplates3D.h
index ef3fb9872e3ee9506babdab246b239d91209f736..917eaff8a6082b1e4de174aa8a2d0035c0219df3 100644
--- a/Filters/SMP/vtkThreadedSynchronizedTemplates3D.h
+++ b/Filters/SMP/vtkThreadedSynchronizedTemplates3D.h
@@ -156,7 +156,7 @@ public:
 
   //@{
   /**
-   * Determines the chunk size fro streaming.  This filter will act like a
+   * Determines the chunk size for streaming.  This filter will act like a
    * collector: ask for many input pieces, but generate one output.  Limit is
    * in KBytes
    */
diff --git a/IO/Geometry/vtkAVSucdReader.cxx b/IO/Geometry/vtkAVSucdReader.cxx
index 8e58fbd10a1685b50d38169eec631b0fdd608d2d..09d2a2873e2e99b19c9cc7619aeb028cc17e8d67 100644
--- a/IO/Geometry/vtkAVSucdReader.cxx
+++ b/IO/Geometry/vtkAVSucdReader.cxx
@@ -315,7 +315,7 @@ int vtkAVSucdReader::RequestInformation(
       vtkDebugMacro( << "TFL = " << trueFileLength
                      << "\tCFL = " << calculatedFileLength << endl);
 
-      // We tried. Count our trys.
+      // We tried. Count our tries.
       attempts++;
 
       if(trueFileLength == calculatedFileLength)
diff --git a/IO/Geometry/vtkWindBladeReader.cxx b/IO/Geometry/vtkWindBladeReader.cxx
index 8e46034f61c9e370093ac56ec4f2c469a85cbb62..808cd010a80d2dcbd729f22b402a9dbe32456d18 100644
--- a/IO/Geometry/vtkWindBladeReader.cxx
+++ b/IO/Geometry/vtkWindBladeReader.cxx
@@ -729,7 +729,7 @@ void vtkWindBladeReader::ReadDataVariables(istream& inStr)
 //
 // Open the first data file and verify that the data is where is should be
 // Each data block is enclosed by two ints which record the number of bytes
-// Save the file offset for each varible
+// Save the file offset for each variable
 //
 //----------------------------------------------------------------------------
 bool vtkWindBladeReader::FindVariableOffsets()
diff --git a/IO/Import/vtkOBJImporterInternals.cxx b/IO/Import/vtkOBJImporterInternals.cxx
index b8e91e7846ec7fa5aaa16d2b6d14f231ff5caede..ac1201d39a6e1f68de03787964a17620924e32a5 100644
--- a/IO/Import/vtkOBJImporterInternals.cxx
+++ b/IO/Import/vtkOBJImporterInternals.cxx
@@ -165,7 +165,7 @@ bool tokenGetVector(size_t &t, std::vector<Token> &tokens,
     vtkGenericWarningMacro("bad syntax");
     return false;
   }
-  // parse the folloing numbers
+  // parse the following numbers
   size_t count = 0;
   while (tokens.size() > t + 2 &&
     tokens[t+1].Type == Token::Space &&
diff --git a/IO/MPIParallel/vtkPWindBladeReader.cxx b/IO/MPIParallel/vtkPWindBladeReader.cxx
index e240ccbcfc3c070ebb593d18ccba9ebe05fd4a87..3df1465421fb4fe7d4d7662c164d70a9385d2910 100644
--- a/IO/MPIParallel/vtkPWindBladeReader.cxx
+++ b/IO/MPIParallel/vtkPWindBladeReader.cxx
@@ -290,7 +290,7 @@ bool vtkPWindBladeReader::ReadGlobalData()
 //
 // Open the first data file and verify that the data is where is should be
 // Each data block is enclosed by two ints which record the number of bytes
-// Save the file offset for each varible
+// Save the file offset for each variable
 //
 //----------------------------------------------------------------------------
 bool vtkPWindBladeReader::FindVariableOffsets()
diff --git a/IO/XML/vtkXMLPTableReader.h b/IO/XML/vtkXMLPTableReader.h
index a33871ce07877fae92432c5a93a52382e5ade200..b675529719f4f3ac5491300948cf710decaa6f1d 100644
--- a/IO/XML/vtkXMLPTableReader.h
+++ b/IO/XML/vtkXMLPTableReader.h
@@ -87,7 +87,7 @@ protected:
   ~vtkXMLPTableReader() override;
 
   /**
-   * Return hte type of the dataset being read
+   * Return the type of the dataset being read
    */
   const char* GetDataSetName() override;
 
diff --git a/IO/Xdmf2/CMakeLists.txt b/IO/Xdmf2/CMakeLists.txt
index f017c9505627e7028d6b3347b24477e8e109bdfb..fcacb3687c344625429a53e100ce1010662a8094 100644
--- a/IO/Xdmf2/CMakeLists.txt
+++ b/IO/Xdmf2/CMakeLists.txt
@@ -7,5 +7,5 @@ set(Module_SRCS
   vtkXdmfWriter.cxx
   )
 
-#set(${vtk-module}_NO_HeaderTest 1) # TODO: helper classes and reenable
+#set(${vtk-module}_NO_HeaderTest 1) # TODO: helper classes and re-enable
 vtk_module_library(vtkIOXdmf2 ${Module_SRCS})
diff --git a/IO/Xdmf2/vtkXdmfWriter.cxx b/IO/Xdmf2/vtkXdmfWriter.cxx
index 03c6e9b7fe3e20e1357ee0ea6177d7211a9d9281..35daeb7814780232e92df36d65b02f2582fcd25d 100644
--- a/IO/Xdmf2/vtkXdmfWriter.cxx
+++ b/IO/Xdmf2/vtkXdmfWriter.cxx
@@ -458,7 +458,7 @@ int vtkXdmfWriter::WriteCompositeDataSet(vtkCompositeDataSet *dobj, xdmf2::XdmfG
   {
     //fine for vtkMultiBlockDataSet
     //vtkHierarchicalBoxDataSet would be better served by a different xdmf tree type
-    //vtkTemporalDataSet is internal to the VTK pipeline so I am ingnoring it
+    //vtkTemporalDataSet is internal to the VTK pipeline so I am ignoring it
     grid->SetGridType(XDMF_GRID_TREE);
   }
 
diff --git a/Rendering/OpenGL2/vtkDepthPeelingPass.h b/Rendering/OpenGL2/vtkDepthPeelingPass.h
index 7fba337ee77c011d04c0188cbcb0b71e10738e7f..2732391e54efe67dfa3c03f45e93bf0f3604d60d 100644
--- a/Rendering/OpenGL2/vtkDepthPeelingPass.h
+++ b/Rendering/OpenGL2/vtkDepthPeelingPass.h
@@ -14,7 +14,7 @@
 =========================================================================*/
 /**
  * @class   vtkDepthPeelingPass
- * @brief   Implement Depth Peeling for use within a frambuffer pass
+ * @brief   Implement Depth Peeling for use within a framebuffer pass
  *
  * Note that this implementation is used as a fallback for drivers that
  * don't support floating point textures. Most renderings will use the subclass
@@ -38,7 +38,7 @@
  * This implementation makes use of textures and is suitable for ES3
  * For ES3 it must be embedded within a pass that makes use of framebuffers
  * so that the required OpaqueZTexture and OpaqueRGBATexture can be
- * passed from the outer frambuffer pass. For OpenGL ES3 be aware the
+ * passed from the outer framebuffer pass. For OpenGL ES3 be aware the
  * occlusion ratio test is not supported. The maximum number of peels
  * is used instead so set it to a reasonable value. For many scenes
  * a value of 4 or 5 will work well.
diff --git a/Rendering/OpenGL2/vtkOpenGLFramebufferObject.h b/Rendering/OpenGL2/vtkOpenGLFramebufferObject.h
index 9e94ce72bee99eaa67d8885f940599779f89b77d..62e1a117f7e1ac9452b85aeeb7382669e8227df7 100644
--- a/Rendering/OpenGL2/vtkOpenGLFramebufferObject.h
+++ b/Rendering/OpenGL2/vtkOpenGLFramebufferObject.h
@@ -339,7 +339,7 @@ public:
   /**
    * Convenience method to populate a framebuffer with
    * attachments created as well. Returns true if a
-   * complete valid Frambuffer was created
+   * complete valid Framebuffer was created
    */
   bool PopulateFramebuffer(int width, int height);
   bool PopulateFramebuffer(
diff --git a/Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx b/Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx
index 00d81161c85f1053515788ae1f42a8215f4b0e1f..cb2d0dfdc17481e1176f53a9950a6da4ef15216a 100644
--- a/Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx
+++ b/Rendering/VolumeOpenGL2/vtkOpenGLGPUVolumeRayCastMapper.cxx
@@ -3345,7 +3345,7 @@ bool vtkOpenGLGPUVolumeRayCastMapper::vtkInternal::UpdateInputs(vtkRenderer* ren
         this->Partitions[2]);
 
       ///TODO Currently, only input arrays with the same name/id/mode can be
-      // (accross input objects) can be rendered. This could be addressed by
+      // (across input objects) can be rendered. This could be addressed by
       // overriding the mapper's settings with array settings defined in the
       // vtkMultiVolume instance.
       vtkDataArray* scalars = this->Parent->GetScalars(input, this->Parent->ScalarMode,
diff --git a/Utilities/PythonInterpreter/vtkPythonInteractiveInterpreter.h b/Utilities/PythonInterpreter/vtkPythonInteractiveInterpreter.h
index 4b42f556dd77a63229ee3eb329ce615b07cec816..57f6b43605b3a4b3ed06d38aa9f9115e3bb29e87 100644
--- a/Utilities/PythonInterpreter/vtkPythonInteractiveInterpreter.h
+++ b/Utilities/PythonInterpreter/vtkPythonInteractiveInterpreter.h
@@ -17,7 +17,7 @@
  * @brief   interpreter for interactive shells.
  *
  * vtkPythonInteractiveInterpreter provides an interpreter that can be used in
- * interactive shells. It mimicks the behaviour of the interactive
+ * interactive shells. It mimics the behaviour of the interactive
  * console (much like the default Python shell) providing the "read-eval-print"
  * loops. It also handles incomplete statements correctly. It uses "code"
  * module provided by Python standard library to achieve this.
diff --git a/Utilities/PythonInterpreter/vtkPythonInterpreter.cxx b/Utilities/PythonInterpreter/vtkPythonInterpreter.cxx
index 10ca69d89146385cc7ef8bdb6e628bd4d1f61489..2d5346f2f2f34de03f3adcfb2dddc8493151495e 100644
--- a/Utilities/PythonInterpreter/vtkPythonInterpreter.cxx
+++ b/Utilities/PythonInterpreter/vtkPythonInterpreter.cxx
@@ -276,7 +276,7 @@ void vtkPythonInterpreter::Finalize()
   {
     NotifyInterpreters(vtkCommand::ExitEvent);
     vtkPythonScopeGilEnsurer gilEnsurer(false, true);
-    // Py_Finalize will take care of relasing gil
+    // Py_Finalize will take care of releasing gil
     Py_Finalize();
   }
 }
@@ -404,7 +404,7 @@ int vtkPythonInterpreter::PyMain(int argc, char** argv)
   return res;
 #else
 
-  // process command line argments to remove unhandled args.
+  // process command line arguments to remove unhandled args.
   std::vector<char*> newargv;
   for (int i=0; i < argc; ++i)
   {
diff --git a/Utilities/octree/octree.h b/Utilities/octree/octree.h
index 50c34f608e1467fa7e9f3a66cb5fe7278ddc4d01..bfc37f35316e9f467034ae4e853d0525762ed932 100644
--- a/Utilities/octree/octree.h
+++ b/Utilities/octree/octree.h
@@ -27,7 +27,7 @@
   * the integers in the vector will all be in \f$\{0,\ldots,2^d-1\}\f$.
   *
   * The octree_cursor class provides a free-form way to visit nodes in the octree;
-  * it does not behave like an interator that guarantees each node will be visited once.
+  * it does not behave like an iterator that guarantees each node will be visited once.
   * Instead, it provides a way to move up, down, and across the tree from any location.
   * This makes it useful for local queries that do not need to traverse the entire tree.
   *