diff --git a/io_mesh_ply/export_ply.py b/io_mesh_ply/export_ply.py
index 2b58186b3410e3da97a757d180497838cfc1a179..60d9b7ea3b8ff0f9e268676857da9c1c2d42da74 100644
--- a/io_mesh_ply/export_ply.py
+++ b/io_mesh_ply/export_ply.py
@@ -20,7 +20,7 @@
 
 """
 This script exports Stanford PLY files from Blender. It supports normals,
-colours, and texture coordinates per face or per vertex.
+colors, and texture coordinates per face or per vertex.
 Only one mesh can be exported at a time.
 """
 
diff --git a/io_scene_obj/export_obj.py b/io_scene_obj/export_obj.py
index 017080907035cfe1143bdb19591d7ad9aa04b450..8a3978ca8abb0667b8979bbae7f229712e1ba9ae 100644
--- a/io_scene_obj/export_obj.py
+++ b/io_scene_obj/export_obj.py
@@ -72,7 +72,7 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
             fw('Ns %.6f\n' % tspec)
             del tspec
 
-            fw('Ka %.6f %.6f %.6f\n' % (mat.ambient * world_amb)[:])  # Ambient, uses mirror colour,
+            fw('Ka %.6f %.6f %.6f\n' % (mat.ambient * world_amb)[:])  # Ambient, uses mirror color,
             fw('Kd %.6f %.6f %.6f\n' % (mat.diffuse_intensity * mat.diffuse_color)[:])  # Diffuse
             fw('Ks %.6f %.6f %.6f\n' % (mat.specular_intensity * mat.specular_color)[:])  # Specular
             if hasattr(mat, "ior"):
@@ -92,7 +92,7 @@ def write_mtl(scene, filepath, path_mode, copy_set, mtl_dict):
         else:
             #write a dummy material here?
             fw('Ns 0\n')
-            fw('Ka %.6f %.6f %.6f\n' % world_amb[:])  # Ambient, uses mirror colour,
+            fw('Ka %.6f %.6f %.6f\n' % world_amb[:])  # Ambient, uses mirror color,
             fw('Kd 0.8 0.8 0.8\n')
             fw('Ks 0.8 0.8 0.8\n')
             fw('d 1\n')  # No alpha
diff --git a/render_povray/render.py b/render_povray/render.py
index b6aad6c49b8ca983def07d87407e80a67fe57fa2..a009c9d5887947570cad0da77ce4d27972d4e969 100644
--- a/render_povray/render.py
+++ b/render_povray/render.py
@@ -567,7 +567,7 @@ def write_pov(filename, scene=None, info_callback=None):
 
             matrix = global_matrix * ob.matrix_world
 
-            # Colour is modified by energy #muiltiplie by 2 for a better match --Maurice
+            # Color is modified by energy #muiltiplie by 2 for a better match --Maurice
             color = tuple([c * lamp.energy * 2.0 for c in lamp.color])
 
             tabWrite("light_source {\n")
@@ -934,8 +934,8 @@ def write_pov(filename, scene=None, info_callback=None):
             file.write("\n")
             tabWrite("}\n")
 
-            # Vertex colours
-            vertCols = {}  # Use for material colours also.
+            # Vertex colors
+            vertCols = {}  # Use for material colors also.
 
             if uv_layer:
                 # Generate unique UV's
@@ -1012,7 +1012,7 @@ def write_pov(filename, scene=None, info_callback=None):
                                 vertCols[key] = [-1]
 
             else:
-                # No vertex colours, so write material colours as vertex colours
+                # No vertex colors, so write material colors as vertex colors
                 for i, material in enumerate(me_materials):
 
                     if material:
@@ -1026,7 +1026,7 @@ def write_pov(filename, scene=None, info_callback=None):
                             key = diffuse_color[0], diffuse_color[1], diffuse_color[2], i  # i == f.mat
                             vertCols[key] = [-1]
 
-            # Vert Colours
+            # Vert Colors
             tabWrite("texture_list {\n")
             file.write(tabStr + "%s" % (len(vertCols)))  # vert count
             idx = 0
@@ -1426,7 +1426,7 @@ def write_pov(filename, scene=None, info_callback=None):
                     material = me_materials[material_index]
                     for i1, i2, i3 in indices:
                         if me.vertex_colors and material.use_vertex_color_paint:
-                            # Colour per vertex - vertex colour
+                            # Color per vertex - vertex color
 
                             col1 = cols[i1]
                             col2 = cols[i2]
@@ -1436,7 +1436,7 @@ def write_pov(filename, scene=None, info_callback=None):
                             ci2 = vertCols[col2[0], col2[1], col2[2], material_index][0]
                             ci3 = vertCols[col3[0], col3[1], col3[2], material_index][0]
                         else:
-                            # Colour per material - flat material colour
+                            # Color per material - flat material color
                             if material.subsurface_scattering.use:
                                 diffuse_color = [i * j for i, j in zip(material.subsurface_scattering.color[:], material.diffuse_color[:])]
                             else: