diff --git a/django/db/models/query.py b/django/db/models/query.py
index 909f07114b..626eb11b12 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -243,7 +243,7 @@ class QuerySet(object):
 
         skip = None
         if load_fields and not fill_cache:
-            # Some fields have been deferred, so we have to initialise
+            # Some fields have been deferred, so we have to initialize
             # via keyword arguments.
             skip = set()
             init_list = []
diff --git a/django/http/response.py b/django/http/response.py
index 2eb629cb34..532f8ee1e7 100644
--- a/django/http/response.py
+++ b/django/http/response.py
@@ -188,7 +188,7 @@ class HttpResponseBase(six.Iterator):
 
     def __getstate__(self):
         # SimpleCookie is not pickeable with pickle.HIGHEST_PROTOCOL, so we
-        # serialise to a string instead
+        # serialize to a string instead
         state = self.__dict__.copy()
         state['cookies'] = str(state['cookies'])
         return state
diff --git a/django/utils/functional.py b/django/utils/functional.py
index 51bbcf0fc9..bb04573587 100644
--- a/django/utils/functional.py
+++ b/django/utils/functional.py
@@ -260,7 +260,7 @@ class LazyObject(object):
 
     def _setup(self):
         """
-        Must be implemented by subclasses to initialise the wrapped object.
+        Must be implemented by subclasses to initialize the wrapped object.
         """
         raise NotImplementedError('subclasses of LazyObject must provide a _setup() method')
 
diff --git a/tests/properties/tests.py b/tests/properties/tests.py
index 3db8fbf0f8..45443026a3 100644
--- a/tests/properties/tests.py
+++ b/tests/properties/tests.py
@@ -18,7 +18,7 @@ class PropertyTests(TestCase):
         # The "full_name" property hasn't provided a "set" method.
         self.assertRaises(AttributeError, setattr, self.a, 'full_name', 'Paul McCartney')
 
-        # But "full_name_2" has, and it can be used to initialise the class.
+        # But "full_name_2" has, and it can be used to initialize the class.
         a2 = Person(full_name_2='Paul McCartney')
         a2.save()
         self.assertEqual(a2.first_name, 'Paul')