diff --git a/django/contrib/auth/middleware.py b/django/contrib/auth/middleware.py
index cd4254b9b5..4075b856c0 100644
--- a/django/contrib/auth/middleware.py
+++ b/django/contrib/auth/middleware.py
@@ -25,6 +25,6 @@ class AuthenticationMiddleware:
             user_id = request.session[SESSION_KEY]
             request.user = UserWrapper(user_id)
         except KeyError:
-            from django.parts.auth.anonymoususers import AnonymousUser
+            from django.contrib.auth.models import AnonymousUser
             request.user = AnonymousUser()
         return None
diff --git a/django/contrib/auth/models.py b/django/contrib/auth/models.py
index da36e33922..64787e2d62 100644
--- a/django/contrib/auth/models.py
+++ b/django/contrib/auth/models.py
@@ -220,3 +220,48 @@ class Message(models.Model):
 
     def __repr__(self):
         return self.message
+
+class AnonymousUser:
+    id = None
+
+    def __init__(self):
+        pass
+
+    def __repr__(self):
+        return 'AnonymousUser'
+
+    def save(self):
+        raise NotImplementedError
+
+    def delete(self):
+        raise NotImplementedError
+
+    def set_password(self, raw_password):
+        raise NotImplementedError
+
+    def check_password(self, raw_password):
+        raise NotImplementedError
+
+    def get_group_list(self):
+        return []
+
+    def set_groups(self, group_id_list):
+        raise NotImplementedError
+
+    def get_permission_list(self):
+        return []
+
+    def set_permissions(self, permission_id_list):
+        raise NotImplementedError
+
+    def has_perm(self, perm):
+        return False
+
+    def has_module_perms(self, module):
+        return False
+
+    def get_and_delete_messages(self):
+        return []
+
+    def is_anonymous(self):
+        return True
diff --git a/django/parts/auth/anonymoususers.py b/django/parts/auth/anonymoususers.py
deleted file mode 100644
index fea93e2f5a..0000000000
--- a/django/parts/auth/anonymoususers.py
+++ /dev/null
@@ -1,44 +0,0 @@
-class AnonymousUser:
-    id = None
-
-    def __init__(self):
-        pass
-
-    def __repr__(self):
-        return 'AnonymousUser'
-
-    def save(self):
-        raise NotImplementedError
-
-    def delete(self):
-        raise NotImplementedError
-
-    def set_password(self, raw_password):
-        raise NotImplementedError
-
-    def check_password(self, raw_password):
-        raise NotImplementedError
-
-    def get_group_list(self):
-        return []
-
-    def set_groups(self, group_id_list):
-        raise NotImplementedError
-
-    def get_permission_list(self):
-        return []
-
-    def set_permissions(self, permission_id_list):
-        raise NotImplementedError
-
-    def has_perm(self, perm):
-        return False
-
-    def has_module_perms(self, module):
-        return False
-
-    def get_and_delete_messages(self):
-        return []
-
-    def is_anonymous(self):
-        return True
diff --git a/docs/authentication.txt b/docs/authentication.txt
index 81d1a4f52c..8dc7ccc431 100644
--- a/docs/authentication.txt
+++ b/docs/authentication.txt
@@ -192,7 +192,7 @@ the setting and checking of these values behind the scenes.
 Anonymous users
 ---------------
 
-``django.parts.auth.anonymoususers.AnonymousUser`` is a class that implements
+``django.contrib.auth.models.AnonymousUser`` is a class that implements
 the ``django.models.auth.users.User`` interface, with these differences:
 
     * ``id`` is always ``None``.
diff --git a/docs/request_response.txt b/docs/request_response.txt
index 13de013b6c..1566e6d3cf 100644
--- a/docs/request_response.txt
+++ b/docs/request_response.txt
@@ -88,7 +88,7 @@ All attributes except ``session`` should be considered read-only.
 ``user``
     A ``django.models.auth.users.User`` object representing the currently
     logged-in user. If the user isn't currently logged in, ``user`` will be set
-    to an instance of ``django.parts.auth.anonymoususers.AnonymousUser``. You
+    to an instance of ``django.contrib.auth.models.AnonymousUser``. You
     can tell them apart with ``is_anonymous()``, like so::
 
         if request.user.is_anonymous():