diff --git a/django/contrib/auth/forms.py b/django/contrib/auth/forms.py
index 1bcc52d4e80..0711a1d3d84 100644
--- a/django/contrib/auth/forms.py
+++ b/django/contrib/auth/forms.py
@@ -261,8 +261,8 @@ class PasswordResetForm(forms.Form):
 
 class SetPasswordForm(forms.Form):
     """
-    A form that lets a user change set his/her password without entering the
-    old password
+    A form that lets a user change set their password without entering the old
+    password
     """
     error_messages = {
         'password_mismatch': _("The two password fields didn't match."),
@@ -296,8 +296,8 @@ class SetPasswordForm(forms.Form):
 
 class PasswordChangeForm(SetPasswordForm):
     """
-    A form that lets a user change his/her password by entering
-    their old password.
+    A form that lets a user change their password by entering their old
+    password.
     """
     error_messages = dict(SetPasswordForm.error_messages, **{
         'password_incorrect': _("Your old password was entered incorrectly. "
diff --git a/django/contrib/auth/models.py b/django/contrib/auth/models.py
index 94830ef00ff..cfb88455f2d 100644
--- a/django/contrib/auth/models.py
+++ b/django/contrib/auth/models.py
@@ -308,7 +308,7 @@ class PermissionsMixin(models.Model):
     groups = models.ManyToManyField(Group, verbose_name=_('groups'),
         blank=True, help_text=_('The groups this user belongs to. A user will '
                                 'get all permissions granted to each of '
-                                'his/her group.'),
+                                'their group.'),
         related_name="user_set", related_query_name="user")
     user_permissions = models.ManyToManyField(Permission,
         verbose_name=_('user permissions'), blank=True,
@@ -320,7 +320,7 @@ class PermissionsMixin(models.Model):
 
     def get_group_permissions(self, obj=None):
         """
-        Returns a list of permission strings that this user has through his/her
+        Returns a list of permission strings that this user has through their
         groups. This method queries all available auth backends. If an object
         is passed in, only permissions matching this object are returned.
         """
diff --git a/docs/internals/contributing/committing-code.txt b/docs/internals/contributing/committing-code.txt
index 72d0187cea9..5de2ef0378d 100644
--- a/docs/internals/contributing/committing-code.txt
+++ b/docs/internals/contributing/committing-code.txt
@@ -228,7 +228,7 @@ another committer, **before** you commit it in the first place!
 
 When a mistaken commit is discovered, please follow these guidelines:
 
-* If possible, have the original author revert his/her own commit.
+* If possible, have the original author revert their own commit.
 
 * Don't revert another author's changes without permission from the
   original author.
diff --git a/docs/ref/contrib/auth.txt b/docs/ref/contrib/auth.txt
index 37746c392d3..621538420d2 100644
--- a/docs/ref/contrib/auth.txt
+++ b/docs/ref/contrib/auth.txt
@@ -168,7 +168,7 @@ Methods
 
     .. method:: get_group_permissions(obj=None)
 
-        Returns a set of permission strings that the user has, through his/her
+        Returns a set of permission strings that the user has, through their
         groups.
 
         If ``obj`` is passed in, only returns the group permissions for
diff --git a/docs/topics/auth/customizing.txt b/docs/topics/auth/customizing.txt
index be065e4757f..516ae064c4e 100644
--- a/docs/topics/auth/customizing.txt
+++ b/docs/topics/auth/customizing.txt
@@ -819,7 +819,7 @@ methods and attributes:
 
     .. method:: models.PermissionsMixin.get_group_permissions(obj=None)
 
-        Returns a set of permission strings that the user has, through his/her
+        Returns a set of permission strings that the user has, through their
         groups.
 
         If ``obj`` is passed in, only returns the group permissions for
diff --git a/docs/topics/auth/default.txt b/docs/topics/auth/default.txt
index 49e7117f0b6..5479ac469f8 100644
--- a/docs/topics/auth/default.txt
+++ b/docs/topics/auth/default.txt
@@ -1225,7 +1225,7 @@ provides several built-in forms located in :mod:`django.contrib.auth.forms`:
 
 .. class:: SetPasswordForm
 
-    A form that lets a user change his/her password without entering the old
+    A form that lets a user change their password without entering the old
     password.
 
 .. class:: UserChangeForm
@@ -1243,7 +1243,7 @@ provides several built-in forms located in :mod:`django.contrib.auth.forms`:
 Authentication data in templates
 --------------------------------
 
-The currently logged-in user and his/her permissions are made available in the
+The currently logged-in user and their permissions are made available in the
 :doc:`template context </ref/templates/api>` when you use
 :class:`~django.template.RequestContext`.