diff --git a/django/contrib/sites/models.py b/django/contrib/sites/models.py
index e22fd4021d..7ee7e091c0 100644
--- a/django/contrib/sites/models.py
+++ b/django/contrib/sites/models.py
@@ -78,6 +78,9 @@ class SiteManager(models.Manager):
         global SITE_CACHE
         SITE_CACHE = {}
 
+    def get_by_natural_key(self, domain):
+        return self.get(domain=domain)
+
 
 @python_2_unicode_compatible
 class Site(models.Model):
@@ -96,6 +99,9 @@ class Site(models.Model):
     def __str__(self):
         return self.domain
 
+    def natural_key(self):
+        return (self.domain,)
+
 
 def clear_site_cache(sender, **kwargs):
     """
diff --git a/docs/releases/1.10.txt b/docs/releases/1.10.txt
index 4f6ff558bc..1f3857ab28 100644
--- a/docs/releases/1.10.txt
+++ b/docs/releases/1.10.txt
@@ -93,7 +93,8 @@ Minor features
 :mod:`django.contrib.sites`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-* ...
+* The :class:`~django.contrib.sites.models.Site` model now supports
+  :ref:`natural keys <topics-serialization-natural-keys>`.
 
 :mod:`django.contrib.staticfiles`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/tests/sites_tests/tests.py b/tests/sites_tests/tests.py
index a5ce7a6779..6bf7ce4d0b 100644
--- a/tests/sites_tests/tests.py
+++ b/tests/sites_tests/tests.py
@@ -179,6 +179,10 @@ class SitesFrameworkTests(TestCase):
         with self.assertRaisesMessage(ValidationError, msg):
             site.validate_unique()
 
+    def test_site_natural_key(self):
+        self.assertEqual(Site.objects.get_by_natural_key(self.site.domain), self.site)
+        self.assertEqual(self.site.natural_key(), (self.site.domain,))
+
 
 class JustOtherRouter(object):
     def allow_migrate(self, db, app_label, **hints):