diff --git a/tests/modeltests/update_only_fields/tests.py b/tests/modeltests/update_only_fields/tests.py
index 9ca0f968d1..97c05ddc79 100644
--- a/tests/modeltests/update_only_fields/tests.py
+++ b/tests/modeltests/update_only_fields/tests.py
@@ -207,6 +207,9 @@ class UpdateOnlyFieldsTests(TestCase):
         self.assertEqual(len(post_save_data[0]), 1)
         self.assertTrue('name' in post_save_data[0])
 
+        pre_save.disconnect(pre_save_receiver)
+        post_save.disconnect(post_save_receiver)
+
     def test_update_fields_incorrect_params(self):
         s = Person.objects.create(name='Sara', gender='F')
 
@@ -233,6 +236,9 @@ class UpdateOnlyFieldsTests(TestCase):
         self.assertEqual(len(pre_save_data), 0)
         self.assertEqual(len(post_save_data), 0)
 
+        pre_save.disconnect(pre_save_receiver)
+        post_save.disconnect(post_save_receiver)
+
     def test_num_queries_inheritance(self):
         s = Employee.objects.create(name='Sara', gender='F')
         s.employee_num = 1
diff --git a/tests/regressiontests/comment_tests/tests/moderation_view_tests.py b/tests/regressiontests/comment_tests/tests/moderation_view_tests.py
index 0abeff9687..c932fed2d2 100644
--- a/tests/regressiontests/comment_tests/tests/moderation_view_tests.py
+++ b/tests/regressiontests/comment_tests/tests/moderation_view_tests.py
@@ -93,6 +93,8 @@ class FlagViewTests(CommentTestCase):
         self.testFlagPost()
         self.assertEqual(received_signals, [signals.comment_was_flagged])
 
+        signals.comment_was_flagged.disconnect(receive)
+
 def makeModerator(username):
     u = User.objects.get(username=username)
     ct = ContentType.objects.get_for_model(Comment)
@@ -164,6 +166,8 @@ class DeleteViewTests(CommentTestCase):
         self.testDeletePost()
         self.assertEqual(received_signals, [signals.comment_was_flagged])
 
+        signals.comment_was_flagged.disconnect(receive)
+
     def testDeletedView(self):
         comments = self.createSomeComments()
         pk = comments[0].pk
@@ -239,6 +243,8 @@ class ApproveViewTests(CommentTestCase):
         self.testApprovePost()
         self.assertEqual(received_signals, [signals.comment_was_flagged])
 
+        signals.comment_was_flagged.disconnect(receive)
+
     def testApprovedView(self):
         comments = self.createSomeComments()
         pk = comments[0].pk
diff --git a/tests/regressiontests/multiple_database/tests.py b/tests/regressiontests/multiple_database/tests.py
index a79c9c0aa1..2bff7b3b66 100644
--- a/tests/regressiontests/multiple_database/tests.py
+++ b/tests/regressiontests/multiple_database/tests.py
@@ -1761,6 +1761,11 @@ class SignalTests(TestCase):
         self.assertEqual(pre_delete_receiver._database, "other")
         self.assertEqual(post_delete_receiver._database, "other")
 
+        signals.pre_save.disconnect(sender=Person, receiver=pre_save_receiver)
+        signals.post_save.disconnect(sender=Person, receiver=post_save_receiver)
+        signals.pre_delete.disconnect(sender=Person, receiver=pre_delete_receiver)
+        signals.post_delete.disconnect(sender=Person, receiver=post_delete_receiver)
+
     def test_database_arg_m2m(self):
         """
         Test that the m2m_changed signal has a correct database arg (#13552)