diff --git a/keystone/identity/backends/ldap/common.py b/keystone/identity/backends/ldap/common.py
index 855ee46ab6..8d632aab74 100644
--- a/keystone/identity/backends/ldap/common.py
+++ b/keystone/identity/backends/ldap/common.py
@@ -1402,8 +1402,24 @@ class BaseLdap(object):
             raise ValueError('"%(attr)s" is not a valid value for'
                              ' "%(attr_name)s"' % {'attr': attr,
                                                    'attr_name': attr_name})
-        return [obj for obj in ldap_result
-                if obj[1].get(attr) and obj[1].get(attr)[0]]
+        result = []
+        # consider attr = "cn" and
+        # ldap_result = [{'uid': ['fake_id1']},
+        #                {'uid': ['fake_id2'], 'cn': ['     ']},
+        #                {'uid': ['fake_id3'], 'cn': ['']},
+        #                {'uid': ['fake_id4'], 'cn': []},
+        #                {'uid': ['fake_id5'], 'cn': ["name"]}]
+        for obj in ldap_result:
+            # ignore ldap object(user/group entry) which has no attr set
+            # in it or whose value is empty list.
+            if obj[1].get(attr):
+                # ignore ldap object whose attr value has empty strings or
+                # contains only whitespaces.
+                if obj[1].get(attr)[0] and obj[1].get(attr)[0].strip():
+                    result.append(obj)
+        # except {'uid': ['fake_id5'], 'cn': ["name"]}, all entries
+        # will be ignored in ldap_result
+        return result
 
     def _ldap_get(self, object_id, ldap_filter=None):
         query = (u'(&(%(id_attr)s=%(id)s)'
diff --git a/keystone/tests/unit/test_backend_ldap.py b/keystone/tests/unit/test_backend_ldap.py
index b83f39a67e..a113566893 100644
--- a/keystone/tests/unit/test_backend_ldap.py
+++ b/keystone/tests/unit/test_backend_ldap.py
@@ -1198,6 +1198,58 @@ class LDAPIdentity(BaseLDAPIdentity):
         # from the resource default.
         self.assertIs(True, user_ref['enabled'])
 
+    @mock.patch.object(common_ldap.KeystoneLDAPHandler, 'connect')
+    @mock.patch.object(common_ldap.KeystoneLDAPHandler, 'search_s')
+    @mock.patch.object(common_ldap.KeystoneLDAPHandler, 'simple_bind_s')
+    def test_filter_ldap_result_by_attr(self, mock_simple_bind_s,
+                                        mock_search_s, mock_connect):
+
+        # Mock the ldap search results to return user entries with
+        # user_name_attribute('sn') value has emptyspaces, emptystring
+        # and attibute itself is not set.
+        mock_search_s.return_value = [(
+            'sn=junk1,dc=example,dc=com',
+            {
+                'cn': [uuid.uuid4().hex],
+                'email': [uuid.uuid4().hex],
+                'sn': ['junk1']
+            }
+        ),
+            (
+            '',
+            {
+                'cn': [uuid.uuid4().hex],
+                'email': [uuid.uuid4().hex],
+            }
+        ),
+            (
+            'sn=,dc=example,dc=com',
+            {
+                'cn': [uuid.uuid4().hex],
+                'email': [uuid.uuid4().hex],
+                'sn': ['']
+            }
+        ),
+            (
+            'sn=   ,dc=example,dc=com',
+            {
+                'cn': [uuid.uuid4().hex],
+                'email': [uuid.uuid4().hex],
+                'sn': ['   ']
+            }
+        )]
+
+        user_api = identity.backends.ldap.UserApi(CONF)
+        user_refs = user_api.get_all()
+        # validate that keystone.identity.backends.ldap.common.BaseLdap.
+        # _filter_ldap_result_by_attr() method filtered the ldap query results
+        # whose name attribute values has emptyspaces, emptystring
+        # and attibute itself is not set.
+        self.assertEqual(1, len(user_refs))
+
+        self.assertEqual('junk1', user_refs[0]['name'])
+        self.assertEqual('sn=junk1,dc=example,dc=com', user_refs[0]['dn'])
+
     @mock.patch.object(common_ldap.BaseLdap, '_ldap_get')
     def test_user_enabled_attribute_handles_expired(self, mock_ldap_get):
         # If using 'passwordisexpired' as enabled attribute, and inverting it,
diff --git a/releasenotes/notes/bug-1727726-0b47608811a2cd16.yaml b/releasenotes/notes/bug-1727726-0b47608811a2cd16.yaml
new file mode 100644
index 0000000000..b10285e881
--- /dev/null
+++ b/releasenotes/notes/bug-1727726-0b47608811a2cd16.yaml
@@ -0,0 +1,9 @@
+---
+fixes:
+  - |
+    [`bug 1727726 <https://bugs.launchpad.net/keystone/+bug/1727726>`_]
+    All users and groups are required to have a name. Prior to this fix,
+    Keystone was allowing LDAP users and groups whose name has only empty
+    white spaces. Keystone will now ignore users and groups that do have
+    only white spaces as value for the LDAP attribute which Keystone has
+    been configured to use for that entity's name.