diff --git a/doc/source/command-objects/security-group-rule.rst b/doc/source/command-objects/security-group-rule.rst
index ce2e4d346..ec03644e9 100644
--- a/doc/source/command-objects/security-group-rule.rst
+++ b/doc/source/command-objects/security-group-rule.rst
@@ -62,7 +62,7 @@ List security group rules
 .. code:: bash
 
     os security group rule list
-        <group>
+        [<group>]
 
 .. describe:: <group>
 
diff --git a/openstackclient/compute/v2/security_group.py b/openstackclient/compute/v2/security_group.py
index a514085b0..42581d557 100644
--- a/openstackclient/compute/v2/security_group.py
+++ b/openstackclient/compute/v2/security_group.py
@@ -278,6 +278,7 @@ class ListSecurityGroupRule(lister.Lister):
         parser.add_argument(
             'group',
             metavar='<group>',
+            nargs='?',
             help='List all rules in this security group (name or ID)',
         )
         return parser
@@ -286,19 +287,6 @@ class ListSecurityGroupRule(lister.Lister):
         self.log.debug("take_action(%s)", parsed_args)
 
         compute_client = self.app.client_manager.compute
-        group = utils.find_resource(
-            compute_client.security_groups,
-            parsed_args.group,
-        )
-
-        # Argh, the rules are not Resources...
-        rules = []
-        for rule in group.rules:
-            rules.append(security_group_rules.SecurityGroupRule(
-                compute_client.security_group_rules,
-                _xform_security_group_rule(rule),
-            ))
-
         columns = column_headers = (
             "ID",
             "IP Protocol",
@@ -306,6 +294,28 @@ class ListSecurityGroupRule(lister.Lister):
             "Port Range",
             "Remote Security Group",
         )
+
+        rules_to_list = []
+        if parsed_args.group:
+            group = utils.find_resource(
+                compute_client.security_groups,
+                parsed_args.group,
+            )
+            rules_to_list = group.rules
+        else:
+            columns = columns + ('parent_group_id',)
+            column_headers = column_headers + ('Security Group',)
+            for group in compute_client.security_groups.list():
+                rules_to_list.extend(group.rules)
+
+        # Argh, the rules are not Resources...
+        rules = []
+        for rule in rules_to_list:
+            rules.append(security_group_rules.SecurityGroupRule(
+                compute_client.security_group_rules,
+                _xform_security_group_rule(rule),
+            ))
+
         return (column_headers,
                 (utils.get_item_properties(
                     s, columns,
diff --git a/openstackclient/tests/compute/v2/test_security_group_rule.py b/openstackclient/tests/compute/v2/test_security_group_rule.py
index cfe3d46e5..0e7ee05d8 100644
--- a/openstackclient/tests/compute/v2/test_security_group_rule.py
+++ b/openstackclient/tests/compute/v2/test_security_group_rule.py
@@ -68,6 +68,28 @@ SECURITY_GROUP = {
               SECURITY_GROUP_RULE_REMOTE_GROUP],
 }
 
+security_group_2_id = '12'
+security_group_2_name = 'he-shoots'
+security_group_2_description = 'he scores'
+
+SECURITY_GROUP_2_RULE = {
+    'id': '2',
+    'group': {},
+    'ip_protocol': 'tcp',
+    'ip_range': {},
+    'parent_group_id': security_group_2_id,
+    'from_port': 80,
+    'to_port': 80,
+}
+
+SECURITY_GROUP_2 = {
+    'id': security_group_2_id,
+    'name': security_group_2_name,
+    'description': security_group_2_description,
+    'tenant_id': identity_fakes.project_id,
+    'rules': [SECURITY_GROUP_2_RULE],
+}
+
 
 class FakeSecurityGroupRuleResource(fakes.FakeResource):
 
@@ -383,12 +405,22 @@ class TestSecurityGroupRuleList(TestSecurityGroupRule):
     def setUp(self):
         super(TestSecurityGroupRuleList, self).setUp()
 
-        self.secgroups_mock.get.return_value = FakeSecurityGroupRuleResource(
+        security_group_mock = FakeSecurityGroupRuleResource(
             None,
             copy.deepcopy(SECURITY_GROUP),
             loaded=True,
         )
 
+        security_group_2_mock = FakeSecurityGroupRuleResource(
+            None,
+            copy.deepcopy(SECURITY_GROUP_2),
+            loaded=True,
+        )
+
+        self.secgroups_mock.get.return_value = security_group_mock
+        self.secgroups_mock.list.return_value = [security_group_mock,
+                                                 security_group_2_mock]
+
         # Get the command object to test
         self.cmd = security_group.ListSecurityGroupRule(self.app, None)
 
@@ -420,18 +452,64 @@ class TestSecurityGroupRuleList(TestSecurityGroupRule):
             security_group_rule_cidr,
             '0:0',
             '',
-            ), (
+        ), (
             security_group_rule_id,
             'icmp',
             security_group_rule_cidr,
             '',
             '',
-            ), (
+        ), (
             security_group_rule_id,
             'tcp',
             '',
             '80:80',
             'default',
-            ),
-        )
+        ),)
+        self.assertEqual(datalist, tuple(data))
+
+    def test_security_group_rule_list_no_group(self):
+
+        parsed_args = self.check_parser(self.cmd, [], [])
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        collist = (
+            'ID',
+            'IP Protocol',
+            'IP Range',
+            'Port Range',
+            'Remote Security Group',
+            'Security Group',
+        )
+        self.assertEqual(collist, columns)
+        datalist = ((
+            security_group_rule_id,
+            'tcp',
+            security_group_rule_cidr,
+            '0:0',
+            '',
+            security_group_id,
+        ), (
+            security_group_rule_id,
+            'icmp',
+            security_group_rule_cidr,
+            '',
+            '',
+            security_group_id,
+        ), (
+            security_group_rule_id,
+            'tcp',
+            '',
+            '80:80',
+            'default',
+            security_group_id,
+        ), (
+            '2',
+            'tcp',
+            '',
+            '80:80',
+            '',
+            security_group_2_id,
+        ),)
         self.assertEqual(datalist, tuple(data))