diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index ab59060da5..da74e092f5 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -1605,6 +1605,24 @@ is_admin_only:
   in: body
   required: true
   type: boolean
+is_default_type:
+  description: |
+    Defines the share type created is default or not. If the returning
+    value is true, then it is the default share type, otherwise, it is
+    not default.
+  in: body
+  required: true
+  type: boolean
+  min_version: 2.46
+is_group_type_default:
+  description: |
+    Defines the share group type created is default or not. If the
+    returning value is true, then it is the default share group type,
+    otherwise, it is not default.
+  in: body
+  required: true
+  type: boolean
+  min_version: 2.46
 is_public:
   description: |
     (Since API v2.8) The level of visibility for the
diff --git a/api-ref/source/samples/share-group-type-create-response.json b/api-ref/source/samples/share-group-type-create-response.json
index a4b8464aaf..cfb19b4392 100644
--- a/api-ref/source/samples/share-group-type-create-response.json
+++ b/api-ref/source/samples/share-group-type-create-response.json
@@ -4,6 +4,7 @@
         "group_specs": {},
         "share_types": ["ecd11f4c-d811-4471-b656-c755c77e02ba"],
         "id": "89861c2a-10bf-4013-bdd4-3d020466aee4",
-        "name": "test_group_type"
+        "name": "test_group_type",
+        "is_default": false
     }
 }
diff --git a/api-ref/source/samples/share-group-types-default-list-response.json b/api-ref/source/samples/share-group-types-default-list-response.json
index a4b8464aaf..b7f1075ae3 100644
--- a/api-ref/source/samples/share-group-types-default-list-response.json
+++ b/api-ref/source/samples/share-group-types-default-list-response.json
@@ -4,6 +4,7 @@
         "group_specs": {},
         "share_types": ["ecd11f4c-d811-4471-b656-c755c77e02ba"],
         "id": "89861c2a-10bf-4013-bdd4-3d020466aee4",
-        "name": "test_group_type"
+        "name": "test_group_type",
+        "is_default": true
     }
 }
diff --git a/api-ref/source/samples/share-group-types-list-response.json b/api-ref/source/samples/share-group-types-list-response.json
index 7a6d489536..e624678d40 100644
--- a/api-ref/source/samples/share-group-types-list-response.json
+++ b/api-ref/source/samples/share-group-types-list-response.json
@@ -5,7 +5,8 @@
             "group_specs": {},
             "share_types": ["ecd11f4c-d811-4471-b656-c755c77e02ba"],
             "id": "89861c2a-10bf-4013-bdd4-3d020466aee4",
-            "name": "test_group_type"
+            "name": "test_group_type",
+            "is_default": false
         }
     ]
 }
diff --git a/api-ref/source/samples/share-type-create-response.json b/api-ref/source/samples/share-type-create-response.json
index a5add19450..6f3cbb18ac 100644
--- a/api-ref/source/samples/share-type-create-response.json
+++ b/api-ref/source/samples/share-type-create-response.json
@@ -14,6 +14,7 @@
         },
         "id": "7fa1342b-de9d-4d89-bdc8-af67795c0e52",
         "name": "testing",
+        "is_default": false,
         "description": "share type description"
     },
     "volume_type": {
@@ -31,6 +32,7 @@
         },
         "id": "7fa1342b-de9d-4d89-bdc8-af67795c0e52",
         "name": "testing",
+        "is_default": false,
         "description": "share type description"
     }
 }
diff --git a/api-ref/source/samples/share-type-show-response.json b/api-ref/source/samples/share-type-show-response.json
index 840bbda6c2..a5a746e566 100644
--- a/api-ref/source/samples/share-type-show-response.json
+++ b/api-ref/source/samples/share-type-show-response.json
@@ -9,6 +9,7 @@
         },
         "id": "2780fc88-526b-464a-a72c-ecb83f0e3929",
         "name": "default-share-type",
+        "is_default": true,
         "description": "manila share type"
     },
     "volume_type": {
@@ -21,6 +22,7 @@
         },
         "id": "2780fc88-526b-464a-a72c-ecb83f0e3929",
         "name": "default-share-type",
+        "is_default": true,
         "description": "manila share type"
     }
 }
diff --git a/api-ref/source/samples/share-types-default-list-response.json b/api-ref/source/samples/share-types-default-list-response.json
index 3d2773b871..677b5d8719 100644
--- a/api-ref/source/samples/share-types-default-list-response.json
+++ b/api-ref/source/samples/share-types-default-list-response.json
@@ -9,6 +9,7 @@
         },
         "id": "420e6a31-3f3d-4ed7-9d11-59450372182a",
         "name": "default",
+        "is_default": true,
         "description": "share type description"
     },
     "volume_type": {
@@ -21,6 +22,7 @@
         },
         "id": "420e6a31-3f3d-4ed7-9d11-59450372182a",
         "name": "default",
+        "is_default": true,
         "description": "share type description"
     }
 }
diff --git a/api-ref/source/samples/share-types-list-response.json b/api-ref/source/samples/share-types-list-response.json
index ac745a1417..c3ac14a2ee 100644
--- a/api-ref/source/samples/share-types-list-response.json
+++ b/api-ref/source/samples/share-types-list-response.json
@@ -10,6 +10,7 @@
             },
             "id": "420e6a31-3f3d-4ed7-9d11-59450372182a",
             "name": "default",
+            "is_default": true,
             "description": "share type description"
         },
         {
@@ -27,6 +28,7 @@
             },
             "id": "7fa1342b-de9d-4d89-bdc8-af67795c0e52",
             "name": "testing",
+            "is_default": false,
             "description": "share type description"
         }
     ],
@@ -41,6 +43,7 @@
             },
             "id": "420e6a31-3f3d-4ed7-9d11-59450372182a",
             "name": "default",
+            "is_default": true,
             "description": "share type description"
         },
         {
@@ -58,6 +61,7 @@
             },
             "id": "7fa1342b-de9d-4d89-bdc8-af67795c0e52",
             "name": "testing",
+            "is_default": false,
             "description": "share type description"
         }
     ]
diff --git a/api-ref/source/share-group-types.inc b/api-ref/source/share-group-types.inc
index 7baddb5130..7344b79920 100644
--- a/api-ref/source/share-group-types.inc
+++ b/api-ref/source/share-group-types.inc
@@ -65,6 +65,7 @@ Response parameters
    - share_types: share_types_1
    - name: share_group_type_name
    - group_specs: group_specs_required
+   - is_default: is_group_type_default
 
 Response example
 ----------------
@@ -103,7 +104,7 @@ Request
 
 Response parameters
 -------------------
- 
+
 .. rest_parameters:: parameters.yaml
 
    - id: share_group_type_id_required
@@ -111,6 +112,7 @@ Response parameters
    - share_types: share_types_1
    - name: share_group_type_name
    - group_specs: group_specs_required
+   - is_default: is_group_type_default
 
 Response example
 ----------------
@@ -211,6 +213,7 @@ Response parameters
    - name: share_group_type_name
    - share_types: share_types_1
    - is_public: share_group_type_is_public
+   - is_default: is_group_type_default
 
 Response example
 ----------------
diff --git a/api-ref/source/share-types.inc b/api-ref/source/share-types.inc
index 457a440b07..eef8acc725 100644
--- a/api-ref/source/share-types.inc
+++ b/api-ref/source/share-types.inc
@@ -124,6 +124,7 @@ Response parameters
    - share_type_access:is_public: share_type_access:is_public
    - create_share_from_snapshot_support: create_share_from_snapshot_support
    - description: share_type_description
+   - is_default: is_default_type
 
 Response example
 ----------------
@@ -173,6 +174,7 @@ Response parameters
    - share_type_access:is_public: share_type_access:is_public
    - name: share_type_name
    - description: share_type_description
+   - is_default: is_default_type
 
 Response example
 ----------------
@@ -227,6 +229,7 @@ Response Parameters
    - share_type_access:is_public: share_type_access:is_public
    - name: share_type_name
    - description: share_type_description
+   - is_default: is_default_type
 
 Response Example
 ----------------
@@ -348,6 +351,7 @@ Response parameters
    - revert_to_snapshot_support: revert_to_snapshot_support
    - create_share_from_snapshot_support: create_share_from_snapshot_support
    - description: share_type_description
+   - is_default: is_default_type
 
 Response example
 ----------------
diff --git a/manila/api/openstack/api_version_request.py b/manila/api/openstack/api_version_request.py
index 4a6fa8b720..656bc97b96 100644
--- a/manila/api/openstack/api_version_request.py
+++ b/manila/api/openstack/api_version_request.py
@@ -119,13 +119,15 @@ REST_API_VERSION_HISTORY = """
     * 2.45 - Added access metadata for share access and also introduced
              the GET /share-access-rules API. The prior API to retrieve
              access rules will not work with API version >=2.45.
+    * 2.46 - Added 'is_default' field to 'share_type' and 'share_group_type'
+             objects.
 """
 
 # The minimum and maximum versions of the API supported
 # The default api version request is defined to be the
 # minimum version of the API supported.
 _MIN_API_VERSION = "2.0"
-_MAX_API_VERSION = "2.45"
+_MAX_API_VERSION = "2.46"
 DEFAULT_API_VERSION = _MIN_API_VERSION
 
 
diff --git a/manila/api/openstack/rest_api_version_history.rst b/manila/api/openstack/rest_api_version_history.rst
index 0e014cb9bc..085c1c5f54 100644
--- a/manila/api/openstack/rest_api_version_history.rst
+++ b/manila/api/openstack/rest_api_version_history.rst
@@ -248,3 +248,8 @@ user documentation.
   Added access metadata for share access and also introduced the
   GET /share-access-rules API. The prior API to retrieve access
   rules will not work with API version >=2.45.
+
+2.46
+----
+  Added 'is_default' field to 'share_type' and 'share_group_type'
+  objects.
diff --git a/manila/api/views/share_group_types.py b/manila/api/views/share_group_types.py
index 02f23033ca..89e476f727 100644
--- a/manila/api/views/share_group_types.py
+++ b/manila/api/views/share_group_types.py
@@ -9,13 +9,20 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
+from oslo_config import cfg
 
 from manila.api import common
 
+CONF = cfg.CONF
+
 
 class ShareGroupTypeViewBuilder(common.ViewBuilder):
     _collection_name = 'share_group_types'
 
+    _detail_version_modifiers = [
+        "add_is_default_attr",
+    ]
+
     def show(self, request, share_group_type, brief=False):
         """Trim away extraneous share group type attributes."""
         group_specs = share_group_type.get('group_specs', {})
@@ -37,3 +44,15 @@ class ShareGroupTypeViewBuilder(common.ViewBuilder):
             for share_group_type in share_group_types
         ]
         return {"share_group_types": share_group_types_list}
+
+    @common.ViewBuilder.versioned_method("2.46")
+    def add_is_default_attr(self, context,
+                            share_group_type_dict,
+                            share_group_type):
+        is_default = False
+        type_name = share_group_type.get('name')
+        default_name = CONF.default_share_group_type
+
+        if default_name is not None:
+            is_default = default_name == type_name
+        share_group_type_dict['is_default'] = is_default
diff --git a/manila/api/views/types.py b/manila/api/views/types.py
index 2c81ca06ab..5dbef70dc0 100644
--- a/manila/api/views/types.py
+++ b/manila/api/views/types.py
@@ -13,10 +13,14 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from oslo_config import cfg
+
 from manila.api import common
 from manila.common import constants
 from manila.share import share_types
 
+CONF = cfg.CONF
+
 
 class ViewBuilder(common.ViewBuilder):
 
@@ -27,6 +31,7 @@ class ViewBuilder(common.ViewBuilder):
         "add_is_public_attr_extension_like",
         "add_inferred_optional_extra_specs",
         "add_description_attr",
+        "add_is_default_attr"
     ]
 
     def show(self, request, share_type, brief=False):
@@ -103,3 +108,13 @@ class ViewBuilder(common.ViewBuilder):
     @common.ViewBuilder.versioned_method("2.41")
     def add_description_attr(self, context, share_type_dict, share_type):
         share_type_dict['description'] = share_type.get('description')
+
+    @common.ViewBuilder.versioned_method("2.46")
+    def add_is_default_attr(self, context, share_type_dict, share_type):
+        is_default = False
+        type_name = share_type.get('name')
+        default_name = CONF.default_share_type
+
+        if default_name is not None:
+            is_default = default_name == type_name
+        share_type_dict['is_default'] = is_default
diff --git a/manila/tests/api/v2/test_share_group_types.py b/manila/tests/api/v2/test_share_group_types.py
index fb9ca83bca..e3705a37cd 100644
--- a/manila/tests/api/v2/test_share_group_types.py
+++ b/manila/tests/api/v2/test_share_group_types.py
@@ -15,6 +15,7 @@ import datetime
 
 import ddt
 import mock
+from oslo_config import cfg
 import webob
 
 from manila.api.v2 import share_group_types as types
@@ -24,6 +25,8 @@ from manila.share_group import share_group_types
 from manila import test
 from manila.tests.api import fakes
 
+CONF = cfg.CONF
+
 PROJ1_UUID = '11111111-1111-1111-1111-111111111111'
 PROJ2_UUID = '22222222-2222-2222-2222-222222222222'
 PROJ3_UUID = '33333333-3333-3333-3333-333333333333'
@@ -53,6 +56,18 @@ GROUP_TYPE_2 = {
     'share_types': [{'share_type_id': SHARE_TYPE_ID}],
 }
 
+GROUP_TYPE_3 = {
+    'id': '61fdcbed-db27-4cc0-8938-8b4f74c2ae59',
+    'name': u'group type 3',
+    'deleted': False,
+    'created_at': datetime.datetime(2012, 1, 1, 1, 1, 1, 1),
+    'updated_at': None,
+    'deleted_at': None,
+    'is_public': True,
+    'group_specs': {},
+    'share_types': [],
+}
+
 
 def fake_request(url, admin=False, experimental=True, version='2.31',
                  **kwargs):
@@ -430,6 +445,98 @@ class ShareGroupTypesAPITest(test.TestCase):
             webob.exc.HTTPNotFound,
             self.controller._create, req, fake_body)
 
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_share_group_types_create_with_is_default_key(self,
+                                                          version,
+                                                          admin):
+        # is_default is false
+        fake_type = copy.deepcopy(GROUP_TYPE_1)
+        fake_type['share_types'] = [{'share_type_id': SHARE_TYPE_ID}]
+        self.mock_object(share_group_types, 'create')
+        self.mock_object(
+            share_group_types, 'get_by_name',
+            mock.Mock(return_value=fake_type))
+        req = fake_request('/v2/fake/share-group-types',
+                           version=version,
+                           admin=admin)
+        fake_body = {'share_group_type': {
+            'name': GROUP_TYPE_1['name'],
+            'share_types': [SHARE_TYPE_ID],
+        }}
+        res_dict = self.controller._create(req, fake_body)
+        if self.is_microversion_ge(version, '2.46'):
+            self.assertIn('is_default', res_dict['share_group_type'])
+            self.assertIs(False, res_dict['share_group_type']['is_default'])
+        else:
+            self.assertNotIn('is_default', res_dict['share_group_type'])
+
+        # is_default is true
+        default_type_name = 'group type 3'
+        CONF.set_default('default_share_group_type', default_type_name)
+
+        fake_type = copy.deepcopy(GROUP_TYPE_3)
+        fake_type['share_types'] = [{'share_type_id': SHARE_TYPE_ID}]
+        self.mock_object(share_group_types, 'create')
+        self.mock_object(
+            share_group_types, 'get_by_name',
+            mock.Mock(return_value=fake_type))
+        req = fake_request('/v2/fake/share-group-types',
+                           version=version,
+                           admin=admin)
+        fake_body = {'share_group_type': {
+            'name': GROUP_TYPE_3['name'],
+            'share_types': [SHARE_TYPE_ID],
+        }}
+        res_dict = self.controller._create(req, fake_body)
+        if self.is_microversion_ge(version, '2.46'):
+            self.assertIn('is_default', res_dict['share_group_type'])
+            self.assertIs(True, res_dict['share_group_type']['is_default'])
+        else:
+            self.assertNotIn('is_default', res_dict['share_group_type'])
+
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_share_group_types_list_with_is_default_key(self, version, admin):
+        fake_types = {
+            GROUP_TYPE_1['name']: GROUP_TYPE_1,
+            GROUP_TYPE_2['name']: GROUP_TYPE_2,
+        }
+        self.mock_object(
+            share_group_types, 'get_all',
+            mock.Mock(return_value=fake_types))
+        req = fake_request(
+            '/v2/fake/share-group-types?is_public=all',
+            version=version,
+            admin=admin)
+        res_dict = self.controller.index(req)
+        for res in res_dict['share_group_types']:
+            if self.is_microversion_ge(version, '2.46'):
+                self.assertIn('is_default', res)
+                self.assertIs(False, res['is_default'])
+            else:
+                self.assertNotIn('is_default', res)
+        self.assertEqual(2, len(res_dict['share_group_types']))
+
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_shares_group_types_show_with_is_default_key(self, version, admin):
+        self.mock_object(
+            share_group_types, 'get',
+            mock.Mock(return_value=GROUP_TYPE_2))
+        req = fake_request('/v2/fake/group-types/%s' % GROUP_TYPE_2['id'],
+                           version=version,
+                           admin=admin)
+        res_dict = self.controller.show(req, GROUP_TYPE_2['id'])
+        if self.is_microversion_ge(version, '2.46'):
+            self.assertIn('is_default', res_dict['share_group_type'])
+            self.assertIs(False, res_dict['share_group_type']['is_default'])
+        else:
+            self.assertNotIn('is_default', res_dict['share_group_type'])
+
 
 class ShareGroupTypeAccessTest(test.TestCase):
 
diff --git a/manila/tests/api/v2/test_share_types.py b/manila/tests/api/v2/test_share_types.py
index b29146aced..6b7c3936c2 100644
--- a/manila/tests/api/v2/test_share_types.py
+++ b/manila/tests/api/v2/test_share_types.py
@@ -17,6 +17,7 @@ import datetime
 
 import ddt
 import mock
+from oslo_config import cfg
 from oslo_utils import timeutils
 import webob
 
@@ -32,6 +33,8 @@ from manila import test
 from manila.tests.api import fakes
 from manila.tests import fake_notifier
 
+CONF = cfg.CONF
+
 
 def stub_share_type(id):
     specs = {
@@ -61,6 +64,34 @@ def return_share_types_get_all_types(context, search_opts=None):
     )
 
 
+def stub_default_name():
+    return 'default_share_type'
+
+
+def stub_default_share_type(id):
+    return dict(
+        id=id,
+        name=stub_default_name(),
+        description='description_%s' % str(id),
+        required_extra_specs={
+            constants.ExtraSpecs.DRIVER_HANDLES_SHARE_SERVERS: "true",
+        }
+    )
+
+
+def return_all_share_types(context, search_opts=None):
+    mock_value = dict(
+        share_type_1=stub_share_type(1),
+        share_type_2=stub_share_type(2),
+        share_type_3=stub_default_share_type(3)
+    )
+    return mock_value
+
+
+def return_default_share_type(context, search_opts=None):
+    return stub_default_share_type(3)
+
+
 def return_empty_share_types_get_all_types(context, search_opts=None):
     return {}
 
@@ -491,6 +522,65 @@ class ShareTypesAPITest(test.TestCase):
         for d1, d2 in zip(expected, observed):
             self.assertEqual(d1['id'], d2['id'])
 
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_share_types_create_with_is_default_key(self, version, admin):
+        req = fakes.HTTPRequest.blank('/v2/fake/types',
+                                      version=version,
+                                      use_admin_context=admin)
+
+        body = make_create_body()
+        res_dict = self.controller.create(req, body)
+        if self.is_microversion_ge(version, '2.46'):
+            self.assertIn('is_default', res_dict['share_type'])
+            self.assertIs(False, res_dict['share_type']['is_default'])
+        else:
+            self.assertNotIn('is_default', res_dict['share_type'])
+
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_share_types_index_with_is_default_key(self, version, admin):
+        default_type_name = stub_default_name()
+        CONF.set_default("default_share_type", default_type_name)
+        self.mock_object(share_types, 'get_all_types',
+                         return_all_share_types)
+
+        req = fakes.HTTPRequest.blank('/v2/fake/types',
+                                      version=version,
+                                      use_admin_context=admin)
+
+        res_dict = self.controller.index(req)
+        self.assertEqual(3, len(res_dict['share_types']))
+        for res in res_dict['share_types']:
+            if self.is_microversion_ge(version, '2.46'):
+                self.assertIn('is_default', res)
+                expected = res['name'] == default_type_name
+                self.assertIs(res['is_default'], expected)
+            else:
+                self.assertNotIn('is_default', res)
+
+    @ddt.data(('2.45', True), ('2.45', False),
+              ('2.46', True), ('2.46', False))
+    @ddt.unpack
+    def test_share_types_default_with_is_default_key(self, version, admin):
+        default_type_name = stub_default_name()
+        CONF.set_default("default_share_type", default_type_name)
+        self.mock_object(share_types, 'get_default_share_type',
+                         return_default_share_type)
+
+        req = fakes.HTTPRequest.blank('/v2/fake/types/default_share_type',
+                                      version=version,
+                                      use_admin_context=admin)
+
+        res_dict = self.controller.default(req)
+        if self.is_microversion_ge(version, '2.46'):
+            self.assertIn('is_default', res_dict['share_type'])
+            self.assertIs(True, res_dict['share_type']['is_default'])
+        else:
+            self.assertNotIn('is_default', res_dict['share_type'])
+
 
 def generate_type(type_id, is_public):
     return {
diff --git a/releasenotes/notes/add-is-default-e49727d276dd9bc3.yaml b/releasenotes/notes/add-is-default-e49727d276dd9bc3.yaml
new file mode 100644
index 0000000000..9ecd0f18a9
--- /dev/null
+++ b/releasenotes/notes/add-is-default-e49727d276dd9bc3.yaml
@@ -0,0 +1,6 @@
+---
+features:
+
+  - The share type and share group type APIs in API version 2.46 return
+    field "is_default" which is set to 'true' if the share type or the
+    share group type is the default as configured by the administrator.