diff --git a/releasenotes/notes/add-show-default-quotas-api-to-network-quotas-client-3a7c1159af9e56ff.yaml b/releasenotes/notes/add-show-default-quotas-api-to-network-quotas-client-3a7c1159af9e56ff.yaml
new file mode 100644
index 0000000..6efe7e6
--- /dev/null
+++ b/releasenotes/notes/add-show-default-quotas-api-to-network-quotas-client-3a7c1159af9e56ff.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add show default quotas API to network quotas_client library.
+    This feature enables the possibility to show default network quotas for
+    a specified project.
diff --git a/tempest/api/network/admin/test_quotas.py b/tempest/api/network/admin/test_quotas.py
index cf4236d..57a28bf 100644
--- a/tempest/api/network/admin/test_quotas.py
+++ b/tempest/api/network/admin/test_quotas.py
@@ -80,6 +80,10 @@
         non_default_quotas = self.admin_quotas_client.list_quotas()
         for q in non_default_quotas['quotas']:
             self.assertNotEqual(project_id, q['tenant_id'])
+        quota_set = self.admin_quotas_client.show_quotas(project_id)['quota']
+        default_quotas = self.admin_quotas_client.show_default_quotas(
+            project_id)['quota']
+        self.assertEqual(default_quotas, quota_set)
 
     @decorators.idempotent_id('2390f766-836d-40ef-9aeb-e810d78207fb')
     def test_quotas(self):
diff --git a/tempest/lib/services/network/quotas_client.py b/tempest/lib/services/network/quotas_client.py
index fdd3d6b..f23af88 100644
--- a/tempest/lib/services/network/quotas_client.py
+++ b/tempest/lib/services/network/quotas_client.py
@@ -41,3 +41,8 @@
     def list_quotas(self, **filters):
         uri = '/quotas'
         return self.list_resources(uri, **filters)
+
+    def show_default_quotas(self, tenant_id):
+        """List default quotas for a project."""
+        uri = '/quotas/%s/default' % tenant_id
+        return self.show_resource(uri)
diff --git a/tempest/tests/lib/services/network/test_quotas_client.py b/tempest/tests/lib/services/network/test_quotas_client.py
index e76bc9c..5a09911 100644
--- a/tempest/tests/lib/services/network/test_quotas_client.py
+++ b/tempest/tests/lib/services/network/test_quotas_client.py
@@ -38,6 +38,20 @@
         ]
     }
 
+    FAKE_PROJECT_QUOTAS = {
+        "quota": {
+            "floatingip": 50,
+            "network": 10,
+            "port": 50,
+            "rbac_policy": -1,
+            "router": 10,
+            "security_group": 10,
+            "security_group_rule": 100,
+            "subnet": 10,
+            "subnetpool": -1
+        }
+    }
+
     FAKE_QUOTA_TENANT_ID = "bab7d5c60cd041a0a36f7c4b6e1dd978"
 
     def setUp(self):
@@ -58,7 +72,16 @@
         self.check_service_client_function(
             self.quotas_client.show_quotas,
             "tempest.lib.common.rest_client.RestClient.get",
-            {"quota": self.FAKE_QUOTAS["quotas"][0]},
+            self.FAKE_PROJECT_QUOTAS,
+            bytes_body,
+            200,
+            tenant_id=self.FAKE_QUOTA_TENANT_ID)
+
+    def _test_show_default_quotas(self, bytes_body=False):
+        self.check_service_client_function(
+            self.quotas_client.show_default_quotas,
+            "tempest.lib.common.rest_client.RestClient.get",
+            self.FAKE_PROJECT_QUOTAS,
             bytes_body,
             200,
             tenant_id=self.FAKE_QUOTA_TENANT_ID)
@@ -67,7 +90,7 @@
         self.check_service_client_function(
             self.quotas_client.update_quotas,
             "tempest.lib.common.rest_client.RestClient.put",
-            {"quota": self.FAKE_QUOTAS["quotas"][0]},
+            self.FAKE_PROJECT_QUOTAS,
             bytes_body,
             200,
             tenant_id=self.FAKE_QUOTA_TENANT_ID)
@@ -92,6 +115,12 @@
     def test_show_quotas_with_bytes_body(self):
         self._test_show_quotas(bytes_body=True)
 
+    def test_show_default_quotas_with_str_body(self):
+        self._test_show_default_quotas()
+
+    def test_show_default_quotas_with_bytes_body(self):
+        self._test_show_default_quotas(bytes_body=True)
+
     def test_update_quotas_with_str_body(self):
         self._test_update_quotas()