diff --git a/docs/release-notes/version-2.7.md b/docs/release-notes/version-2.7.md
index 770fc4b8d..4f0fc2670 100644
--- a/docs/release-notes/version-2.7.md
+++ b/docs/release-notes/version-2.7.md
@@ -21,6 +21,7 @@
 * [#4241](https://github.com/netbox-community/netbox/issues/4241) - Correct IP address hyperlinks on interface view
 * [#4246](https://github.com/netbox-community/netbox/issues/4246) - Fix duplication of field attributes when multiple IPNetworkVars are present in a script
 * [#4252](https://github.com/netbox-community/netbox/issues/4252) - Fix power port assignment for power outlet templates created via REST API
+* [#4272](https://github.com/netbox-community/netbox/issues/4272) - Interface type should be required by API serializer
 
 ---
 
diff --git a/netbox/dcim/api/serializers.py b/netbox/dcim/api/serializers.py
index 7b3218b17..5483904f5 100644
--- a/netbox/dcim/api/serializers.py
+++ b/netbox/dcim/api/serializers.py
@@ -298,7 +298,7 @@ class PowerOutletTemplateSerializer(ValidatedModelSerializer):
 
 class InterfaceTemplateSerializer(ValidatedModelSerializer):
     device_type = NestedDeviceTypeSerializer()
-    type = ChoiceField(choices=InterfaceTypeChoices, required=False)
+    type = ChoiceField(choices=InterfaceTypeChoices)
 
     class Meta:
         model = InterfaceTemplate
@@ -518,7 +518,7 @@ class PowerPortSerializer(TaggitSerializer, ConnectedEndpointSerializer):
 
 class InterfaceSerializer(TaggitSerializer, ConnectedEndpointSerializer):
     device = NestedDeviceSerializer()
-    type = ChoiceField(choices=InterfaceTypeChoices, required=False)
+    type = ChoiceField(choices=InterfaceTypeChoices)
     lag = NestedInterfaceSerializer(required=False, allow_null=True)
     mode = ChoiceField(choices=InterfaceModeChoices, allow_blank=True, required=False)
     untagged_vlan = NestedVLANSerializer(required=False, allow_null=True)
diff --git a/netbox/dcim/tests/test_api.py b/netbox/dcim/tests/test_api.py
index ff86d6ccc..ad893bec6 100644
--- a/netbox/dcim/tests/test_api.py
+++ b/netbox/dcim/tests/test_api.py
@@ -1470,13 +1470,13 @@ class InterfaceTemplateTest(APITestCase):
             manufacturer=self.manufacturer, model='Test Device Type 1', slug='test-device-type-1'
         )
         self.interfacetemplate1 = InterfaceTemplate.objects.create(
-            device_type=self.devicetype, name='Test Interface Template 1'
+            device_type=self.devicetype, name='Test Interface Template 1', type='1000base-t'
         )
         self.interfacetemplate2 = InterfaceTemplate.objects.create(
-            device_type=self.devicetype, name='Test Interface Template 2'
+            device_type=self.devicetype, name='Test Interface Template 2', type='1000base-t'
         )
         self.interfacetemplate3 = InterfaceTemplate.objects.create(
-            device_type=self.devicetype, name='Test Interface Template 3'
+            device_type=self.devicetype, name='Test Interface Template 3', type='1000base-t'
         )
 
     def test_get_interfacetemplate(self):
@@ -1498,6 +1498,7 @@ class InterfaceTemplateTest(APITestCase):
         data = {
             'device_type': self.devicetype.pk,
             'name': 'Test Interface Template 4',
+            'type': '1000base-t',
         }
 
         url = reverse('dcim-api:interfacetemplate-list')
@@ -1515,14 +1516,17 @@ class InterfaceTemplateTest(APITestCase):
             {
                 'device_type': self.devicetype.pk,
                 'name': 'Test Interface Template 4',
+                'type': '1000base-t',
             },
             {
                 'device_type': self.devicetype.pk,
                 'name': 'Test Interface Template 5',
+                'type': '1000base-t',
             },
             {
                 'device_type': self.devicetype.pk,
                 'name': 'Test Interface Template 6',
+                'type': '1000base-t',
             },
         ]
 
@@ -1540,6 +1544,7 @@ class InterfaceTemplateTest(APITestCase):
         data = {
             'device_type': self.devicetype.pk,
             'name': 'Test Interface Template X',
+            'type': '1000base-x-gbic',
         }
 
         url = reverse('dcim-api:interfacetemplate-detail', kwargs={'pk': self.interfacetemplate1.pk})
@@ -2650,9 +2655,9 @@ class InterfaceTest(APITestCase):
         self.device = Device.objects.create(
             device_type=devicetype, device_role=devicerole, name='Test Device 1', site=site
         )
-        self.interface1 = Interface.objects.create(device=self.device, name='Test Interface 1')
-        self.interface2 = Interface.objects.create(device=self.device, name='Test Interface 2')
-        self.interface3 = Interface.objects.create(device=self.device, name='Test Interface 3')
+        self.interface1 = Interface.objects.create(device=self.device, name='Test Interface 1', type='1000base-t')
+        self.interface2 = Interface.objects.create(device=self.device, name='Test Interface 2', type='1000base-t')
+        self.interface3 = Interface.objects.create(device=self.device, name='Test Interface 3', type='1000base-t')
 
         self.vlan1 = VLAN.objects.create(name="Test VLAN 1", vid=1)
         self.vlan2 = VLAN.objects.create(name="Test VLAN 2", vid=2)
@@ -2713,6 +2718,7 @@ class InterfaceTest(APITestCase):
         data = {
             'device': self.device.pk,
             'name': 'Test Interface 4',
+            'type': '1000base-t',
         }
 
         url = reverse('dcim-api:interface-list')
@@ -2729,6 +2735,7 @@ class InterfaceTest(APITestCase):
         data = {
             'device': self.device.pk,
             'name': 'Test Interface 4',
+            'type': '1000base-t',
             'mode': InterfaceModeChoices.MODE_TAGGED,
             'untagged_vlan': self.vlan3.id,
             'tagged_vlans': [self.vlan1.id, self.vlan2.id],
@@ -2750,14 +2757,17 @@ class InterfaceTest(APITestCase):
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 4',
+                'type': '1000base-t',
             },
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 5',
+                'type': '1000base-t',
             },
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 6',
+                'type': '1000base-t',
             },
         ]
 
@@ -2776,6 +2786,7 @@ class InterfaceTest(APITestCase):
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 4',
+                'type': '1000base-t',
                 'mode': InterfaceModeChoices.MODE_TAGGED,
                 'untagged_vlan': self.vlan2.id,
                 'tagged_vlans': [self.vlan1.id],
@@ -2783,6 +2794,7 @@ class InterfaceTest(APITestCase):
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 5',
+                'type': '1000base-t',
                 'mode': InterfaceModeChoices.MODE_TAGGED,
                 'untagged_vlan': self.vlan2.id,
                 'tagged_vlans': [self.vlan1.id],
@@ -2790,6 +2802,7 @@ class InterfaceTest(APITestCase):
             {
                 'device': self.device.pk,
                 'name': 'Test Interface 6',
+                'type': '1000base-t',
                 'mode': InterfaceModeChoices.MODE_TAGGED,
                 'untagged_vlan': self.vlan2.id,
                 'tagged_vlans': [self.vlan1.id],
@@ -2815,6 +2828,7 @@ class InterfaceTest(APITestCase):
         data = {
             'device': self.device.pk,
             'name': 'Test Interface X',
+            'type': '1000base-x-gbic',
             'lag': lag_interface.pk,
         }