diff --git a/grapple/actions.py b/grapple/actions.py
index 96957ff1..899d8852 100644
--- a/grapple/actions.py
+++ b/grapple/actions.py
@@ -9,6 +9,7 @@
 from django.apps import apps
 from django.core.exceptions import FieldDoesNotExist
 from django.db import models
+from django.utils.module_loading import import_string
 from graphene_django.types import DjangoObjectType
 from wagtail.blocks import StructValue, stream_block
 from wagtail.contrib.settings.models import BaseGenericSetting, BaseSiteSetting
@@ -268,7 +269,13 @@ class StubMeta:
         model = stub_model
 
     # Gather any interfaces, and discard None values
-    interfaces = {interface, *getattr(cls, "graphql_interfaces", ())}
+    interface_classes = list(getattr(cls, "graphql_interfaces", ()))
+    for i, interface_class in enumerate(interface_classes):
+        if isinstance(interface_class, str):
+            interface_classes[i] = import_string(interface_class)
+    interface_classes = tuple(interface_classes)
+
+    interfaces = {interface, *interface_classes}
     interfaces.discard(None)
 
     type_meta = {
diff --git a/tests/test_interfaces.py b/tests/test_interfaces.py
index a1276010..58a83f55 100644
--- a/tests/test_interfaces.py
+++ b/tests/test_interfaces.py
@@ -89,21 +89,29 @@ def test_schema_for_page_with_graphql_interface(self):
         results = self.introspect_schema_by_type("AuthorPage")
         self.assertListEqual(
             sorted(results["data"]["__type"]["interfaces"], key=lambda x: x["name"]),
-            [{"name": "AdditionalInterface"}, {"name": "PageInterface"}],
+            [
+                {"name": "AdditionalInterface"},
+                {"name": "AlternativeInterface"},
+                {"name": "PageInterface"},
+            ],
         )
 
     def test_schema_for_snippet_with_graphql_interface(self):
         results = self.introspect_schema_by_type("Advert")
         self.assertListEqual(
             sorted(results["data"]["__type"]["interfaces"], key=lambda x: x["name"]),
-            [{"name": "AdditionalInterface"}, {"name": "SnippetInterface"}],
+            [
+                {"name": "AdditionalInterface"},
+                {"name": "AlternativeInterface"},
+                {"name": "SnippetInterface"},
+            ],
         )
 
     def test_schema_for_django_model_with_graphql_interfaces(self):
         results = self.introspect_schema_by_type("SimpleModel")
         self.assertListEqual(
             sorted(results["data"]["__type"]["interfaces"], key=lambda x: x["name"]),
-            [{"name": "AdditionalInterface"}],
+            [{"name": "AdditionalInterface"}, {"name": "AlternativeInterface"}],
         )
 
 
diff --git a/tests/testapp/interfaces.py b/tests/testapp/interfaces.py
index 41baec05..dc11c314 100644
--- a/tests/testapp/interfaces.py
+++ b/tests/testapp/interfaces.py
@@ -7,6 +7,10 @@ class AdditionalInterface(graphene.Interface):
     additional_text = graphene.String()
 
 
+class AlternativeInterface(graphene.Interface):
+    alternative_text = graphene.String()
+
+
 class CustomPageInterface(PageInterface):
     custom_text = graphene.String()
 
diff --git a/tests/testapp/models/core.py b/tests/testapp/models/core.py
index 732b1554..37a1dcaf 100644
--- a/tests/testapp/models/core.py
+++ b/tests/testapp/models/core.py
@@ -50,7 +50,10 @@
 
 @register_singular_query_field("simpleModel")
 class SimpleModel(models.Model):
-    graphql_interfaces = (AdditionalInterface,)
+    graphql_interfaces = (
+        AdditionalInterface,
+        "testapp.interfaces.AlternativeInterface",
+    )
 
 
 def custom_middleware_one(next, root, info, **args):
@@ -83,7 +86,10 @@ class AuthorPage(Page):
     content_panels = Page.content_panels + [FieldPanel("name")]
 
     graphql_fields = [GraphQLString("name")]
-    graphql_interfaces = (AdditionalInterface,)
+    graphql_interfaces = (
+        AdditionalInterface,
+        "testapp.interfaces.AlternativeInterface",
+    )
 
 
 class BlogPageTag(TaggedItemBase):
@@ -264,7 +270,10 @@ class Advert(models.Model):
         GraphQLString("string_rich_text", source="rich_text"),
         GraphQLString("extra_rich_text", deprecation_reason="Use rich_text instead"),
     ]
-    graphql_interfaces = (AdditionalInterface,)
+    graphql_interfaces = (
+        AdditionalInterface,
+        "testapp.interfaces.AlternativeInterface",
+    )
 
     def __str__(self):
         return self.text