diff --git a/packages/catalog-model/examples/all-domains.yaml b/packages/catalog-model/examples/all-domains.yaml
index 91a8a5b76d..5855fde34b 100644
--- a/packages/catalog-model/examples/all-domains.yaml
+++ b/packages/catalog-model/examples/all-domains.yaml
@@ -5,5 +5,6 @@ metadata:
   description: A collection of all Backstage example domains
 spec:
   targets:
+    - ./domains/audio-domain.yaml
     - ./domains/artists-domain.yaml
     - ./domains/playback-domain.yaml
diff --git a/packages/catalog-model/examples/domains/artists-domain.yaml b/packages/catalog-model/examples/domains/artists-domain.yaml
index 2a74425791..44963e8a34 100644
--- a/packages/catalog-model/examples/domains/artists-domain.yaml
+++ b/packages/catalog-model/examples/domains/artists-domain.yaml
@@ -11,3 +11,4 @@ metadata:
       icon: dashboard
 spec:
   owner: team-a
+  domain: audio
diff --git a/packages/catalog-model/examples/domains/audio-domain.yaml b/packages/catalog-model/examples/domains/audio-domain.yaml
new file mode 100644
index 0000000000..c454a7cf8d
--- /dev/null
+++ b/packages/catalog-model/examples/domains/audio-domain.yaml
@@ -0,0 +1,13 @@
+apiVersion: backstage.io/v1alpha1
+kind: Domain
+metadata:
+  name: audio
+  description: Everything related to audio
+  links:
+    - url: http://example.com/domain/audio/
+      title: Domain Readme
+    - url: http://example.com/domains/audio/dashboard
+      title: Domain Metrics Dashboard
+      icon: dashboard
+spec:
+  owner: acme-corp
diff --git a/packages/catalog-model/src/kinds/DomainEntityV1alpha1.test.ts b/packages/catalog-model/src/kinds/DomainEntityV1alpha1.test.ts
index 822a7984e9..40c3e3ee5e 100644
--- a/packages/catalog-model/src/kinds/DomainEntityV1alpha1.test.ts
+++ b/packages/catalog-model/src/kinds/DomainEntityV1alpha1.test.ts
@@ -31,6 +31,7 @@ describe('DomainV1alpha1Validator', () => {
       },
       spec: {
         owner: 'me',
+        domain: 'parent',
       },
     };
   });
@@ -68,4 +69,19 @@ describe('DomainV1alpha1Validator', () => {
     (entity as any).spec.owner = '';
     await expect(validator.check(entity)).rejects.toThrow(/owner/);
   });
+
+  it('accepts missing domain', async () => {
+    delete (entity as any).spec.domain;
+    await expect(validator.check(entity)).resolves.toBe(true);
+  });
+
+  it('rejects wrong domain', async () => {
+    (entity as any).spec.domain = 7;
+    await expect(validator.check(entity)).rejects.toThrow(/domain/);
+  });
+
+  it('rejects empty domain', async () => {
+    (entity as any).spec.domain = '';
+    await expect(validator.check(entity)).rejects.toThrow(/domain/);
+  });
 });
diff --git a/packages/catalog-model/src/kinds/DomainEntityV1alpha1.ts b/packages/catalog-model/src/kinds/DomainEntityV1alpha1.ts
index e0302fcc52..dacb5f817b 100644
--- a/packages/catalog-model/src/kinds/DomainEntityV1alpha1.ts
+++ b/packages/catalog-model/src/kinds/DomainEntityV1alpha1.ts
@@ -32,6 +32,7 @@ export interface DomainEntityV1alpha1 extends Entity {
   kind: 'Domain';
   spec: {
     owner: string;
+    domain?: string;
   };
 }
 
diff --git a/packages/catalog-model/src/schema/kinds/Domain.v1alpha1.schema.json b/packages/catalog-model/src/schema/kinds/Domain.v1alpha1.schema.json
index a1a09b1213..00549db11b 100644
--- a/packages/catalog-model/src/schema/kinds/Domain.v1alpha1.schema.json
+++ b/packages/catalog-model/src/schema/kinds/Domain.v1alpha1.schema.json
@@ -11,7 +11,8 @@
         "description": "Everything about artists"
       },
       "spec": {
-        "owner": "artist-relations-team"
+        "owner": "artist-relations-team",
+        "domain": "artists"
       }
     }
   ],
@@ -38,6 +39,12 @@
               "description": "An entity reference to the owner of the component.",
               "examples": ["artist-relations-team", "user:john.johnson"],
               "minLength": 1
+            },
+            "domain": {
+              "type": "string",
+              "description": "An entity reference to the domain that the system belongs to.",
+              "examples": ["artists"],
+              "minLength": 1
             }
           }
         }