diff --git a/.changeset/polite-planets-learn.md b/.changeset/polite-planets-learn.md
new file mode 100644
index 0000000000..283af6e801
--- /dev/null
+++ b/.changeset/polite-planets-learn.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-org': patch
+---
+
+Fix linking ownership card to catalog owner filter when namespaces are used
diff --git a/plugins/org/src/components/Cards/OwnershipCard/OwnershipCard.test.tsx b/plugins/org/src/components/Cards/OwnershipCard/OwnershipCard.test.tsx
index b6e3982d51..16a8898f0a 100644
--- a/plugins/org/src/components/Cards/OwnershipCard/OwnershipCard.test.tsx
+++ b/plugins/org/src/components/Cards/OwnershipCard/OwnershipCard.test.tsx
@@ -265,6 +265,10 @@ describe('OwnershipCard', () => {
           type: 'memberOf',
           targetRef: 'group:default/my-team',
         },
+        {
+          type: 'memberOf',
+          targetRef: 'group:custom/some-team',
+        },
       ],
     };
     const catalogApi: jest.Mocked<CatalogApi> = {
@@ -288,7 +292,7 @@ describe('OwnershipCard', () => {
 
     expect(getByText('OPENAPI').closest('a')).toHaveAttribute(
       'href',
-      '/create/?filters%5Bkind%5D=API&filters%5Btype%5D=openapi&filters%5Bowners%5D=the-user&filters%5Bowners%5D=my-team&filters%5Buser%5D=all',
+      '/create/?filters%5Bkind%5D=API&filters%5Btype%5D=openapi&filters%5Bowners%5D=user%3Athe-user&filters%5Bowners%5D=my-team&filters%5Bowners%5D=custom%2Fsome-team&filters%5Buser%5D=all',
     );
   });
 
diff --git a/plugins/org/src/components/Cards/OwnershipCard/useGetEntities.ts b/plugins/org/src/components/Cards/OwnershipCard/useGetEntities.ts
index 6a4aaa1399..7c0bb76e2e 100644
--- a/plugins/org/src/components/Cards/OwnershipCard/useGetEntities.ts
+++ b/plugins/org/src/components/Cards/OwnershipCard/useGetEntities.ts
@@ -18,12 +18,14 @@ import {
   Entity,
   RELATION_MEMBER_OF,
   RELATION_PARENT_OF,
+  parseEntityRef,
   stringifyEntityRef,
 } from '@backstage/catalog-model';
 import {
   CatalogApi,
   catalogApiRef,
   getEntityRelations,
+  humanizeEntityRef,
 } from '@backstage/plugin-catalog-react';
 import limiterFactory from 'p-limit';
 import { useApi } from '@backstage/core-plugin-api';
@@ -43,7 +45,9 @@ const getQueryParams = (
   selectedEntity: EntityTypeProps,
 ): string => {
   const { kind, type } = selectedEntity;
-  const owners = ownersEntityRef.map(owner => owner.split('/')[1]);
+  const owners = ownersEntityRef.map(owner =>
+    humanizeEntityRef(parseEntityRef(owner), { defaultKind: 'group' }),
+  );
   const filters = {
     kind,
     type,