diff --git a/.changeset/wicked-pumas-nail.md b/.changeset/wicked-pumas-nail.md
new file mode 100644
index 0000000000..c9e05aff74
--- /dev/null
+++ b/.changeset/wicked-pumas-nail.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend': patch
+---
+
+Inject optional `CatalogApi` into auth-backend `createRouter` function. This will enable developers to use customized `CatalogApi` when creating the router.