diff --git a/.changeset/poor-peaches-happen.md b/.changeset/poor-peaches-happen.md
new file mode 100644
index 0000000000..db5dac5093
--- /dev/null
+++ b/.changeset/poor-peaches-happen.md
@@ -0,0 +1,7 @@
+---
+'@backstage/core-plugin-api': minor
+---
+
+Removed the deprecated `id` field of `BackstageIdentityResponse`.
+
+Existing usage can be replaced by parsing the `name` of the `identity.userEntityRef` with `parseEntityRef` from `@backstage/catalog-model`, although note that it is recommended to consume the entire `userEntityRef` in order to support namespaces.
diff --git a/packages/core-plugin-api/api-report.md b/packages/core-plugin-api/api-report.md
index e55004ba35..5ac07e195c 100644
--- a/packages/core-plugin-api/api-report.md
+++ b/packages/core-plugin-api/api-report.md
@@ -216,7 +216,6 @@ export type BackstageIdentityApi = {
 
 // @public
 export type BackstageIdentityResponse = {
-  id: string;
   token: string;
   identity: BackstageUserIdentity;
 };
diff --git a/packages/core-plugin-api/src/apis/definitions/auth.ts b/packages/core-plugin-api/src/apis/definitions/auth.ts
index e5a41d8973..ed5a7a3264 100644
--- a/packages/core-plugin-api/src/apis/definitions/auth.ts
+++ b/packages/core-plugin-api/src/apis/definitions/auth.ts
@@ -221,13 +221,6 @@ export type BackstageUserIdentity = {
  * @public
  */
 export type BackstageIdentityResponse = {
-  /**
-   * The backstage user ID.
-   *
-   * @deprecated The identity is now provided via the `identity` field instead.
-   */
-  id: string;
-
   /**
    * The token used to authenticate the user within Backstage.
    */