diff --git a/.changeset/purple-cows-sing.md b/.changeset/purple-cows-sing.md
new file mode 100644
index 0000000000..3391ced648
--- /dev/null
+++ b/.changeset/purple-cows-sing.md
@@ -0,0 +1,5 @@
+---
+'@backstage/backend-plugin-api': minor
+---
+
+Removed deprecated `ServiceFactoryOrFunction` type.
diff --git a/packages/backend-plugin-api/api-report.md b/packages/backend-plugin-api/api-report.md
index 4b1ffc81e7..c8f788e1f0 100644
--- a/packages/backend-plugin-api/api-report.md
+++ b/packages/backend-plugin-api/api-report.md
@@ -623,9 +623,6 @@ export interface ServiceFactory<
   service: ServiceRef<TService, TScope, TInstances>;
 }
 
-// @public @deprecated
-export type ServiceFactoryOrFunction = ServiceFactory | (() => ServiceFactory);
-
 // @public
 export type ServiceRef<
   TService,
diff --git a/packages/backend-plugin-api/src/services/system/index.ts b/packages/backend-plugin-api/src/services/system/index.ts
index 9f62968ecd..82afa904fe 100644
--- a/packages/backend-plugin-api/src/services/system/index.ts
+++ b/packages/backend-plugin-api/src/services/system/index.ts
@@ -20,6 +20,5 @@ export type {
   ServiceFactory,
   PluginServiceFactoryOptions,
   RootServiceFactoryOptions,
-  ServiceFactoryOrFunction,
 } from './types';
 export { createServiceRef, createServiceFactory } from './types';
diff --git a/packages/backend-plugin-api/src/services/system/types.ts b/packages/backend-plugin-api/src/services/system/types.ts
index ce742bb39c..9e054ed4a4 100644
--- a/packages/backend-plugin-api/src/services/system/types.ts
+++ b/packages/backend-plugin-api/src/services/system/types.ts
@@ -76,14 +76,6 @@ export interface InternalServiceFactory<
   ): Promise<TService>;
 }
 
-/**
- * Represents either a {@link ServiceFactory} or a function that returns one.
- *
- * @deprecated The support for service factory functions is deprecated and will be removed.
- * @public
- */
-export type ServiceFactoryOrFunction = ServiceFactory | (() => ServiceFactory);
-
 /** @public */
 export interface ServiceRefOptions<
   TService,