diff --git a/.api-reports/api-report-testing_experimental.api.md b/.api-reports/api-report-testing_experimental.api.md
index 97af4a043cf..330f543fc64 100644
--- a/.api-reports/api-report-testing_experimental.api.md
+++ b/.api-reports/api-report-testing_experimental.api.md
@@ -8,7 +8,7 @@ import type { FieldNode } from 'graphql';
 import type { FragmentDefinitionNode } from 'graphql';
 import type { GraphQLSchema } from 'graphql';
 
-// @alpha
+// @alpha @deprecated
 export const createSchemaFetch: (schema: GraphQLSchema, mockFetchOpts?: {
     validate?: boolean;
     delay?: {
@@ -24,7 +24,7 @@ export const createSchemaFetch: (schema: GraphQLSchema, mockFetchOpts?: {
 // Warning: (ae-forgotten-export) The symbol "TestSchemaOptions" needs to be exported by the entry point index.d.ts
 // Warning: (ae-forgotten-export) The symbol "ProxiedSchema" needs to be exported by the entry point index.d.ts
 //
-// @alpha
+// @alpha @deprecated
 export const createTestSchema: (schemaWithTypeDefs: GraphQLSchema, options: TestSchemaOptions) => ProxiedSchema;
 
 // @public
diff --git a/.changeset/weak-ads-develop.md b/.changeset/weak-ads-develop.md
new file mode 100644
index 00000000000..2499c7cb871
--- /dev/null
+++ b/.changeset/weak-ads-develop.md
@@ -0,0 +1,5 @@
+---
+"@apollo/client": minor
+---
+
+Deprecates experimental schema testing utilities introduced in 3.10 in favor of recommending [`@apollo/graphql-testing-library`](https://github.com/apollographql/graphql-testing-library).
diff --git a/src/testing/experimental/createSchemaFetch.ts b/src/testing/experimental/createSchemaFetch.ts
index fe253f98899..9f018156cf1 100644
--- a/src/testing/experimental/createSchemaFetch.ts
+++ b/src/testing/experimental/createSchemaFetch.ts
@@ -30,6 +30,8 @@ import { wait } from "../core/wait.js";
  * ```
  * @since 3.10.0
  * @alpha
+ * @deprecated `createSchemaFetch` is deprecated and will be removed in 3.12.0.
+ * Please migrate to [`@apollo/graphql-testing-library`](https://github.com/apollographql/graphql-testing-library).
  */
 const createSchemaFetch = (
   schema: GraphQLSchema,
diff --git a/src/testing/experimental/createTestSchema.ts b/src/testing/experimental/createTestSchema.ts
index 5a4002c2902..e07dd923e4e 100644
--- a/src/testing/experimental/createTestSchema.ts
+++ b/src/testing/experimental/createTestSchema.ts
@@ -50,6 +50,8 @@ interface TestSchemaOptions {
  * ```
  * @since 3.9.0
  * @alpha
+ * @deprecated `createTestSchema` is deprecated and will be removed in 3.12.0.
+ * Please migrate to [`@apollo/graphql-testing-library`](https://github.com/apollographql/graphql-testing-library).
  */
 const createTestSchema = (
   schemaWithTypeDefs: GraphQLSchema,