diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2834f9d..f38cd88a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added `POST /_plugins/_ml/memory`, `POST /_plugins/_ml/memory/_search`, `{memory_id}/_search`, `{memory_id}/messages`, `PUT /_plugins/_ml/memory/{memory_id}`, `message/{message_id}`,  `GET /_plugins/_ml/memory`, `GET /_plugins/_ml/memory/{memory_id}`, `_search`, `message/{message_id}`, `{memory_id}/messages`, `{memory_id}/_search`, `message/{message_id}/traces`,  and `DELETE /_plugins/_ml/memory/{memory_id}` ([#771](https://github.com/opensearch-project/opensearch-api-specification/pull/771))
 - Added support for evaluating response payloads in prologues and epilogues ([#772](https://github.com/opensearch-project/opensearch-api-specification/pull/772))
 - Added `GET /_plugins/_ml/models/{model_id}`, `POST /_plugins/_ml/models/_search`, `POST /_plugins/_ml/models/_unload`, `_undeploy`, `_upload`, `meta`, `_register_meta`, `POST /_plugins/_ml/models/{model_id}/_load`, `_predict`, `_unload`, `chunk/{chunk_number}`, `upload_chunk/{chunk_number}`, and `PUT /_plugins/_ml/models/{model_id}` ([#733](https://github.com/opensearch-project/opensearch-api-specification/pull/733))
+- Added `GET`, `POST`, `PUT`, `DELETE /_plugins/_ml/controllers/{model_id}` ([#779](https://github.com/opensearch-project/opensearch-api-specification/pull/779))
 
 ### Removed
 - Removed unsupported `_common.mapping:SourceField`'s `mode` field and associated `_common.mapping:SourceFieldMode` enum ([#652](https://github.com/opensearch-project/opensearch-api-specification/pull/652))
diff --git a/spec/namespaces/ml.yaml b/spec/namespaces/ml.yaml
index bae59a07..06f16daf 100644
--- a/spec/namespaces/ml.yaml
+++ b/spec/namespaces/ml.yaml
@@ -585,6 +585,51 @@ paths:
       responses:
         '200':
           $ref: '#/components/responses/ml.get_message_traces@200'
+  /_plugins/_ml/controllers/{model_id}:
+    get:
+      operationId: ml.get_controller.0
+      x-operation-group: ml.get_controller
+      x-version-added: '2.12'
+      description: Retrieves a controller.
+      parameters:
+        - $ref: '#/components/parameters/ml.get_controller::path.model_id'
+      responses:
+        '200':
+          $ref: '#/components/responses/ml.get_controller@200'
+    post:
+      operationId: ml.create_controller.0
+      x-operation-group: ml.create_controller
+      x-version-added: '2.12'
+      description: Creates a controller.
+      requestBody:
+        $ref: '#/components/requestBodies/ml.create_controller'
+      parameters:
+        - $ref: '#/components/parameters/ml.create_controller::path.model_id'
+      responses:
+        '200':
+          $ref: '#/components/responses/ml.create_controller@200'
+    put:
+      operationId: ml.update_controller.0
+      x-operation-group: ml.update_controller
+      x-version-added: '2.12'
+      description: Updates a controller.
+      requestBody:
+        $ref: '#/components/requestBodies/ml.update_controller'
+      parameters:
+        - $ref: '#/components/parameters/ml.update_controller::path.model_id'
+      responses:
+        '200':
+          $ref: '#/components/responses/ml.update_controller@200'
+    delete:
+      operationId: ml.delete_controller.0
+      x-operation-group: ml.delete_controller
+      x-version-added: '2.12'
+      description: Deletes a controller.
+      parameters:
+        - $ref: '#/components/parameters/ml.delete_controller::path.model_id'
+      responses:
+        '200':
+          $ref: '#/components/responses/ml.delete_controller@200'
 components:
   requestBodies:
     ml.register_model_group:
@@ -1171,6 +1216,24 @@ components:
                 items:
                   $ref: '../schemas/ml._common.yaml#/components/schemas/SortMessage'
                 description: The sort order.
+    ml.create_controller:
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              user_rate_limiter:
+                $ref: '../schemas/ml._common.yaml#/components/schemas/UserRateLimiter'
+    ml.update_controller:
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              user_rate_limiter:
+                $ref: '../schemas/ml._common.yaml#/components/schemas/UserRateLimiter'
+              model_id:
+                $ref: '../schemas/_common.yaml#/components/schemas/Name'
   responses:
     ml.register_model_group@200:
       content:
@@ -1478,6 +1541,36 @@ components:
         application/json:
           schema:
             $ref: '../schemas/ml._common.yaml#/components/schemas/GetMessageTracesResponse'
+    ml.get_controller@200:
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              user_rate_limiter:
+                $ref: '../schemas/ml._common.yaml#/components/schemas/UserRateLimiter'
+              model_id:
+                $ref: '../schemas/_common.yaml#/components/schemas/Name'
+    ml.create_controller@200:
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              model_id:
+                $ref: '../schemas/_common.yaml#/components/schemas/Name'
+              status:
+                $ref: '../schemas/ml._common.yaml#/components/schemas/Status'
+    ml.update_controller@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/WriteResponseBase'
+    ml.delete_controller@200:
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/_common.yaml#/components/schemas/WriteResponseBase'
   parameters:
     ml.get_model_group::path.model_group_id:
       name: model_group_id
@@ -1683,5 +1776,29 @@ components:
       name: message_id
       in: path
       required: true
+      schema:
+        type: string
+    ml.get_controller::path.model_id:
+      name: model_id
+      in: path
+      required: true
+      schema:
+        type: string
+    ml.create_controller::path.model_id:
+      name: model_id
+      in: path
+      required: true
+      schema:
+        type: string
+    ml.update_controller::path.model_id:
+      name: model_id
+      in: path
+      required: true
+      schema:
+        type: string
+    ml.delete_controller::path.model_id:
+      name: model_id
+      in: path
+      required: true
       schema:
         type: string
\ No newline at end of file
diff --git a/spec/schemas/ml._common.yaml b/spec/schemas/ml._common.yaml
index 281fe255..3a043bb6 100644
--- a/spec/schemas/ml._common.yaml
+++ b/spec/schemas/ml._common.yaml
@@ -1233,4 +1233,27 @@ components:
         traces:
           type: array
           items:
-            $ref: '#/components/schemas/Message'
\ No newline at end of file
+            $ref: '#/components/schemas/Message'
+    UserRateLimiter:
+      type: object
+      properties:
+        user1:
+          $ref: '#/components/schemas/User'
+      additionalProperties: true
+    User:
+      type: object
+      properties:
+        limit:
+          type: [integer, string]
+          description: Max Predict API calls per user per time unit.
+        unit:
+          type: string
+          description: The unit of time.
+          enum:
+            - DAYS
+            - HOURS
+            - MICROSECONDS
+            - MILLISECONDS
+            - MINUTES
+            - NANOSECONDS
+            - SECONDS
\ No newline at end of file
diff --git a/tests/plugins/ml/ml/controller/create.yaml b/tests/plugins/ml/ml/controller/create.yaml
new file mode 100644
index 00000000..2e1f6d30
--- /dev/null
+++ b/tests/plugins/ml/ml/controller/create.yaml
@@ -0,0 +1,65 @@
+$schema: ../../../../../json_schemas/test_story.schema.yaml
+
+description: Test the creation of a controller.
+version: '>= 2.12'
+prologues:
+  - path: /_plugins/_ml/models/_register
+    id: register_model
+    method: POST
+    request:
+      payload:
+        name: huggingface/sentence-transformers/msmarco-distilbert-base-tas-b
+        version: 1.0.1
+        model_format: TORCH_SCRIPT
+    output:
+      task_id: payload.task_id
+  - path: /_plugins/_ml/tasks/{task_id}
+    id: get_completed_task
+    method: GET
+    parameters:
+      task_id: ${register_model.task_id}
+    retry:
+      count: 3
+      wait: 10000
+    response:
+      status: 200
+      payload:
+        state: COMPLETED
+    output:
+      model_id: payload.model_id
+epilogues:
+  - path: /_plugins/_ml/controllers/{model_id}
+    parameters:
+      model_id: ${create_controller.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/models/{model_id}
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/tasks/{task_id}
+    parameters:
+      task_id: ${register_model.task_id}
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Create a controller.
+    id: create_controller
+    path: /_plugins/_ml/controllers/{model_id}
+    method: POST
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    request:
+      payload:
+        user_rate_limiter:
+          user1:
+            limit: 4
+            unit: MINUTES
+          user2:
+            limit: 4
+            unit: MINUTES
+    response:
+      status: 200
+    output:
+      model_id: payload.model_id
diff --git a/tests/plugins/ml/ml/controller/delete.yaml b/tests/plugins/ml/ml/controller/delete.yaml
new file mode 100644
index 00000000..9e7426aa
--- /dev/null
+++ b/tests/plugins/ml/ml/controller/delete.yaml
@@ -0,0 +1,69 @@
+$schema: ../../../../../json_schemas/test_story.schema.yaml
+
+description: Test the deletion of a controller.
+version: '>= 2.12'
+prologues:
+  - path: /_plugins/_ml/models/_register
+    id: register_model
+    method: POST
+    request:
+      payload:
+        name: huggingface/sentence-transformers/msmarco-distilbert-base-tas-b
+        version: 1.0.1
+        model_format: TORCH_SCRIPT
+    output:
+      task_id: payload.task_id
+  - path: /_plugins/_ml/tasks/{task_id}
+    id: get_completed_task
+    method: GET
+    parameters:
+      task_id: ${register_model.task_id}
+    retry:
+      count: 3
+      wait: 10000
+    response:
+      status: 200
+      payload:
+        state: COMPLETED
+    output:
+      model_id: payload.model_id
+  - path: /_plugins/_ml/controllers/{model_id}
+    id: create_controller
+    method: POST
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    request:
+      payload:
+        user_rate_limiter:
+          user1:
+            limit: 4
+            unit: MINUTES
+          user2:
+            limit: 4
+            unit: MINUTES
+    output:
+      model_id: payload.model_id
+epilogues:
+  - path: /_plugins/_ml/controllers/{model_id}
+    parameters:
+      model_id: ${create_controller.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/models/{model_id}
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/tasks/{task_id}
+    parameters:
+      task_id: ${register_model.task_id}
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Delete a controller.
+    path: /_plugins/_ml/controllers/{model_id}
+    method: DELETE
+    parameters:
+      model_id: ${create_controller.model_id}
+    response:
+      status: 200
\ No newline at end of file
diff --git a/tests/plugins/ml/ml/controller/get.yaml b/tests/plugins/ml/ml/controller/get.yaml
new file mode 100644
index 00000000..0707953c
--- /dev/null
+++ b/tests/plugins/ml/ml/controller/get.yaml
@@ -0,0 +1,69 @@
+$schema: ../../../../../json_schemas/test_story.schema.yaml
+
+description: Test the retrieval of a controller.
+version: '>= 2.12'
+prologues:
+  - path: /_plugins/_ml/models/_register
+    id: register_model
+    method: POST
+    request:
+      payload:
+        name: huggingface/sentence-transformers/msmarco-distilbert-base-tas-b
+        version: 1.0.1
+        model_format: TORCH_SCRIPT
+    output:
+      task_id: payload.task_id
+  - path: /_plugins/_ml/tasks/{task_id}
+    id: get_completed_task
+    method: GET
+    parameters:
+      task_id: ${register_model.task_id}
+    retry:
+      count: 3
+      wait: 10000
+    response:
+      status: 200
+      payload:
+        state: COMPLETED
+    output:
+      model_id: payload.model_id
+  - path: /_plugins/_ml/controllers/{model_id}
+    id: create_controller
+    method: POST
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    request:
+      payload:
+        user_rate_limiter:
+          user1:
+            limit: 4
+            unit: MINUTES
+          user2:
+            limit: 4
+            unit: MINUTES
+    output:
+      model_id: payload.model_id
+epilogues:
+  - path: /_plugins/_ml/controllers/{model_id}
+    parameters:
+      model_id: ${create_controller.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/models/{model_id}
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/tasks/{task_id}
+    parameters:
+      task_id: ${register_model.task_id}
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Get a controller.
+    path: /_plugins/_ml/controllers/{model_id}
+    method: GET
+    parameters:
+      model_id: ${create_controller.model_id}
+    response:
+      status: 200
\ No newline at end of file
diff --git a/tests/plugins/ml/ml/controller/update.yaml b/tests/plugins/ml/ml/controller/update.yaml
new file mode 100644
index 00000000..a259d74b
--- /dev/null
+++ b/tests/plugins/ml/ml/controller/update.yaml
@@ -0,0 +1,75 @@
+$schema: ../../../../../json_schemas/test_story.schema.yaml
+
+description: Test updating a controller.
+version: '>= 2.12'
+prologues:
+  - path: /_plugins/_ml/models/_register
+    id: register_model
+    method: POST
+    request:
+      payload:
+        name: huggingface/sentence-transformers/msmarco-distilbert-base-tas-b
+        version: 1.0.1
+        model_format: TORCH_SCRIPT
+    output:
+      task_id: payload.task_id
+  - path: /_plugins/_ml/tasks/{task_id}
+    id: get_completed_task
+    method: GET
+    parameters:
+      task_id: ${register_model.task_id}
+    retry:
+      count: 3
+      wait: 10000
+    response:
+      status: 200
+      payload:
+        state: COMPLETED
+    output:
+      model_id: payload.model_id
+  - path: /_plugins/_ml/controllers/{model_id}
+    id: create_controller
+    method: POST
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    request:
+      payload:
+        user_rate_limiter:
+          user1:
+            limit: 4
+            unit: MINUTES
+          user2:
+            limit: 4
+            unit: MINUTES
+    output:
+      model_id: payload.model_id
+epilogues:
+  - path: /_plugins/_ml/controllers/{model_id}
+    parameters:
+      model_id: ${create_controller.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/models/{model_id}
+    parameters:
+      model_id: ${get_completed_task.model_id}
+    method: DELETE
+    status: [200, 404]
+  - path: /_plugins/_ml/tasks/{task_id}
+    parameters:
+      task_id: ${register_model.task_id}
+    method: DELETE
+    status: [200, 404]
+chapters:
+  - synopsis: Update a controller.
+    path: /_plugins/_ml/controllers/{model_id}
+    method: PUT
+    parameters:
+      model_id: ${create_controller.model_id}
+    request:
+      payload:
+        user_rate_limiter:
+          user1:
+            limit: 6
+            unit: MINUTES
+    response:
+      status: 200