diff --git a/.changeset/honest-comics-ring.md b/.changeset/honest-comics-ring.md
new file mode 100644
index 0000000000..38a962c5d3
--- /dev/null
+++ b/.changeset/honest-comics-ring.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-todo-backend': patch
+---
+
+Added OpenAPI schema
diff --git a/plugins/todo-backend/package.json b/plugins/todo-backend/package.json
index d98a44f874..9385ec0ee6 100644
--- a/plugins/todo-backend/package.json
+++ b/plugins/todo-backend/package.json
@@ -45,6 +45,7 @@
     "yn": "^4.0.0"
   },
   "devDependencies": {
+    "@backstage/backend-openapi-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@types/supertest": "^2.0.8",
     "msw": "^1.0.0",
diff --git a/plugins/todo-backend/src/schema/openapi.generated.ts b/plugins/todo-backend/src/schema/openapi.generated.ts
new file mode 100644
index 0000000000..54486a5615
--- /dev/null
+++ b/plugins/todo-backend/src/schema/openapi.generated.ts
@@ -0,0 +1,208 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ******************************************************************
+// * THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY. *
+// ******************************************************************
+
+export default {
+  openapi: '3.0.3',
+  info: {
+    title: '@backstage/plugin-todo-backend',
+    version: '1',
+    description:
+      'The Backstage backend plugin that provides source code todo comment browsing.',
+    license: {
+      name: 'Apache-2.0',
+      url: 'http://www.apache.org/licenses/LICENSE-2.0.html',
+    },
+    contact: {},
+  },
+  servers: [
+    {
+      url: '/',
+    },
+  ],
+  components: {
+    examples: {},
+    headers: {},
+    parameters: {},
+    requestBodies: {},
+    responses: {},
+    schemas: {
+      TodoItem: {
+        type: 'object',
+        properties: {
+          text: {
+            type: 'string',
+            description: 'The contents of the TODO comment',
+          },
+          tag: {
+            type: 'string',
+            description: 'The tag used, e.g. TODO, FIXME',
+          },
+          author: {
+            type: 'string',
+            description: 'References author, if any',
+          },
+          viewUrl: {
+            type: 'string',
+            description: 'URL used to view the file',
+          },
+          lineNumber: {
+            type: 'integer',
+            description: 'The line number of the file that the TODO occurs at',
+          },
+          repoFilePath: {
+            type: 'string',
+            description:
+              'The path of the file containing the TODO within the repo',
+          },
+        },
+        required: ['text', 'tag'],
+        additionalProperties: false,
+      },
+    },
+    securitySchemes: {
+      JWT: {
+        type: 'http',
+        scheme: 'bearer',
+        bearerFormat: 'JWT',
+      },
+    },
+  },
+  paths: {
+    '/v1/todos': {
+      get: {
+        operationId: 'ListTodos',
+        responses: {
+          '200': {
+            description: 'Ok',
+            content: {
+              'application/json': {
+                schema: {
+                  type: 'object',
+                  properties: {
+                    items: {
+                      type: 'array',
+                      items: {
+                        $ref: '#/components/schemas/TodoItem',
+                      },
+                    },
+                    totalCount: {
+                      type: 'integer',
+                    },
+                    offset: {
+                      type: 'integer',
+                    },
+                    limit: {
+                      type: 'integer',
+                    },
+                  },
+                  required: ['items', 'totalCount', 'offset', 'limit'],
+                  additionalProperties: false,
+                },
+              },
+            },
+          },
+          '400': {
+            description: 'Bad request',
+            content: {
+              'application/json': {
+                schema: {
+                  type: 'object',
+                  properties: {
+                    error: {
+                      type: 'object',
+                      properties: {
+                        message: {
+                          type: 'string',
+                        },
+                      },
+                    },
+                  },
+                },
+              },
+            },
+          },
+        },
+        security: [
+          {},
+          {
+            JWT: [],
+          },
+        ],
+        parameters: [
+          {
+            name: 'entity',
+            in: 'query',
+            required: true,
+            schema: {
+              type: 'string',
+              minLength: 1,
+              description: 'A reference to the entity to list TODO items for',
+            },
+          },
+          {
+            name: 'orderBy',
+            in: 'query',
+            required: false,
+            schema: {
+              type: 'string',
+              pattern: '^(text|tag|author|viewUrl|repoFilePath)=(asc|desc)$',
+              description:
+                'The field and direction used to sort the listed TODO items',
+            },
+          },
+          {
+            name: 'filter',
+            in: 'query',
+            required: false,
+            schema: {
+              type: 'array',
+              description:
+                'A list of filters used to narrow down the listed TODO items',
+              items: {
+                type: 'string',
+                pattern: '^(text|tag|author|viewUrl|repoFilePath)=.+$',
+              },
+            },
+          },
+          {
+            name: 'offset',
+            in: 'query',
+            required: false,
+            schema: {
+              type: 'integer',
+              minimum: 0,
+              description: 'The offset at which to start listing TODO items',
+            },
+          },
+          {
+            name: 'limit',
+            in: 'query',
+            required: false,
+            schema: {
+              type: 'integer',
+              minimum: 1,
+              description: 'The number of TODO items to list',
+            },
+          },
+        ],
+      },
+    },
+  },
+} as const;
diff --git a/plugins/todo-backend/src/schema/openapi.yaml b/plugins/todo-backend/src/schema/openapi.yaml
new file mode 100644
index 0000000000..3fba129644
--- /dev/null
+++ b/plugins/todo-backend/src/schema/openapi.yaml
@@ -0,0 +1,132 @@
+openapi: 3.0.3
+
+info:
+  title: '@backstage/plugin-todo-backend'
+  version: '1'
+  description: The Backstage backend plugin that provides source code todo comment browsing.
+  license:
+    name: Apache-2.0
+    url: http://www.apache.org/licenses/LICENSE-2.0.html
+  contact: {}
+
+servers:
+  - url: /
+
+components:
+  examples: {}
+  headers: {}
+  parameters: {}
+  requestBodies: {}
+  responses: {}
+  schemas:
+    TodoItem:
+      type: object
+      properties:
+        text:
+          type: string
+          description: The contents of the TODO comment
+        tag:
+          type: string
+          description: The tag used, e.g. TODO, FIXME
+        author:
+          type: string
+          description: References author, if any
+        viewUrl:
+          type: string
+          description: URL used to view the file
+        lineNumber:
+          type: integer
+          description: The line number of the file that the TODO occurs at
+        repoFilePath:
+          type: string
+          description: The path of the file containing the TODO within the repo
+      required:
+        - text
+        - tag
+      additionalProperties: false
+  securitySchemes:
+    JWT:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+paths:
+  /v1/todos:
+    get:
+      operationId: ListTodos
+      responses:
+        '200':
+          description: Ok
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  items:
+                    type: array
+                    items:
+                      $ref: '#/components/schemas/TodoItem'
+                  totalCount:
+                    type: integer
+                  offset:
+                    type: integer
+                  limit:
+                    type: integer
+                required:
+                  - items
+                  - totalCount
+                  - offset
+                  - limit
+                additionalProperties: false
+        '400':
+          description: Bad request
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  error:
+                    type: object
+                    properties:
+                      message:
+                        type: string
+      security:
+        - {}
+        - JWT: []
+      parameters:
+        - name: entity
+          in: query
+          required: true
+          schema:
+            type: string
+            minLength: 1
+            description: A reference to the entity to list TODO items for
+        - name: orderBy
+          in: query
+          required: false
+          schema:
+            type: string
+            pattern: '^(text|tag|author|viewUrl|repoFilePath)=(asc|desc)$'
+            description: The field and direction used to sort the listed TODO items
+        - name: filter
+          in: query
+          required: false
+          schema:
+            type: array
+            description: A list of filters used to narrow down the listed TODO items
+            items:
+              type: string
+              pattern: '^(text|tag|author|viewUrl|repoFilePath)=.+$'
+        - name: offset
+          in: query
+          required: false
+          schema:
+            type: integer
+            minimum: 0
+            description: The offset at which to start listing TODO items
+        - name: limit
+          in: query
+          required: false
+          schema:
+            type: integer
+            minimum: 1
+            description: The number of TODO items to list
diff --git a/plugins/todo-backend/src/service/router.ts b/plugins/todo-backend/src/service/router.ts
index 5954fab009..364cbef6b0 100644
--- a/plugins/todo-backend/src/service/router.ts
+++ b/plugins/todo-backend/src/service/router.ts
@@ -25,6 +25,8 @@ import {
   parseIntegerParam,
   parseOrderByParam,
 } from '../lib/utils';
+import spec from '../schema/openapi.generated';
+import type { ApiRouter } from '@backstage/backend-openapi-utils';
 
 /** @public */
 export interface RouterOptions {
@@ -37,7 +39,7 @@ export async function createRouter(
 ): Promise<express.Router> {
   const { todoService } = options;
 
-  const router = Router();
+  const router = Router() as ApiRouter<typeof spec>;
   router.use(express.json());
 
   router.get('/v1/todos', async (req, res) => {
diff --git a/yarn.lock b/yarn.lock
index c6a18d61a5..10b595c716 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9564,6 +9564,7 @@ __metadata:
   resolution: "@backstage/plugin-todo-backend@workspace:plugins/todo-backend"
   dependencies:
     "@backstage/backend-common": "workspace:^"
+    "@backstage/backend-openapi-utils": "workspace:^"
     "@backstage/backend-plugin-api": "workspace:^"
     "@backstage/catalog-client": "workspace:^"
     "@backstage/catalog-model": "workspace:^"