diff --git a/src/middleware/bearer-auth/index.test.ts b/src/middleware/bearer-auth/index.test.ts
index 632d9c9a..8c017f48 100644
--- a/src/middleware/bearer-auth/index.test.ts
+++ b/src/middleware/bearer-auth/index.test.ts
@@ -68,6 +68,163 @@ describe('Bearer Auth by Middleware', () => {
       handlerExecuted = true
       return c.text('auth-custom-header')
     })
+
+    app.use(
+      '/auth-custom-no-authentication-header-message-string/*',
+      bearerAuth({
+        token,
+        noAuthenticationHeaderMessage: 'Custom no authentication header message as string',
+      })
+    )
+    app.get('/auth-custom-no-authentication-header-message-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-no-authentication-header-message-object/*',
+      bearerAuth({
+        token,
+        noAuthenticationHeaderMessage: {
+          message: 'Custom no authentication header message as object',
+        },
+      })
+    )
+    app.get('/auth-custom-no-authentication-header-message-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-no-authentication-header-message-function-string/*',
+      bearerAuth({
+        token,
+        noAuthenticationHeaderMessage: () =>
+          'Custom no authentication header message as function string',
+      })
+    )
+    app.get('/auth-custom-no-authentication-header-message-function-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-no-authentication-header-message-function-object/*',
+      bearerAuth({
+        token,
+        noAuthenticationHeaderMessage: () => ({
+          message: 'Custom no authentication header message as function object',
+        }),
+      })
+    )
+    app.get('/auth-custom-no-authentication-header-message-function-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-authentication-header-message-string/*',
+      bearerAuth({
+        token,
+        invalidAuthenticationHeaderMeasage:
+          'Custom invalid authentication header message as string',
+      })
+    )
+    app.get('/auth-custom-invalid-authentication-header-message-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-authentication-header-message-object/*',
+      bearerAuth({
+        token,
+        invalidAuthenticationHeaderMeasage: {
+          message: 'Custom invalid authentication header message as object',
+        },
+      })
+    )
+    app.get('/auth-custom-invalid-authentication-header-message-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-authentication-header-message-function-string/*',
+      bearerAuth({
+        token,
+        invalidAuthenticationHeaderMeasage: () =>
+          'Custom invalid authentication header message as function string',
+      })
+    )
+    app.get('/auth-custom-invalid-authentication-header-message-function-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-authentication-header-message-function-object/*',
+      bearerAuth({
+        token,
+        invalidAuthenticationHeaderMeasage: () => ({
+          message: 'Custom invalid authentication header message as function object',
+        }),
+      })
+    )
+    app.get('/auth-custom-invalid-authentication-header-message-function-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-token-message-string/*',
+      bearerAuth({
+        token,
+        invalidTokenMessage: 'Custom invalid token message as string',
+      })
+    )
+    app.get('/auth-custom-invalid-token-message-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-token-message-object/*',
+      bearerAuth({
+        token,
+        invalidTokenMessage: { message: 'Custom invalid token message as object' },
+      })
+    )
+    app.get('/auth-custom-invalid-token-message-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-token-message-function-string/*',
+      bearerAuth({
+        token,
+        invalidTokenMessage: () => 'Custom invalid token message as function string',
+      })
+    )
+    app.get('/auth-custom-invalid-token-message-function-string/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
+
+    app.use(
+      '/auth-custom-invalid-token-message-function-object/*',
+      bearerAuth({
+        token,
+        invalidTokenMessage: () => ({
+          message: 'Custom invalid token message as function object',
+        }),
+      })
+    )
+    app.get('/auth-custom-invalid-token-message-function-object/*', (c) => {
+      handlerExecuted = true
+      return c.text('auth')
+    })
   })
 
   it('Should authorize', async () => {
@@ -228,4 +385,144 @@ describe('Bearer Auth by Middleware', () => {
     expect(res.status).toBe(401)
     expect(await res.text()).toBe('Unauthorized')
   })
+
+  it('Should not authorize - custom no authorization header message as string', async () => {
+    const req = new Request('http://localhost/auth-custom-no-authentication-header-message-string')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom no authentication header message as string')
+  })
+
+  it('Should not authorize - custom no authorization header message as object', async () => {
+    const req = new Request('http://localhost/auth-custom-no-authentication-header-message-object')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('{"message":"Custom no authentication header message as object"}')
+  })
+
+  it('Should not authorize - custom no authorization header message as function string', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-no-authentication-header-message-function-string'
+    )
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom no authentication header message as function string')
+  })
+
+  it('Should not authorize - custom no authorization header message as function object', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-no-authentication-header-message-function-object'
+    )
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe(
+      '{"message":"Custom no authentication header message as function object"}'
+    )
+  })
+
+  it('Should not authorize - custom invalid authentication header message as string', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-invalid-authentication-header-message-string'
+    )
+    req.headers.set('Authorization', 'Beare abcdefg12345-._~+/=')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(400)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom invalid authentication header message as string')
+  })
+
+  it('Should not authorize - custom invalid authentication header message as object', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-invalid-authentication-header-message-object'
+    )
+    req.headers.set('Authorization', 'Beare abcdefg12345-._~+/=')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(400)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe(
+      '{"message":"Custom invalid authentication header message as object"}'
+    )
+  })
+
+  it('Should not authorize - custom invalid authentication header message as function string', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-invalid-authentication-header-message-function-string'
+    )
+    req.headers.set('Authorization', 'Beare abcdefg12345-._~+/=')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(400)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom invalid authentication header message as function string')
+  })
+
+  it('Should not authorize - custom invalid authentication header message as function object', async () => {
+    const req = new Request(
+      'http://localhost/auth-custom-invalid-authentication-header-message-function-object'
+    )
+    req.headers.set('Authorization', 'Beare abcdefg12345-._~+/=')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(400)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe(
+      '{"message":"Custom invalid authentication header message as function object"}'
+    )
+  })
+
+  it('Should not authorize - custom invalid token message as string', async () => {
+    const req = new Request('http://localhost/auth-custom-invalid-token-message-string')
+    req.headers.set('Authorization', 'Bearer invalid-token')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom invalid token message as string')
+  })
+
+  it('Should not authorize - custom invalid token message as object', async () => {
+    const req = new Request('http://localhost/auth-custom-invalid-token-message-object')
+    req.headers.set('Authorization', 'Bearer invalid-token')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('{"message":"Custom invalid token message as object"}')
+  })
+
+  it('Should not authorize - custom invalid token message as function string', async () => {
+    const req = new Request('http://localhost/auth-custom-invalid-token-message-function-string')
+    req.headers.set('Authorization', 'Bearer invalid-token')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('Custom invalid token message as function string')
+  })
+
+  it('Should not authorize - custom invalid token message as function object', async () => {
+    const req = new Request('http://localhost/auth-custom-invalid-token-message-function-object')
+    req.headers.set('Authorization', 'Bearer invalid-token')
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(401)
+    expect(res.headers.get('Content-Type')).toMatch('application/json; charset=UTF-8')
+    expect(handlerExecuted).toBeFalsy()
+    expect(await res.text()).toBe('{"message":"Custom invalid token message as function object"}')
+  })
 })
diff --git a/src/middleware/bearer-auth/index.ts b/src/middleware/bearer-auth/index.ts
index 6f6208ba..a8db32f4 100644
--- a/src/middleware/bearer-auth/index.ts
+++ b/src/middleware/bearer-auth/index.ts
@@ -7,11 +7,14 @@ import type { Context } from '../../context'
 import { HTTPException } from '../../http-exception'
 import type { MiddlewareHandler } from '../../types'
 import { timingSafeEqual } from '../../utils/buffer'
+import type { StatusCode } from '../../utils/http-status'
 
 const TOKEN_STRINGS = '[A-Za-z0-9._~+/-]+=*'
 const PREFIX = 'Bearer'
 const HEADER = 'Authorization'
 
+type MessageFunction = (c: Context) => string | object | Promise<string | object>
+
 type BearerAuthOptions =
   | {
       token: string | string[]
@@ -19,6 +22,9 @@ type BearerAuthOptions =
       prefix?: string
       headerName?: string
       hashFunction?: Function
+      noAuthenticationHeaderMessage?: string | object | MessageFunction
+      invalidAuthenticationHeaderMeasage?: string | object | MessageFunction
+      invalidTokenMessage?: string | object | MessageFunction
     }
   | {
       realm?: string
@@ -26,6 +32,9 @@ type BearerAuthOptions =
       headerName?: string
       verifyToken: (token: string, c: Context) => boolean | Promise<boolean>
       hashFunction?: Function
+      noAuthenticationHeaderMessage?: string | object | MessageFunction
+      invalidAuthenticationHeaderMeasage?: string | object | MessageFunction
+      invalidTokenMessage?: string | object | MessageFunction
     }
 
 /**
@@ -40,6 +49,9 @@ type BearerAuthOptions =
  * @param {string} [options.prefix="Bearer"] - The prefix (or known as `schema`) for the Authorization header value. If set to the empty string, no prefix is expected.
  * @param {string} [options.headerName=Authorization] - The header name.
  * @param {Function} [options.hashFunction] - A function to handle hashing for safe comparison of authentication tokens.
+ * @param {string | object | MessageFunction} [options.noAuthenticationHeaderMessage="Unauthorized"] - The no authentication header message.
+ * @param {string | object | MessageFunction} [options.invalidAuthenticationHeaderMeasage="Bad Request"] - The invalid authentication header message.
+ * @param {string | object | MessageFunction} [options.invalidTokenMessage="Unauthorized"] - The invalid token message.
  * @returns {MiddlewareHandler} The middleware handler function.
  * @throws {Error} If neither "token" nor "verifyToken" options are provided.
  * @throws {HTTPException} If authentication fails, with 401 status code for missing or invalid token, or 400 status code for invalid request.
@@ -73,28 +85,50 @@ export const bearerAuth = (options: BearerAuthOptions): MiddlewareHandler => {
   const regexp = new RegExp(`^${prefixRegexStr}(${TOKEN_STRINGS}) *$`)
   const wwwAuthenticatePrefix = options.prefix === '' ? '' : `${options.prefix} `
 
+  const throwHTTPException = async (
+    c: Context,
+    status: StatusCode,
+    wwwAuthenticateHeader: string,
+    messageOption: string | object | MessageFunction
+  ): Promise<Response> => {
+    const headers = {
+      'WWW-Authenticate': wwwAuthenticateHeader,
+    }
+    const responseMessage =
+      typeof messageOption === 'function' ? await messageOption(c) : messageOption
+    const res =
+      typeof responseMessage === 'string'
+        ? new Response(responseMessage, { status, headers })
+        : new Response(JSON.stringify(responseMessage), {
+            status,
+            headers: {
+              ...headers,
+              'content-type': 'application/json; charset=UTF-8',
+            },
+          })
+    throw new HTTPException(status, { res })
+  }
+
   return async function bearerAuth(c, next) {
     const headerToken = c.req.header(options.headerName || HEADER)
     if (!headerToken) {
       // No Authorization header
-      const res = new Response('Unauthorized', {
-        status: 401,
-        headers: {
-          'WWW-Authenticate': `${wwwAuthenticatePrefix}realm="` + realm + '"',
-        },
-      })
-      throw new HTTPException(401, { res })
+      await throwHTTPException(
+        c,
+        401,
+        `${wwwAuthenticatePrefix}realm="${realm}"`,
+        options.noAuthenticationHeaderMessage || 'Unauthorized'
+      )
     } else {
       const match = regexp.exec(headerToken)
       if (!match) {
         // Invalid Request
-        const res = new Response('Bad Request', {
-          status: 400,
-          headers: {
-            'WWW-Authenticate': `${wwwAuthenticatePrefix}error="invalid_request"`,
-          },
-        })
-        throw new HTTPException(400, { res })
+        await throwHTTPException(
+          c,
+          400,
+          `${wwwAuthenticatePrefix}error="invalid_request"`,
+          options.invalidAuthenticationHeaderMeasage || 'Bad Request'
+        )
       } else {
         let equal = false
         if ('verifyToken' in options) {
@@ -111,13 +145,12 @@ export const bearerAuth = (options: BearerAuthOptions): MiddlewareHandler => {
         }
         if (!equal) {
           // Invalid Token
-          const res = new Response('Unauthorized', {
-            status: 401,
-            headers: {
-              'WWW-Authenticate': `${wwwAuthenticatePrefix}error="invalid_token"`,
-            },
-          })
-          throw new HTTPException(401, { res })
+          await throwHTTPException(
+            c,
+            401,
+            `${wwwAuthenticatePrefix}error="invalid_token"`,
+            options.invalidTokenMessage || 'Unauthorized'
+          )
         }
       }
     }