diff --git a/src/__tests__/auth.refresh-token.test.js b/src/__tests__/auth.refresh-token.test.js
new file mode 100644
index 0000000..5d21fce
--- /dev/null
+++ b/src/__tests__/auth.refresh-token.test.js
@@ -0,0 +1,191 @@
+const crypto = require('crypto');
+const request = require('supertest');
+
+jest.mock('../models/User.model', () => ({
+  findById: jest.fn(),
+}));
+
+jest.mock('jsonwebtoken', () => ({
+  verify: jest.fn(),
+  sign: jest.fn(),
+  decode: jest.fn(),
+}));
+
+const User = require('../models/User.model');
+const jwt = require('jsonwebtoken');
+const app = require('../app');
+
+describe('POST /api/auth/refresh-token', () => {
+  beforeAll(() => {
+    process.env.JWT_SECRET = 'test-access-secret';
+    process.env.JWT_REFRESH_SECRET = 'test-refresh-secret';
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('returns new tokens for valid refresh token', async () => {
+    const refreshToken = 'valid-refresh-token';
+    const expectedHash = crypto
+      .createHash('sha256')
+      .update(refreshToken)
+      .digest('hex');
+
+    const user = {
+      _id: '507f1f77bcf86cd799439011',
+      email: 'john@example.com',
+      role: 'user',
+      refreshTokenHash: expectedHash,
+      refreshTokenExpiresAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000), // 7 days from now
+      save: jest.fn().mockResolvedValue(undefined),
+    };
+
+    User.findById.mockReturnValue({
+      select: jest.fn().mockResolvedValue(user),
+    });
+
+    jwt.verify.mockReturnValue({
+      sub: '507f1f77bcf86cd799439011',
+      type: 'refresh',
+    });
+
+    jwt.sign
+      .mockReturnValueOnce('new-access-token')
+      .mockReturnValueOnce('new-refresh-token');
+    jwt.decode.mockReturnValue({ exp: 1735689600 });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken })
+      .expect(200);
+
+    expect(response.body.success).toBe(true);
+    expect(response.body.message).toBe('Token refreshed successfully');
+    expect(response.body.data).toEqual({
+      accessToken: 'new-access-token',
+      refreshToken: 'new-refresh-token',
+    });
+
+    expect(jwt.verify).toHaveBeenCalledWith(
+      refreshToken,
+      'test-refresh-secret'
+    );
+    expect(User.findById).toHaveBeenCalledWith('507f1f77bcf86cd799439011');
+  });
+
+  it('returns 403 for invalid token type', async () => {
+    jwt.verify.mockReturnValue({
+      sub: '507f1f77bcf86cd799439011',
+      type: 'access', // Wrong type
+    });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken: 'access-token' })
+      .expect(403);
+
+    expect(response.body.success).toBe(false);
+    expect(response.body.message).toBe('Invalid token type');
+  });
+
+  it('returns 403 when user not found', async () => {
+    User.findById.mockReturnValue({
+      select: jest.fn().mockResolvedValue(null),
+    });
+
+    jwt.verify.mockReturnValue({
+      sub: '507f1f77bcf86cd799439011',
+      type: 'refresh',
+    });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken: 'valid-refresh-token' })
+      .expect(403);
+
+    expect(response.body.success).toBe(false);
+    expect(response.body.message).toBe('User not found');
+  });
+
+  it('returns 403 when refresh token hash does not match', async () => {
+    const user = {
+      _id: '507f1f77bcf86cd799439011',
+      email: 'john@example.com',
+      role: 'user',
+      refreshTokenHash: 'stored-hash',
+      refreshTokenExpiresAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
+      save: jest.fn(),
+    };
+
+    User.findById.mockReturnValue({
+      select: jest.fn().mockResolvedValue(user),
+    });
+
+    jwt.verify.mockReturnValue({
+      sub: '507f1f77bcf86cd799439011',
+      type: 'refresh',
+    });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken: 'different-refresh-token' })
+      .expect(403);
+
+    expect(response.body.success).toBe(false);
+    expect(response.body.message).toBe('Invalid refresh token');
+  });
+
+  it('returns 403 when refresh token has expired', async () => {
+    const user = {
+      _id: '507f1f77bcf86cd799439011',
+      email: 'john@example.com',
+      role: 'user',
+      refreshTokenHash: 'valid-hash',
+      refreshTokenExpiresAt: new Date(Date.now() - 1000), // Expired
+      save: jest.fn(),
+    };
+
+    User.findById.mockReturnValue({
+      select: jest.fn().mockResolvedValue(user),
+    });
+
+    jwt.verify.mockReturnValue({
+      sub: '507f1f77bcf86cd799439011',
+      type: 'refresh',
+    });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken: 'valid-refresh-token' })
+      .expect(403);
+
+    expect(response.body.success).toBe(false);
+    expect(response.body.message).toBe('Refresh token has expired');
+  });
+
+  it('returns 403 for malformed JWT', async () => {
+    jwt.verify.mockImplementation(() => {
+      const error = new Error('JsonWebTokenError');
+      error.name = 'JsonWebTokenError';
+      throw error;
+    });
+
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({ refreshToken: 'malformed-token' })
+      .expect(403);
+
+    expect(response.body.success).toBe(false);
+    expect(response.body.message).toBe('Invalid or expired refresh token');
+  });
+
+  it('returns 400 when refresh token is missing', async () => {
+    const response = await request(app)
+      .post('/api/auth/refresh-token')
+      .send({})
+      .expect(400);
+
+    expect(response.body.success).toBe(false);
+  });
+});
diff --git a/src/controllers/auth.controller.js b/src/controllers/auth.controller.js
index d972670..329f03d 100644
--- a/src/controllers/auth.controller.js
+++ b/src/controllers/auth.controller.js
@@ -289,7 +289,10 @@ const forgotPassword = async (req, res, next) => {
     }
 
     const resetToken = crypto.randomBytes(32).toString('hex');
-    const resetTokenHash = crypto.createHash('sha256').update(resetToken).digest('hex');
+    const resetTokenHash = crypto
+      .createHash('sha256')
+      .update(resetToken)
+      .digest('hex');
 
     user.resetPasswordToken = resetTokenHash;
     user.resetPasswordExpires = new Date(Date.now() + 60 * 60 * 1000); // 1 hour
@@ -310,7 +313,9 @@ const forgotPassword = async (req, res, next) => {
       user.resetPasswordExpires = null;
       await user.save();
 
-      const error = new Error('Failed to send password reset email. Please try again later.');
+      const error = new Error(
+        'Failed to send password reset email. Please try again later.'
+      );
       error.statusCode = 500;
       error.isOperational = true;
       return next(error);
@@ -322,6 +327,119 @@ const forgotPassword = async (req, res, next) => {
   }
 };
 
+/**
+ * Refresh access token using a valid refresh token
+ * POST /api/auth/refresh-token
+ */
+const refreshToken = async (req, res, next) => {
+  try {
+    const { refreshToken } = req.body;
+
+    // Verify the refresh token
+    const decodedRefreshToken = jwt.verify(
+      refreshToken,
+      process.env.JWT_REFRESH_SECRET
+    );
+
+    if (decodedRefreshToken.type !== 'refresh') {
+      const error = new Error('Invalid token type');
+      error.statusCode = 403;
+      error.isOperational = true;
+      return next(error);
+    }
+
+    // Find the user and include the refresh token hash
+    const user = await User.findById(decodedRefreshToken.sub).select(
+      '+refreshTokenHash +refreshTokenExpiresAt'
+    );
+
+    if (!user) {
+      const error = new Error('User not found');
+      error.statusCode = 403;
+      error.isOperational = true;
+      return next(error);
+    }
+
+    // Check if refresh token has expired
+    if (user.refreshTokenExpiresAt && user.refreshTokenExpiresAt < new Date()) {
+      const error = new Error('Refresh token has expired');
+      error.statusCode = 403;
+      error.isOperational = true;
+      return next(error);
+    }
+
+    // Hash the provided refresh token and compare with stored hash
+    const refreshTokenHash = crypto
+      .createHash('sha256')
+      .update(refreshToken)
+      .digest('hex');
+
+    if (user.refreshTokenHash !== refreshTokenHash) {
+      const error = new Error('Invalid refresh token');
+      error.statusCode = 403;
+      error.isOperational = true;
+      return next(error);
+    }
+
+    // Generate new access token
+    const accessTokenExpiresIn = process.env.JWT_EXPIRES_IN || '15m';
+    const newAccessToken = jwt.sign(
+      {
+        sub: user._id.toString(),
+        email: user.email,
+        role: user.role,
+        type: 'access',
+      },
+      process.env.JWT_SECRET,
+      { expiresIn: accessTokenExpiresIn }
+    );
+
+    // Optionally rotate the refresh token
+    const refreshTokenExpiresIn = process.env.JWT_REFRESH_EXPIRES_IN || '7d';
+    const newRefreshToken = jwt.sign(
+      { sub: user._id.toString(), type: 'refresh' },
+      process.env.JWT_REFRESH_SECRET,
+      { expiresIn: refreshTokenExpiresIn }
+    );
+
+    // Hash the new refresh token and update user record
+    const newRefreshTokenHash = crypto
+      .createHash('sha256')
+      .update(newRefreshToken)
+      .digest('hex');
+
+    const newDecodedRefreshToken = jwt.decode(newRefreshToken);
+
+    user.refreshTokenHash = newRefreshTokenHash;
+    user.refreshTokenExpiresAt = newDecodedRefreshToken?.exp
+      ? new Date(newDecodedRefreshToken.exp * 1000)
+      : null;
+
+    await user.save();
+
+    return sendSuccess(
+      res,
+      {
+        accessToken: newAccessToken,
+        refreshToken: newRefreshToken,
+      },
+      200,
+      'Token refreshed successfully'
+    );
+  } catch (error) {
+    if (
+      error.name === 'JsonWebTokenError' ||
+      error.name === 'TokenExpiredError'
+    ) {
+      const tokenError = new Error('Invalid or expired refresh token');
+      tokenError.statusCode = 403;
+      tokenError.isOperational = true;
+      return next(tokenError);
+    }
+    return next(error);
+  }
+};
+
 module.exports = {
   register,
   login,
@@ -329,4 +447,5 @@ module.exports = {
   resetPassword,
   forgotPassword,
   verifyEmail,
+  refreshToken,
 };
diff --git a/src/routes/auth.routes.js b/src/routes/auth.routes.js
index 34cf8f8..5e5d799 100644
--- a/src/routes/auth.routes.js
+++ b/src/routes/auth.routes.js
@@ -6,6 +6,7 @@ const {
   resetPassword,
   forgotPassword,
   verifyEmail,
+  refreshToken,
 } = require('../controllers/auth.controller');
 const validate = require('../middlewares/validate');
 const authenticate = require('../middlewares/auth');
@@ -14,6 +15,7 @@ const {
   loginSchema,
   resetPasswordSchema,
   forgotPasswordSchema,
+  refreshTokenSchema,
 } = require('../validators/auth.validators');
 
 const router = express.Router();
@@ -31,9 +33,16 @@ router.post('/logout', authenticate, logout);
 router.post('/forgot-password', validate(forgotPasswordSchema), forgotPassword);
 
 // PATCH /api/auth/reset-password/:token - Reset user password with token
-router.patch('/reset-password/:token', validate(resetPasswordSchema), resetPassword);
+router.patch(
+  '/reset-password/:token',
+  validate(resetPasswordSchema),
+  resetPassword
+);
 
 // GET /api/auth/verify-email/:token - Verify email address using token from verification email
 router.get('/verify-email/:token', verifyEmail);
 
+// POST /api/auth/refresh-token - Refresh access token using refresh token
+router.post('/refresh-token', validate(refreshTokenSchema), refreshToken);
+
 module.exports = router;
diff --git a/src/validators/auth.validators.js b/src/validators/auth.validators.js
index 8520c6c..65ca5a6 100644
--- a/src/validators/auth.validators.js
+++ b/src/validators/auth.validators.js
@@ -45,9 +45,17 @@ const forgotPasswordSchema = Joi.object({
   }),
 });
 
+const refreshTokenSchema = Joi.object({
+  refreshToken: Joi.string().required().messages({
+    'any.required': 'Refresh token is required',
+    'string.empty': 'Refresh token cannot be empty',
+  }),
+});
+
 module.exports = {
   registerSchema,
   loginSchema,
   resetPasswordSchema,
   forgotPasswordSchema,
+  refreshTokenSchema,
 };