The Hopman Cup XXI (also known as the Hyundai Hopman Cup for sponsorship reasons) corresponds to the 21st edition of the Hopman Cup tournament between nations in men's and women's tennis.

The nations were split into two pools of four in a round robin format, with the group winners contesting the final.

The United States were the defending champions and they were invited to compete again.

Chinese Taipei qualified for the event by winning the Asian Hopman Cup.

Slovakia won their third title, defeating Russia in the final 2–0.