Disclosed herein is footwear having an ankle support. The footwear has a sole, an upper, and a heel section. The ankle support is worn to surround part of the foot and part of the leg between which an ankle joint is located, wherein a lower portion of the ankle support is secured to an interior of the footwear. According to this invention, the wearer's ankle joint moves together with the ankle support without being constrained by the footwear, thus ensuring the flexible movement of the ankle, therefore allowing unrestricted motion. Further, the lower portion of the ankle support is attached to the interior of the footwear, thus allowing the wearer's ankle to be supported by both the footwear and the ankle support, therefore efficiently supporting the ankle, even when large shocks are applied to the ankle due to intense activity.