A new flap of the buttock and posterior thigh has been developed for closure of wounds of the perineal and postsacral regions. Flap anatomy and operation technique are described. Five patients with difficult wounds were selected to demonstrate the versatility and range of this flap. In 40 patients under 65 years of age with a variety of buttock and perineal wounds, there have been no appreciable wound-healing problems with use of this flap.