William Mackey

• William Mackey (Fenian), member of the Fenian Brotherhood and the Clan na Gael
• William Mackey (Jesuit), Canadian Jesuit educationist and founder of the modern educational system of Bhutan
• William F. Mackey, American lawyer and politician from New York
• William Davis Mackey, American lawyer and politician from Indiana
• Bill Mackey, American racecar driver