William McCoy
William McCoy or MacCoy may refer to:
- W. F. McCoy, Speaker of the Northern Ireland House of Commons
- William McCoy , American rum-runner during Prohibition
- William McCoy , American politician and member of Congress
- William McCoy , Scottish mutineer on HMS Bounty
- William McCoy , American politician and member of the Oregon Legislative Assembly
- William D. McCoy, American diplomat
- William F. MacCoy, lawyer and politician in Nova Scotia, Canada
- William J. McCoy , American composer
- William J. McCoy , American politician and Speaker of the Mississippi House of Representatives
- William John McCoy, American politician and member of the Wisconsin State Assembly
- Willie McCoy , rapper
- Bill McCoy , New Zealand cricketer