William Haywood may refer to:
- William Dudley Haywood (1869–1928), American union leader, "Big Bill Haywood"
- William Henry Haywood, Jr. (1801–1852), North Carolina senator
- William Haywood (architect) (1876–1957), British architect and town planner
- William Haywood (cricketer) (1841–1912), British cricketer
- William Haywood (engineer) (1821–1894), British Surveyor and Engineer to the City of London Commissioners of Sewers