William Duncan
William Duncan is the name of the following people:
- William Duncan (missionary) (1832-1918), English missionary
- William Duncan (actor) (1879–1961), Scottish actor and director
- William Duncan (soccer player) (born 1913), Scottish soccer player
- William Addison Duncan (1836-1884), American politician
- William C. Duncan (1820–1877), American politician
- William Murdoch Duncan (1909–1975), Scottish writer
