William Duncan
William Duncan may refer to:
Arts, entertainment, and literature
- William Cary Duncan, American playwright and author
- William Duncan (actor), Scottish-born actor and director of film serials
- W. Murdoch Duncan, Scottish crime thriller author
- William "Willie" Duncan, guitarist and singer with the Spider Murphy Gang
Medicine and science
- Sir William Duncan, 1st Baronet, Scottish physician
- William Duncan (American physician)
- William Henry Duncan, English doctor and Britain's first Chief Medical Officer
- William Jolly Duncan, Scottish physicist
- William Duncan MacMillan, American mathematician and astronomer
Politicians
- William Addison Duncan, U.S. Representative from Pennsylvania
- William C. Duncan, brewer, politician, and mayor of Detroit, Michigan
- William Duncan (Maryland politician), American politician and lawyer
- William Garnett Duncan, U.S. Representative from Kentucky
- William Duncan Connor, lieutenant governor of Wisconsin
- William H. Duncan, American diplomat
Sports
- Art Duncan, Canadian ice hockey professional and World War I flying ace
- Bill Duncan, Scottish footballer
- William Butler Duncan II, American yachtsman and adoptive son of William Butler Duncan I
- William Dow Duncan, New Zealand rugby player
- William Duncan (Australian cricketer), Australian cricketer
- William Duncan (footballer), Scottish association football player
- William Duncan (New Zealand cricketer), New Zealand cricketer
- Willie Duncan (rugby union), Irish international rugby union player from Northern Ireland
Others
- W. Butler Duncan I, Scottish-American banker and railroad executive
- William Augustine Duncan, Scottish journalist and colonial official
- William Barr McKinnon Duncan, Scottish-born director of Imperial Chemical Industries, chief executive of Rolls-Royce
- William Duncan (missionary), English-born Anglican missionary
- William Duncan (philosopher), Scottish natural philosopher and classicist
- William fitz Duncan, Scottish prince and general
- William Wallace Duncan, American bishop of the Methodist Episcopal Church, South