William Duncan

• Art Duncan
• Bill Duncan
• Garnett Duncan
• Sir William Duncan, 1st Baronet
• W. Butler Duncan
• W. Murdoch Duncan
• William Addison Duncan
• William Augustine Duncan
• William Barr McKinnon Duncan
• William Butler Duncan
• William C. Duncan
• William Dow Duncan
• William Duncan (actor)
• William Duncan (footballer)
• William Duncan (missionary)
• William Duncan (philosopher)
• William Duncan Baxter
• William Duncan Connor
• William Duncan Herridge
• William Duncan MacMillan
• William Henry Duncan
• William Jolly Duncan
• William Wallace Duncan
• William fitz Duncan