Charles Duncan may refer to:
Politics and law Charles T. Duncan (1838–1915), American lawyer and Virginia state judge Charles Duncan (politician) (1865–1933), British politician and trade unionist Charles Duncan Jr. (1926–2022), U.S. Secretary of Energy under President Jimmy Carter
Others Charles Duncan (captain) ( 1786–1789), British ship captain and maritime fur trader Charles Duncan (stonemason) (1823–1891), Scottish-born Utah stonemason Charles Duncan (artist) (1887–1970), American avant-garde painter Charlie Duncan (1889–?), Scottish footballer Charles Stafford Duncan (1892–1952), American painter Charles K. Duncan (1911–1994), United States Navy admiral Charles "Scottie" Duncan (fl. 1937–1940), American baseball player Charles Duncan (British Army soldier) (1920–1943), British soldier posthumously awarded the George Cross