Daniel Duncan may refer to: Daniel Duncan (physician) (1649–1735), Scottish-French doctor and chemist Daniel Duncan (Ohio politician) (1806–1849), congressman from the US state of Ohio Daniel Duncan McKenzie (1859–1927), parliamentarian and jurist from the Canadian province of Nova Scotia Daniel Kablan Duncan (born 1943), foreign minister of Côte d'Ivoire Dan Duncan (1933–2010), American co-founder, chairman and majority shareholder of Enterprise Products Danny Duncan (musician) (born 1986), musician with We the Kings