Daniel Duncan, Dan Duncan, or Danny Duncan may refer to:Daniel Duncan (physician) (1649–1735), Scottish-French doctor and chemist Daniel Duncan (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, foreign minister of Côte d'Ivoire Dan Duncan (1933–2010), American co-founder, chairman and majority shareholder of Enterprise Products Danny Duncan (musician), musician with We the Kings Danny Duncan (YouTuber), prank and comedy YouTuber