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

See also

• All pages with titles containing Daniel Duncan
• All pages with titles containing Danny Duncan