Daniel Duncan (July 22, 1806 – May 18, 1849) was a U.S. Representative from Ohio.

Daniel Duncan
Member of the U.S. House of Representatives from Ohio's 10th district
In office March 4, 1847 – March 3, 1849
Preceded by	Columbus Delano
Succeeded by	Charles Sweetser
Member of the Ohio House of Representatives from the Licking County district
In office December 4, 1843 – December 1, 1844 Serving with Samuel White
Preceded by	Isaac Green Phelps Humphreys
Succeeded by	P. N. O'Bannon
Personal details
Born	(1806-07-22)July 22, 1806 Shippensburg, Pennsylvania
Died	May 18, 1849(1849-05-18) (aged 42) Washington, D.C.
Resting place	Newark Graveyard
Political party	Whig
Alma mater	Jefferson College
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Born in Shippensburg, Pennsylvania, Duncan completed preparatory studies. He attended Jefferson College, Canonsburg, Pennsylvania, in 1825. He moved to Newark, Ohio, in 1828. He engaged in mercantile pursuits. He served as member of the State house of representatives in 1843. He was an unsuccessful Whig candidate for election to the State senate in 1844.

Duncan was elected as a Whig to the Thirtieth Congress (March 4, 1847 – March 3, 1849). He was an unsuccessful candidate for reelection in 1848 to the Thirty-first Congress. He died in Washington, D.C., on May 18, 1849. He was interred in the Newark Graveyard, Newark, Ohio.