| Daniel Duncan | |
| State: | Ohio |
| District: | 10th |
| Term Start: | March 4, 1847 |
| Term End: | March 3, 1849 |
| Preceded: | Columbus Delano |
| Succeeded: | Charles Sweetser |
| State House2: | Ohio |
| District2: | Licking County |
| Term Start2: | December 4, 1843 |
| Term End2: | December 1, 1844 |
| Preceded2: | Isaac Green Phelps Humphreys |
| Succeeded2: | P. N. O'Bannon |
| Alongside2: | Samuel White |
| Party: | Whig |
| Birth Date: | 22 July 1806 |
| Birth Place: | Shippensburg, Pennsylvania |
| Death Place: | Washington, D.C. |
| Restingplace: | Newark Graveyard |
| Alma Mater: | Jefferson College |
| Signature: | Daniel Duncan (Ohio politician) signature.jpg |
Daniel Duncan (July 22, 1806 – May 18, 1849) was a U.S. Representative from Ohio.
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.