Cyrus Livingston Dunham (January 16, 1817 – November 21, 1877) was an attorney, soldier, and prominent Indiana politician, serving most notably as a U.S. Representative from Indiana from 1849 to 1855.
Born in Dryden, New York in 1817, Dunham attended public schools, and eventually taught school. After earning a law degree and being admitted to the Bar, he moved to Salem, Indiana in 1841 and began practicing law. Dunham was elected prosecuting attorney of Washington County, Indiana in 1845 and then served as a member of the Indiana State House of Representatives for one term from 1846 to 1847.
Cyrus Livingston Dunham then successfully ran for Congress, being elected to the Thirty-first, Thirty-second, and Thirty-third Congresses (March 4, 1849 – March 3, 1855) as a Democrat. He served as Chairman of the Committee on Roads and Canals during the Thirty-third Congress. After his time in Congress, he was appointed by Governor Ashbel P. Willard as Secretary of State of Indiana, serving from 1859 to 1860.
During the American Civil War, Dunham served in the Union Army as Colonel of the Fiftieth Regiment, Company S, Indiana Volunteer Infantry. He was commissioned on December 1, 1861 and honorably discharged on November 4, 1863.