Allen Trimble (November 24, 1783 - February 3, 1870) was a Federalist politician from Ohio. He served as the 8th and 10th Governor of Ohio.

Born in Augusta County, Virginia to a Revolutionary War veteran. In 1804, Trimble moved outside of Hillsboro, Ohio. After briefly serving during the War of 1812, Trimble served in the Ohio House of Representatives from 1816-1817 and then in the Ohio State Senate from 1818-1826. Trimble became Speaker of the Senate, and it was in this capacity that he became governor from January-December 1822 when Governor Ethan A. Brown resigned to take a seat in the U.S. Senate. Trimble ran for re-election in 1822, but narrowly lost. He won election four years later, and then won a second full term in 1828. Trimble did not seek re-election in 1830. He then retired to farming, but did consent to accepting the nomination of the Know-Nothings in 1855.