David Wilmot (January 20, 1814 – March 16, 1868) was an American politician and judge. He served as Representative and a Senator for Pennsylvania and as a judge of the Court of Claims. He is best known for being the prime sponsor and eponym of the Wilmot Proviso, a failed proposal to ban the expansion of slavery to western lands gained in the Mexican Cession. A notable member of the anti-slavery Free Soil Party, Wilmot later was instrumental in establishing the Republican Party in Pennsylvania.