Thomas Collier Platt (July 15, 1833 – March 6, 1910) was a two-term member of the U.S. House of Representatives (1873–1877) and a three-term U.S. Senator from New York in 1881 and 1897 to 1909. He is best known as the "political boss" of the Republican Party in New York State in the late 19th century and early 20th century. Upon his death, the "New York Times" stated that "no man ever exercised less influence in the Senate or the House of Representatives than he," but "no man ever exercised more power as a political leader." He considered himself the "political godfather" of many Republican governors of the state, including Theodore Roosevelt.