Below is a list of professional football championship games in the United States, involving: * the informal Pittsburgh circuit of professional football teams (1890s to 1901); * the 1902 "National" Football League and the World Series of Professional Football (WSF, 1902-1903); * the Ohio Independent Championship (OIC, 1903-1919); * the New York Pro Football League (NYPFL, 1916-1919); * the American Professional Football Association and the National Football League (NFL, 1920-present); * the All-America Football Conference (AAFC, 1946-1949); * the American Football League (AFL, 1960-1969); * the World Football League (WFL, 1974-1975); * the United States Football League (USFL, 1983-85); * the XFL (2001); * the United Football League (2009-present);