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Major: National Football League
Minor: United National Gridiron League
Semi-pro: Central Football League • Empire Football League • Mid Continental Football League • Mid Ohio Football League • Minor League Football Alliance • Minor League Football Association • New England Football League • North American Football League • Northeastern Football Alliance • Southern States Football League • Texas/Louisiana Southern Football Association • United States Football Alliance
Women's: Women's Professional Football League • National Women's Football Association • Independent Women's Football League • Women's Football League
Defunct major: All-America Football Conference • American Football League (1926) • American Football League (1936-1937) • American Football League (1940-1941) • American Football League (1960-1969) • United States Football League • World Football League • XFL
Defunct minor/semi-pro: American Association (1936-1941)/American Football League (1946-1950) • American Football League (1934) • American Football League (1938-1939) • American Football League (1944) • Atlantic Coast Football League • Continental Football League • Dixie League • Pacific Coast Professional Football League • Hawaii Football League • NFL Europa • Regional Football League • Spring Football League • United Football League
Folded or merged before any games were played: Professional Spring Football League
Planned: All American Football League (Spring 2009) • United Football League (Fall 2009) • The New USFL (2010)
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