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Major | - National Football League (1920–present)
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Other | |
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Defunct national | - American Football League (1926)²
- American Football League (1936–1937)²
- American Football League (1940–1941)
- All-America Football Conference² (1945–1949)
- American Football League (1960–1969)¹
- Continental Football League (1965–1969)
- World Football League (1974–1975)
- United States Football League (1983–1985)
- World League of American Football/NFL Europe/NFL Europa³
- XFL (2001)
- United Football League (2009–2012)
- Alliance of American Football (2019)
- XFL (2020, 2023)*
- United States Football League (2022–2023)*
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Defunct regional | |
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Major | |
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Predecessors | - Direct
- Interprovincial Rugby Football Union
- Western Interprovincial Football Union
- Other
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Junior | |
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