National Colored Base Ball League ended in 1887.
National Socialist League ended in 1939.
National League for Democracy ended in 2010.
English National League ended in 1954.
National League Party ended in 1931.
National Rookie League ended in 2002.
National Security League ended in 1942.
National Socialist Schoolchildren's League ended in 1933.
National Indoor Football League ended in 2008.
National-Christian Defense League ended in 1935.
National Socialist Teachers League ended in 1943.
Ladies League Baseball ended in 1998.
Continental Baseball League ended in 2010.