The first Negro National League (NNL) was one of the several Negro leagues that were established during the period in the United States when organized baseball was segregated. The league was formed in 1920 with former player Rube Foster as its president.

The Negro leagues were United States professional baseball leagues comprising teams of African Americans. The term may be used broadly to include professional black teams outside the leagues and it may be used narrowly for the seven relatively successful leagues beginning in 1920 that are sometimes termed "Negro Major Leagues".