Campeonato Nacional Basquetebol

1st Division National Championship
Note: From the 2003–04 season onwards it continued as Proliga (Portuguese second division).

Campeonato Nacional Basquetebol - CNB
The National Championship of the 1st Division is the third level of basketball in Portugal. Competition organized by the Portuguese Basketball Federation. It began to be played every year from the 1932–33 season to 1994–95 (as the First Tier), from 1995–96 to 2002–03 (as the Second Tier), having been replaced by the Proliga in 2003–04.

The 1st and 2nd divisions of the Campeonato Nacional Basquetebol - CNB are, respectively, the third and fourth basketball leagues in Portugal. They league were created in 2003.