The Nationale 1 Masculin (abbreviated as NM1; in English: National 1 Men) is the highest professional basketball league in Senegal. Established in 1971, the league consists of 16 teams.
Each season is finished with a final in a single-game elimination format, held at the Marius Ndiaye Stadium in Dakar. AS Douanes is the most successful team in NM1 history with 11 won titles.
The champions of the NM1 qualify directly for the regular season of the Basketball Africa League (BAL), the premiere continental league. The bottom two teams are relegated to the second division Nationale 2.