Campeonato Brasileiro Série B

The Campeonato Brasileiro Série B (commonly referred to as the Brasileirão Série B, the Série B or the Brazilian Série B to distinguish it from Italy's Serie B), and currently officially called Brasileirão Série B Superbet for sponsorship reasons) is the second tier of the Brazilian football league system, which is organized by the Brazilian Football Confederation.

The competition was played for the first time in 1971, and for a long time, the competition format was inconsistent, with changes happening frequently. Also, there were years where the competition was not played at all.

Since 2006 it has been contested by 20 teams in a double round-robin format with 38 matches. From 2006 to 2025, the top four teams each season were promoted to the Campeonato Brasileiro Série A group and the bottom four teams were relegated to the Campeonato Brasileiro Série C. Beginning in 2026 a promotion playoff system was implemented where the top two teams receive automatic promotion, the third place team plays the sixth place team for a promotion spot, and the fourth place team plays the fifth place team for a promotion spot.