The football (soccer) Campeonato Brasileiro Série B 2003, the second level of Brazilian National League, was played from April 25 to November 29, 2003.
The eight best ranked teams advanced to the second round, where they were divided in two groups of four.
Those four teams were put in a single group, and played against each other home and away.
Palmeiras finished the final phase group with most points and was declared 2003 Brazilian Série B champions, claiming the promotion to the 2004 Série A along with Botafogo, the runners-up.
The two worst ranked teams in the first round (Gama and União São João) were relegated to play Série C in 2004.