The 2018 Campeonato Brasileiro Série A (officially the Brasileirão Assaí 2018 for sponsorship reasons) was the 62nd season of the Campeonato Brasileiro Série A, the top level of professional football in Brazil, and the 15th edition in a double round-robin since its establishment in 2003.

The season began on 14 April 2018 and ended on 2 December 2018.

Twenty teams competed in the league – the top sixteen teams from the previous season, as well as four teams promoted from the Série B. América Mineiro became the first club to be promoted after a 1–2 win against Figueirense on 11 November 2017.

[3][4] The clubs can have a maximum of five foreign players in their Campeonato Brasileiro squads per match, but there is no limit of foreigners in the clubs' squads.

Ranked from highest to lowest average attendance.