The 2021 Campeonato Brasileiro Série D was a football competition held in Brazil, equivalent to the fourth division.
Sixty-four teams qualified from their state leagues and cups, and four relegated from the 2020 Campeonato Brasileiro Série C (Boa Esporte, Imperatriz, São Bento and Treze).
[2] The match Imperatriz v 4 de Julho, played at the Estádio Frei Epifânio D'Abadia (Imperatriz) on 28 August 2021 (Group A2 13th round), was finished in the 76th minute (0–0) after a strong storm caused the partial collapse of the grandstand roof located over the press booths and changing rooms of the teams and referees.
[3] ABC, Aparecidense, Atlético Cearense and Campinense qualified for the semi-finals and were promoted to the 2022 Campeonato Brasileiro Série C.[4] In the finals, Aparecidense defeated Campinense 2–1 on aggregate to win their first title.
[1] The lowest-seeded teams from the eight worst ranked federations in the 2021 CBF ranking (Piauí, Distrito Federal, Espírito Santo, Mato Grosso do Sul, Rondônia, Roraima, Tocantins and Amapá) competed to decide four places in the group stage.
If tied on aggregate, the away goals rule would not be used, extra time would not be played, and the penalty shoot-out would be used to determine the winners (Regulations Article 18).
If tied on aggregate, the away goals rule would not be used, extra time would not be played, and the penalty shoot-out would be used to determine the winners (Regulations Article 18).
For the quarter-finals, teams were seeded based on the table of results of all matches in the competition.
The four quarter-finals winners were promoted to 2022 Série C.[12] The round of 32 was a two-legged knockout tie, with the draw regionalised.