The Campeonato Brasileiro Série D (English: Brazilian Championship Serie D), commonly known as the Série D or the Brazilian Série D to distinguish it from the Italian Serie D, is the fourth division of the Brazilian football league system, and was announced by the Brazilian Football Confederation (CBF) on 9 April 2008. The Campeonato Brasileiro Série D was formed from the split of the Série C, keeping its best 20 clubs and playing double round robin as does the top three divisions. The Série D keeps the same format of the older Série C, but with participation limited to 40 clubs recognized by the state federation. In 2016 the Série D was expanded to 68 clubs, but in 2022 it was reduced to 64 clubs.

The Série D format is a mixed system: the 64 clubs are divided in 8 groups organized regionally, playing in a round-robin format. The top teams qualify for playoffs and clubs that reach the semi-finals are promoted to Série C. Clubs qualify for the Série D by their performance at state championships — spots are given to the top clubs on those leagues that aren't at Série A, B or C — at state cups or relegation from Série C.

The Brazil Serie D is the fourth tier of professional football in Brazil, serving as a crucial stepping stone for clubs aspiring to reach higher levels of the national league system. Organized by the Brazilian Football Confederation (CBF), Serie D features teams from across the country competing in a structured tournament format that includes group stages, knockout rounds, and final matches. The competition provides a platform for emerging clubs to showcase their talent, gain national exposure, and earn promotion to the higher divisions—Serie C and eventually Serie B. Known for its passionate fan base and vibrant local rivalries, the Brazil Serie D embodies the spirit of grassroots football and serves as a vital pathway for clubs aiming to ascend the ranks of Brazilian professional soccer.