|Full name||Pinheiro Atlético Clube|
|Nickname(s)||Búfalo da Baixada|
|Founded||1 April 1989|
|Ground||Estádio Municipal Costa Rodrigues|
|Head coach||João Carlos Ângelo|
Founded on 1 April 1989, Pinheiro played in the 1990, 1991, 1992 and 1993 editions of Campeonato Maranhense before going into inactivity. The club returned to an active status only in 2016, playing in the Maranhense Segunda Divisão, where they lost the title and the promotion to Americano.
After finishing in the last position in the 2017 second division, Pinheiro won promotion as champions in 2018, finishing the tournament undefeated. The club remained in the first division in the following years, after finishing fifth and six in 2019 and 2020, respectively.
- "Pinheiro Atlético Clube se despede desta temporada de jogos com foto oficial e encontro com a torcida" [Pinheiro Atlético Clube bid farewell from matches this season with an official picture and meeting with the supporters] (in Brazilian Portuguese). Pinheiro. 13 May 2021. Retrieved 19 October 2021.
- "Pinheiro é campeão invícto da Série B do Maranhense 2018" [Pinheiro is the undefeated champion of the 2018 Maranhense Série B] (in Brazilian Portuguese). G7. 4 November 2018. Retrieved 19 October 2021.