Comercial Atlético Clube, commonly known as Comercial, is a Brazilian football club based in Campo Maior, Piauí state. They will compete in the 2011 Copa do Brasil.
The club was founded on April 21, 1945. Comercial won the Campeonato Piauiense Second Level in 2004, the Campeonato Piauiense in 2010, and they competed in the Copa do Brasil in 2011.
Comercial Atlético Clube play their home games at Estádio Deusdeth de Melo. The stadium has a maximum capacity of 4,000 people.