The Estádio Plácido Aderaldo Castelo, also known as the Castelão, is a football stadium that was inaugurated on November 11, 1973 in Fortaleza, Ceará, Brazil, with a maximum capacity of 67,037 people.

The stadium is owned by the Ceará state Government, and is the home ground of Ceará Sporting Club and Fortaleza Esporte Clube. Its formal name honors Plácido Aderaldo Castelo, who served as the Governor of Ceará from September 12, 1966 to March 15, 1971, and was a leader in getting the stadium built.

Castelão is one of the venues of the 2014 FIFA World Cup, which will be held in Brazil. The stadium was redeveloped for the tournament; the reconstruction project involved the addition of a larger roof, the construction of an underground car park with 4,200 spaces, and a new lower tier. After the redevelopment, the stadium now has an all-seater capacity of 67,037.