João Castelo Ribeiro Gonçalves (October 19, 1937 – December 11, 2016) was a Brazilian politician and lawyer who was Governor of Maranhão, Brazil from March 15, 1979, to May 15, 1982.

A registered administrative technician at the Federal Council, he was assistant to the Cabinet of Mayor Carlos Vasconcelos in São Luís until he became an employee of the Banco da Amazônia in 1956, eventually occupying one of his boards before joining politics.

He also held the following functions: State Treasurer of Maranhão, Member of Working Group for Data Processing and Technical Standards of the Ministry of the Interior and of the Banking Advisory Committee of the National Monetary Council.

Received the title of "Doctor Honoris Causa" of the Federal University of Maranhão and in 1984 graduated in Law from the Unified School of Brasília.

On April 17, 2016, she voted in favor of opening the Impeachment Process of Dilma Rousseff in the plenary of the Chamber of Deputies of Brazil.