Carlos Duarte Costa (July 21, 1888 – March 26, 1961) was a Brazilian Catholic bishop who became the founder of the Brazilian Catholic Apostolic Church, an Independent Catholic Church, and its international network, which long after his death became the short-lived Worldwide Communion of Catholic Apostolic National Churches.
The former Bishop of Botucatu, he was excommunicated by Pope Pius XII, ultimately for schism, but in culmination of several doctrinal and canonical issues (such as his views on clerical celibacy).
Duarte Costa has been canonized as "St.
Carlos of Brazil" by the Brazilian Catholic Apostolic Church.