** António Martins de Chaves ** (died 6 July 1447) was a Cardinal of the Catholic Church and bishop of Porto in Portugal. He was made cardinal on the 18 December 1439 by Pope Eugenius IV. He founded the church and hospice of San Antonio dei Portoghesi in 1440. He attended the Council of Basel as a representative of King Edward I of Portugal. Chaves was buried at the Archbasilica of St. John Lateran, where he was archpriest from 1444 to his death. His tomb was executed by Isaia da Pisa.