Antônio Carlos Gueiros Ribeiro known as Badalhoca (born October 5, 1957) is a Brazilian former volleyball player who competed in the 1980 Summer Olympics and in the 1984 Summer Olympics. In 1980 he was part of the Brazilian team which finished fifth in the Olympic tournament. He played two matches. Four years later he won the silver medal with the Brazilian team in the 1984 Olympic tournament. He played five matches.