Jacinto S. Cayco (born 1924/1925) is a retired Filipino swimmer and referee who has competed in the 1948 Summer Olympics. He also had a brother named, Pedro who has competed in the 1956 Summer Olympics. Cayco won two gold medals at the 1951 Asian Games; one at the 200 meters breaststroke event and the other was won with Nurhatab Rajab and Artemio Salamat at the 3x100 medley relay. At the 1954 Asian Games he was captain of the swimming team. At the 1958 Asian Games he won a silver medal at the 4x100 medley relay with three other swimmers.