Jacinto S. Cayco (1924/5 – 17 February 2021) was a Filipino swimmer and referee who competed in the 1948 Summer Olympics.

[2] 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 1958 Asian Games he won a silver medal at the 4x100 medley relay with three other swimmers.

[4] He was also a varsity player of the University of Santo Tomas swimming team from 1946 to 1953.

[4] Cayco was named into the Philippine Sports Hall of Fame on 25 January 2016.