Christopher St. John "Sinjin" Smith (born May 7, 1957, in Santa Monica, California) is a professional beach volleyball player. He won one U.S. championship and two World championships with Randy Stoklos. The pair of Smith and Stoklos was featured in the video game Kings of the Beach released in 1988 for multiple computer platforms by Electronic Arts and in 1990 for the Nintendo Entertainment System by Konami, and also appeared in the 1990 film Side Out as the nemesis team of Rollo Vincent (Stoklos) and Billy Cross (Smith).