John Gregory Clay (born May 1, 1964) is a former American college and professional football player who was an offensive tackle in the National Football League (NFL) for two seasons during the late 1980s. Clay played college football for the University of Missouri, and thereafter, played professionally for the Los Angeles Raiders and the San Diego Chargers of the NFL. Clay was born in St. Louis, Missouri. He was drafted by the Los Angeles Raiders in the first round (15th pick overall) of the 1987 NFL Draft.