Guillermo Martínez, Cuban javelin thrower
Guillermo Martínez López (born 28 June 1981 in Camagüey) is a Cuban javelin thrower.

In intercontinental competitions, he finished tenth at the 2005 World Championships and ninth at the 2007 World Championships. He also won the gold medal at the 2006 Central American and Caribbean Games and the gold medal at the 2007 Pan American Games

His personal best throw is 87.20 metres, achieved in October 2011 in Guadalajara.