José Ariel Contreras Camejo (born December 6, 1971), is a Cuban former professional baseball pitcher, who played in the Cuban National Series (CNS), Major League Baseball (MLB), and internationally for the Cuban national baseball team. Contreras played for Pinar del Río Vegueros of the CNS, and competed for the Cuban national team in the Summer Olympics, the Pan American Games, the Baseball World Cup, and the 1999 exhibition series against the Baltimore Orioles. Recognized as the best Cuban baseball player, Contreras defected from Cuba in 2002.