José Ariel Contreras Camejo (born December 6, 1971 in Las Martinas, Pinar del Río, Cuba) is a right-handed Major League Baseball pitcher who is currently with the Philadelphia Phillies. He previously played for the New York Yankees (2003–04), the Chicago White Sox (2004–09), the Colorado Rockies (2009), and the Philadelphia Phillies (2010), as well as the Cuban national team.
In addition to his time with the Cuban national team, Contreras pitched for the Pinar del Río Vegueros of Cuba's Cuban National Series. In his last season in Cuba (2001–2002), he went 13–4 with a 1.76 ERA and 149 strikeouts. Contreras was named Cuban Athlete of the Year on three separate occasions.
In March 1999 José Contreras pitched for the Cuban national team against the Baltimore Orioles in front of his countrymen at Estadio Latinoamericano in Havana. Contreras pitched eight shutout innings and struck out ten. It was then that Major League scouts took notice of the Cuban pitcher.