Rubén Angel Sierra García (born October 6, 1965) is a former Major League Baseball outfielder. Sierra goes by the nicknames El Caballo and El Indio. Over 20 seasons, Sierra played for the Texas Rangers (1986–92, 2000–01, 2003), Oakland Athletics (1992–95), New York Yankees (1995–96, 2003–05), Detroit Tigers (1996), Cincinnati Reds (1997), Toronto Blue Jays (1997), Chicago White Sox (1998), Seattle Mariners (2002) and Minnesota Twins (2006). Sierra also signed with the Cleveland Indians at the end of 1999, but was released towards the end of spring training in March 2000.