Oswaldo José Guillén Barrios is a Venezuelan former professional baseball player and current manager of the Tigres de Aragua of the Venezuelan League. He played in Major League Baseball as a shortstop from 1985 to 2000, most prominently as a member of the Chicago White Sox where he won the American League Rookie of the Year Award as well as a Gold Glove Award. A three-time All-Star player, Guillén was considered one of the best defensive shortstops of his era. He later managed the Chicago White Sox from 2004 to 2011, winning the World Series in 2005 and then moving to the Miami Marlins in 2012.
As a player, Guillén was known for his passion, speed, hustle, intensity, defensive abilities and his ebullient love for the game.