Luis Ernesto Aparicio Montiel, nicknamed "Little Louie", is a Venezuelan former professional baseball player. He played in Major League Baseball (MLB) as a shortstop from 1956 to 1973 for three American League (AL) teams, most prominently the Chicago White Sox. During his ten seasons with the team, he became known for his exceptional defensive and base stealing skills. A 13-time All-Star,, he made an immediate impact with the team, winning the Rookie of the Year Award in 1956 after leading the league in stolen bases and leading AL shortstops in putouts and assists; he was the first Latin American player to win the award.

Shortstop, abbreviated SS, is the baseball or softball fielding position between second and third base, which is considered to be among the most demanding defensive positions. Historically, the position was assigned to defensive specialists who were typically poor at batting and were often placed at the bottom of the batting order. Today, shortstops are often able to hit well and many are placed at the top of the lineup. In the numbering system used by scorers to record defensive plays, the shortstop is assigned the number 6.