Starlin DeJesus Castro (born March 24, 1990) is a Dominican professional baseball second baseman for the New York Yankees of Major League Baseball (MLB). He previously played for the Chicago Cubs. Castro is a three-time MLB All-Star and holds the record for most runs batted in in an MLB debut. In 2011, he led the National League in hits, becoming the youngest player to do so. He is listed at 6 foot 2 inches (1.88 meters) and 230 lbs (104 kg).

In 2009, Castro was named to the Florida State League All-Star team, and won MVP honors, going 4-for-4 with an inside-the-park home run in the game. He was also named All-Star Futures Game for the World Team. After the season, Castro was named the best prospect in Chicago's organization by Baseball America.

Castro was called up to the majors on May 7, 2010, from the Tennessee Smokies, the Cubs Double-A affiliate. He became the first major league player born in the 1990s.

In his first major league at-bat, he hit a home run off of Homer Bailey of the Cincinnati Reds. He became the sixth player in Cubs history and 106th player overall to do so. Later in the game he hit a triple with the bases loaded, setting the record for most runs batted in (RBIs) in a major league debut with six. He finished the game two for five in the Cubs' 14 to 7 win. Castro finished the season with a .300/.347/.408 line with three home runs and 41 RBIs in 463 at-bats over 125 games. Despite his significant offensive contribution, Castro led the team and was second in the National League in errors with 27.

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