Rubén Angel Sierra García (born October 6, 1965) is a Puerto Rican former Major League Baseball (MLB) outfielder.

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 graduated from Liceo Interamericano Castro High School in Puerto Rico in 1983, where he played baseball, basketball and volleyball.

[7] After helping the Yankees reach the playoffs for the first time in 14 years in 1995, Sierra was traded to the Detroit Tigers with Matt Drews for Cecil Fielder.

However, he was the final out of Game 7 of the 2004 American League Championship Series, hitting a ground ball to Pokey Reese, which secured the dramatic comeback victory of the Boston Red Sox.