Juan Carlos Romero (born June 4, 1976) is a Puerto Rican former professional baseball pitcher.

Romero improved a weak Phillies' bullpen plagued by inconsistency and injuries, which posted a 3.17 ERA in the final stretch of September.

He also played a crucial role in the Phillies' triumph on the last day of the season, when in a 6–1 victory over the Washington Nationals that capped the team's comeback against the New York Mets, Romero pitched one inning and struck out two.

On October 29, 2008, Romero was the winning pitcher in Game 5 of the 2008 World Series, which clinched the first major championship in the city of Philadelphia in 25-years.

[6] Prior to the 2009 season, Romero was suspended 50-games for testing positive for androstenedione, a performance-enhancing drug banned by MLB.

[11] He made 11 appearances for the Triple-A Scranton/Wilkes-Barre Yankees, facing 55 batter, striking out 10, and allowing four earned runs.

On July 21, 2012, Romero signed a minor league contract with the Cleveland Indians, and was assigned to the Triple-A Columbus Clippers.

[16] On March 22, 2013, Romero signed a minor league contract with a invitation to spring training with the Washington Nationals.