Carlos Monasterios Hernandez (born March 21, 1986 in Miranda, Venezuela) is a right-handed pitcher for the Los Angeles Dodgers.
He was originally signed as a non-drafted free agent by the New York Yankees in 2006 but was shortly traded to the Philadelphia Phillies (along with Matt Smith and C. J. Henry) for Bobby Abreu and Cory Lidle.
With the Clearwater Threshers in 2009 he was selected to the Florida State League mid-season All-Star team.
Monasterios was selected by the New York Mets in the Rule V Draft after the 2009 season and promptly traded to the Los Angeles Dodgers, who added him to their 25 man roster.
He made his Major League debut on April 5, 2010 against the Pittsburgh Pirates, working a scoreless inning of relief. His first career victory came in a 13 inning game against the Washington Nationals on April 24. His first Major League start was on May 1, 2010 against the Pittsburgh Pirates, allowing one run in four innings of work. He remained on the Dodgers major league roster all season, appearing in 32 games and making 13 starts. For the season, he pitched 88.1 innings with a record of 3-5, a 4.38 ERA and 52 strikeouts.
He was assigned to the AAA Albuquerque Isotopes to start the 2011 season. However, he only made one start for the Isotopes, pitching 4 innings and allowing 6 runs. He was placed on the disabled list after that start with elbow inflamation and on July 15, he underwent Tommy John Surgery, shutting him down for the season.