Guillermo Quiroz is a former Venezuelan professional baseball player who played as a catcher in Major League Baseball (MLB) for several teams. Quiroz began his professional baseball career in 1998 when he was signed by the Toronto Blue Jays as an amateur free agent. He spent several years in the minor leagues before making his MLB debut with the Blue Jays in 2004.

Quiroz played for the Blue Jays for two seasons before being traded to the Seattle Mariners in 2006. He played for the Mariners for one season before being traded to the Texas Rangers in 2007. Quiroz played for the Rangers for two seasons before being traded to the Baltimore Orioles in 2009.

Quiroz played for the Orioles for one season before being released and signing with the Seattle Mariners in 2010. He played for the Mariners for one season before being released and signing with the San Francisco Giants in 2011. Quiroz played for the Giants for one season before being released and signing with the Seattle Mariners in 2012.

Quiroz played for the Mariners for one season before being released and signing with the Boston Red Sox in 2013. He played for the Red Sox for one season before being released and signing with the San Francisco Giants in 2014. Quiroz played for the Giants for one season before becoming a free agent.

Throughout his career, Quiroz was known for his strong defensive skills as a catcher. He was also a solid hitter, with a career batting average of .199 and 8 home runs. Despite never becoming a star player, Quiroz was respected by his teammates and coaches for his work ethic and dedication to the game.

After his playing career ended, Quiroz became a coach in the minor leagues. He currently serves as the manager of the Venezuelan national baseball team. Quiroz's career serves as a reminder that even players who don't achieve superstar status can still have successful and fulfilling careers in professional sports.