Garrett Andrew Olson (born October 18, 1983) is an American former professional baseball pitcher.

[1] In 2005 with the Mustangs, he was an All-Big West Conference First Team starting pitcher honors recipient.

[3] In 2006, he advanced to the Double-A Bowie Baysox,[3] and was named the Baltimore Orioles Minor League Player of the Year.

Olson was promoted from the Triple-A Norfolk Tides to take the place of injured Orioles starter Steve Trachsel, and he made his major league debut on Independence Day of 2007 against the Chicago White Sox.

On September 1, 2007, Olson made a start at Fenway Park against the Boston Red Sox, where he was the opposing pitcher in Clay Buchholz's no-hitter.

[6] On June 28, 2008, Olson earned his first career hit vs. the Washington Nationals against Jesús Colomé in the sixth inning.

[13] Olson was again optioned to Triple-A Tacoma on August 20 to clear roster space for Infielder Bill Hall.

With Tacoma, Olson went 2–3 with a 4.94 ERA and notched the Rainiers' only playoff win against the Sacramento River Cats.

[18] Olson made his Mets debut on August 8, pitching one third of an inning, giving up four earned runs against the Miami Marlins.

[19] Olson was designated for assignment on August 11 to create room on the roster for Johan Santana.