Shawn Michael O'Malley (born December 28, 1987) is an American former professional baseball utility player.

O'Malley helped lead Southridge High School to the 2003-2004 Washington State 4A Baseball Title.

He made his major league debut on September 7, 2014, when he pinch-hit for Albert Pujols at Minnesota against Twins pitcher Ryan Pressly, reaching on an infield hit to shortstop which drove in a run.

While batting .345 at Triple-A with the Tacoma Rainiers, he was hindered from getting promoted due to a wrist injury, until rosters expanded.

Despite a very successful Spring Training, batting .471 (16-for-34) in 21 games, O'Malley was optioned to Triple-A Tacoma to begin the 2016 season.

[4] On June 2, 2016, O'Malley played a vital role in the Mariners biggest comeback in club history.