Matthew Steven Mangini (born December 21, 1985) is an American former Major League Baseball infielder who played for the Seattle Mariners in 2010.

[5] Mangini started the 2011 season on the disabled list and was activated on April 21, but was immediately optioned to Triple-A.

[6] He was released on August 23, after leaving Triple-A Tacoma for an undisclosed personal issue.

[7] The Tampa Bay Rays signed Mangini to a minor league contract on December 6, 2011.

The Arizona Diamondbacks signed Mangini to a minor league contract on August 14, 2012.