Matthew Bruce Mantei [MAN-tie] (born July 7, 1973) is an American former Major League Baseball relief pitcher.

In his career, Mantei played with the Florida Marlins, Arizona Diamondbacks and Boston Red Sox.

[9] Mantei threw a bullpen session for the Detroit Tigers on January 11, 2008 and signed a minor league contract with them.

[11] In a ten-year career with Florida, Arizona, and Boston, Mantei owned a 14–18 record with a 4.07 ERA and 93 saves in 322.7 innings.

On March 4, 2014, Mantei and his family appeared on the History Channel program Counting Cars, commissioning a custom-restored 1953 Chevy truck.