Jim is an American former baseball player. He played for five teams in an 11-year career, and retired from the Florida Marlins in 2005. He was a right-handed pitcher.

Mecir is notable for having overcome a birth defect (namely club feet) to become an effective Major League pitcher as well as for regularly throwing a screwball. He spent 4½ years as a member of the Oakland Athletics and is prominently mentioned in Michael Lewis's bestselling book Moneyball: The Art of Winning an Unfair Game.

Mecir attended Eckerd College, and in 1990 he played collegiate summer baseball with the Falmouth Commodores of the Cape Cod Baseball League.^[1] He was selected by the Seattle Mariners in the third round of the 1991 amateur draft. He played for Seattle in 1995, the New York Yankees in 1996^[2] and 1997, the Tampa Bay Devil Rays from 1998 to 2000, the Oakland Athletics from 2001 to 2004, before spending the last year of his career with the Marlins. He announced his retirement on October 2, 2005, following the Marlins' last game of the season.

Mecir was inducted into the Suffolk Sports Hall of Fame on Long Island, New York, in the Baseball Category with the Class of 2011.