Michael John Sweeney (born July 22, 1973) is a former Major League Baseball designated hitter and first baseman. Sweeney played his first 13 seasons in the majors with the Kansas City Royals, first as a catcher, then at first base and designated hitter. Sweeney also played for the Oakland Athletics, Seattle Mariners, and Philadelphia Phillies. On March 25, 2011, Sweeney retired from baseball. He now works as a special assistant for the Kansas City Royals. Sweeney was inducted into the Kansas City Royals Hall of Fame on August 15, 2015.