Matthew Aaron Treanor (born March 3, 1976, in Garden Grove, California) is an American Major League Baseball catcher for the Kansas City Royals.
Treanor attended Mater Dei High School in Santa Ana, California and was a standout baseball player. As a senior, he was a second-team All-America pick and was named to the all-tournament team at the Upper Deck high school baseball tournament.
Drafted by the Kansas City Royals as a high school player in 1994 and traded to the Florida Marlins in 1997, Treanor spent 10 years in the minor leagues—7 in Single-A—before finally making his major league debut on June 2, 2004 against the Cincinnati Reds when he went 1 for 3 with a run scored. In the highlight of his season, Treanor recorded his first RBI on a walk-off single against the Chicago White Sox on June 17.