Matthew Edward Diaz (/ˈdaɪ.æz/ DEYE-az;[1] born March 3, 1978) is an American former professional baseball outfielder.

He played in Major League Baseball for the Tampa Bay Devil Rays, Kansas City Royals, Atlanta Braves, Pittsburgh Pirates and Miami Marlins.

Appearing in 124 games, including many starting assignments in the second half of the season, Diaz batted .327 in 297 at-bats.

On December 26, 2012, Diaz signed a minor-league contract with the New York Yankees with an invitation to Spring Training.

A born-again Christian, Diaz and his wife Leslee have three kids, Nathan Everett, Anna Grace, and Matthew Jacob.

Matt is the second oldest of four brothers: Zachary, contemporary Christian singer Jonny Diaz, and Benjamin.