Adrian William Klemm (born May 21, 1977 in Inglewood, California) is a former National Football League offensive lineman, who played for the New England Patriots and Green Bay Packers. He is the current run game coordinator and offensive line coach at UCLA. Klemm previously served as the offensive line coach for four seasons at Southern Methodist University, and accepted a position on Jim L. Mora's staff at UCLA on December 15, 2011. He is perhaps best known for being drafted by the New England Patriots in the second round of the 2000 NFL Draft, the same draft in which they selected Tom Brady in the sixth round. Klemm spent seven seasons in the NFL, winning three Super Bowls as a member of the Patriots.

Klemm attended Saint Monica Catholic High School in Santa Monica, California, and was a prep teammate of Marcellus Wiley and was named the Santa Monica athlete of the year as a senior. Klemm was a two-time All-League selection in both football and basketball.

Klemm attended the University of Hawaii and was a four-year starter.