David Diehl is a former offensive lineman who played his entire career with the New York Giants of the National Football League (NFL). He was the Giants starting left guard on two Super Bowl championship teams, beating the New England Patriots in both games. He played college football for the University of Illinois. Diehl was selected in the fifth round of the 2003 NFL Draft and retired after the 2013 season. He made the 2009 Pro Bowl.

Diehl is currently a color analyst for NFL games on FOX Sports and for college games on CBS.