David Diehl is a former professional offensive lineman who played in the NFL. He played college football for the University of Illinois. The Giants selected him in the fifth round of the 2003 NFL Draft.
Diehl played his entire career with the New York Giants. He was the Giants starting left tackle on two Super Bowl championship teams, beating the New England Patriots in both games.In his rookie season, Diehl started all 16 games, becoming the first Giants rookie to do so since Mark Bavaro in 1985. He was the only rookie to start at the same position each game during the 2003 season. The Giants signed Diehl to a six-year, $31 million contract in May 2008. At the end of the 2009 season, Diehl was elected to the 2010 Pro Bowl as a Super Bowl Participant replacement. Diehl had started every game of his NFL career until 2010, when he tore his hamstring and suffered a partially dislocated hip. On January 24, 2014, Diehl announced his retirement.
On August 6, 2014, it was announced Diehl had been hired to work as a color analyst for NFL games on Fox. He teamed with Thom Brennaman as the number #4 team on these telecasts for 2014. In 2017, Diehl joined CBS Sports Network as an college football analyst.