Kelly Michael Gregg (born November 1, 1976) is an American football nose tackle in the National Football League who is currently a free agent. He was drafted by the Cincinnati Bengals in the sixth round of the 1999 NFL Draft. He played college football at Oklahoma. Gregg earned a Super Bowl ring as a member of the Baltimore Ravens practice squad in Super Bowl XXXV. He played with the Ravens through the 2010 season. Gregg spent time in his early career with the Cincinnati Bengals and Philadelphia Eagles, and was a starter for the Kansas City Chiefs in 2011.