John Clyde Grass (born February 29, 1968) is an American football coach.
He previously coached high school football in the state of Alabama for over two decades.
Grass' third season as head coach finished during the second round of the FCS Playoffs, where they were upset by the Youngstown St. Penguins 40–24 at home.
Grass resigned as head coach at Jacksonville State on November 8, 2021 with two regular season games left to play.
The following month, it was announced that Grass was hired by Clemson in an off-field analyst role.