John Thomas “J. T.” O’Sullivan is a former professional football quarterback from 2002 to 2012. He was drafted by the New Orleans Saints in the sixth round of the 2002 NFL Draft. He played college football at UC, Davis.

O’Sullivan played for 11 different NFL teams as a player. He was a member of the New Orleans Saints, Green Bay Packers, Chicago Bears, Minnesota Vikings, New England Patriots, Carolina Panthers, Detroit Lions, San Francisco 49ers, Cincinnati Bengals, San Diego Chargers and Oakland Raiders. He also played for the Frankfurt Galaxy and Saskatchewan Roughriders.