James Cowser (born September 13, 1990) is an American football outside linebacker for the Oakland Raiders of the National Football League (NFL). He played college football at Southern Utah. Cowser was Football Championship Subdivision Defensive Player of the Year (2015). He holds the FCS record for career sacks and tackles for loss.
Cowser signed with the Oakland Raiders after going undrafted in the 2016 NFL Draft. On September 3, 2016, he was waived/injured by the Raiders and placed on injured reserve.  On September 10, he was released from the Raiders' injured reserve.  He was signed to the practice squad on October 4, 2016.  He was promoted to the active roster on November 26, 2016.