Harvey Unga is a former running back for the BYU Cougars football team (Brigham Young University Cougars football). He distinguished himself in their season opener against the Arizona Wildcats in 2007 by earning the Mountain West Conference (MWC) offensive player of the week award. Unga earned that award that season in the final regular game against the Utah Utes. He became the starting running back in 2007 due to the injury of Fui Vakapuna in the prior season. As a starter, Harvey ran for over 1000 yards in just 11 games, with this mark reached in the 2nd quarter against their in-state rivals, Utah, on Nov. 24, 2007.

He was named the MWC Freshman of the Year. As of2007121, he has the second most yards gained by a freshman in the MWC ever, and 3rd among all freshman running backs in the nation this season.

On April 16, 2010, Unga voluntarily withdrew from BYU after violating BYUs honor code (BYU Honor Code), as did his former fiance, Keilani Moeaki, whom he was dating. Unga will enter the July 2010 NFL Supplemental Draft.