Mario Marcell Haggan (born March 3, 1980) is an American former professional football linebacker who played in the National Football League (NFL) for the Buffalo Bills, Denver Broncos, and St. Louis Rams.

He was selected by the Bills in the seventh round of the 2003 NFL draft after playing college football at Mississippi State.

He was named first-team all-state by the Jackson Clarion-Ledger and played in the Mississippi/Alabama All-Star Game.

Haggan was a member of the Bulldogs’ 1998 SEC Western Division championship squad as well as the 10-win 1999 team that led the nation in defense.

[7] He is married to Tanika Haggan who was a volleyball player at Mississippi State and also served as a business education teacher and volleyball coach at Rowlett High School in Rowlett, Texas.