The third season of the American serial drama television series Friday Night Lights began airing in the United States and Canada on October 1, 2008. It was the first season to be aired on DirecTV's The 101 Network. The 13-episode season concluded on The 101 Network on January 14, 2009 and then began its run on NBC two nights later on January 16, 2009. The show was renewed for two more seasons in March 2009, with both seasons airing in the same format as season 3, containing 13 episodes each.

The season continued to focus around the Dillon Panthers and the pressures faced on and off the field. This season also saw four main characters leave the show by season's end.