The 2023 Northern Arizona Lumberjacks football team represented Northern Arizona University as a member of the Big Sky Conference during the 2023 NCAA Division I FCS football season. The Lumberjacks were led by fifth-year head coach Chris Ball and played home games at the Walkup Skydome in Flagstaff, Arizona.
On July 23, 2023, during the virtual Big Sky Kickoff, the Lumberjacks were predicted to finish ninth in the Big Sky by the coaches and eight by the media.