The 1998 Northern Arizona Lumberjacks football team was an American football team that represented Northern Arizona University (NAU) as a member of the Big Sky Conference (Big Sky) during the 1998 NCAA Division I-AA football season.
In their first year under head coach Jerome Souers, the Lumberjacks compiled a 6–5 record (3–5 against conference opponents), outscored opponents by a total of 241 to 227, and tied for seventh place in the Big Sky.
[1] The team played its home games at the J. Lawrence Walkup Skydome, commonly known as the Walkup Skydome, in Flagstaff, Arizona.