| Year: | 2005 |
| Team: | Northern Arizona Lumberjacks |
| Sport: | football |
| Conference: | Big Sky Conference |
| Short Conf: | Big Sky |
| Record: | 3–8 |
| Conf Record: | 1–7 |
| Head Coach: | Jerome Souers |
| Hc Year: | 8th |
| Stadium: | Walkup Skydome |
The 2005 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 2005 NCAA Division I FCS football season. In their eighth year under head coach Jerome Souers, the Lumberjacks compiled a 3–8 record (1–7 against conference opponents), were outscored by a total of 338 to 233, and finished in a tie for last 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.