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The 2003 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 2003 NCAA Division I-AA football season. In their sixth year under head coach Jerome Souers, the Lumberjacks compiled a 9–4 record (5–2 against conference opponents), outscored opponents by a total of 409 to 305, and finished in a three-way tie for the Big Sky championship. The team played its home games at the J. Lawrence Walkup Skydome, commonly known as the Walkup Skydome, in Flagstaff, Arizona.