The 2017–18 Northern Arizona Lumberjacks men's basketball team represented Northern Arizona University during the 2017–18 NCAA Division I men's basketball season.

The Lumberjacks were led by sixth-year head coach Jack Murphy and played their home games at the Walkup Skydome in Flagstaff, Arizona as members of the Big Sky Conference.

They lost in the first round of the Big Sky tournament to Northern Colorado.

Due to Northern Colorado's self-imposed postseason ban, the Lumberjacks were the No.

9 seed in the Big Sky tournament where the lost in the first round to Portland State.