The 2018–19 Northern Arizona Lumberjacks men's basketball team represented Northern Arizona University during the 2018–19 NCAA Division I men's basketball season.

The Lumberjacks were led by seventh-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 Sacramento State.

[1] He finished at Northern Arizona with a seven-year record of 78–149.

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