| Mode: | Basketball |
| Year: | 1999-2000 |
| Prev Year: | 1998-98 |
| Next Year: | 2000-01 |
| Team: | Northern Arizona Lumberjacks |
| Conference: | Big Sky Conference |
| Short Conf: | Big Sky |
| Record: | 20–11 |
| Conf Record: | 11–5 |
| Hc Year: | 1st |
| Champion: | Big Sky tournament champions |
The 1999–2000 Northern Arizona Lumberjacks men's basketball team represented Northern Arizona University in the 1999-2000 NCAA Division I men's basketball season. The Lumberjacks were led by head coach Mike Adras, and played their home games at the Walkup Skydome as members of the Big Sky Conference. After finishing third during the conference regular season, Northern Arizona won the Big Sky tournament to receive an automatic bid to the NCAA tournament. As No. 15 seed in the West region, the Lumberjacks lost to No. 2 seed St. John's in the opening round, 61–56.[1]
Source[2]
|-!colspan=12 style=| Non-conference regular season|-!colspan=12 style=| Big Sky regular season|-!colspan=12 style=| Big Sky tournament|-!colspan=12 style=| NCAA tournament|-Source[3]