| Mode: | Basketball |
| Year: | 2020-21 |
| Prev Year: | 2019-20 |
| Next Year: | 2021-22 |
| Team: | Northern Arizona Lumberjacks |
| Conference: | Big Sky Conference |
| Short Conf: | Big Sky |
| Record: | 6–16 |
| Conf Record: | 4–10 |
| Hc Year: | 2nd |
| Asst Coach1: | Gaellan Bewernick |
| Asst Coach2: | Tyler Ojanen |
| Asst Coach3: | Chris Fowler |
| Ac1 Year: | 2nd |
| Ac2 Year: | 2nd |
| Ac3 Year: | 1st |
| Captain: | Brooks DeBisschop |
| Captain2: | Luke Avdalovic |
| Captain3: | Cameron Shelton |
| Stadium: | Rolle Activity Center |
The 2020–21 Northern Arizona Lumberjacks men's basketball team represented Northern Arizona University in the 2020-21 NCAA Division I men's basketball season. The Lumberjacks were led by second year head coach Shane Burcar, and played their home games at the Rolle Activity Center as members of the Big Sky Conference. They finished the season 6–16, 4–10 in Big Sky Play to finish in 10th place. They defeated Portland State in the first round before losing in the quarterfinals to Eastern Washington.
The Lumberjacks finished the 2019-20 season 16–14 overall, 10–10 in Big Sky play to finish in a tie for 5th place - both improvements from the previous season. In the Big Sky Conference tournament, they lost to Idaho State in the first round.
|-!colspan=12 style=| Regular season|-!colspan=12 style=| Big Sky tournament|-|-Source[1]