| Mode: | Basketball |
| Sex: | none |
| Year: | 2019–20 |
| Prev Year: | 2018–19 |
| Next Year: | 2020–21 |
| Team: | Northwestern State Demons |
| Conference: | Southland Conference |
| Short Conf: | Southland |
| Record: | 15–15 |
| Conf Record: | 11–9 |
| Hc Year: | 21st |
| Asst Coach1: | Jeff Moore |
| Asst Coach3: | Jacob Spielbauer |
The 2019–20 Northwestern State Demons basketball team represented Northwestern State University in the 2019–20 NCAA Division I men's basketball season. The Demons, led by 21st-year head coach Mike McConathy, played their home games at Prather Coliseum in Natchitoches, Louisiana as members of the Southland Conference. They finished the season 15–15, 11–9 in Southland play to finish in a tie for fourth place. They defeated Texas A&M–Corpus Christi in the first round of the Southland tournament and were set to take on Sam Houston State in the second round until the tournament was cancelled amid the COVID-19 pandemic.
The Demons finished the 2018–19 season 11–20 overall, 6–12 in Southland play to finish in 11th place. Since only the top eight teams are eligible for the Southland tournament, they failed to qualify.
|-!colspan=12 style=| Regular season|-!colspan=12 style=| Southland tournament|-|- style="background:#bbbbbb"| style="text-align:center"|March 12, 2020
5:00 pm, ESPN+| style="text-align:center"| (5)| vs. (4) Sam Houston State
Second round| colspan=2 rowspan=1 style="text-align:center"|Cancelled due to the COVID-19 pandemic[1] | style="text-align:center"|Merrell Center
Katy, TX|-Source[2]
2019–20 Northwestern State Lady Demons basketball team