2020–21 Belgian First Division B
| Season | 2020–21 |
|---|---|
| Champions | Union SG |
| Promoted | Union SG Seraing |
| Relegated | none |
← 2019–20 2021–22 → | |
The 2020–21 season of the Belgian First Division B began in August 2020 and ended in April 2021. Union SG became champions on 13 March 2021, returning to the highest level of Belgian football for the first time since the 1972–73 season.