| Season: | 2020–21 |
| Relegated: | none |
| Nextseason: | 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.
Only in the 2020–21 season,[1] the league will no longer consist of two separate competitions but will be one single league in which all teams play each other four times. There will be no more playoffs, no teams will qualify for the Europa League playoffs and the bottom team will be relegated directly.
| Matricule | Club | City | First season of current spell at second level | Coming from | 2019-20 result | Stadium | Capacity | |
|---|---|---|---|---|---|---|---|---|
| 3 | Brugge | 2020–21 | – | – | Daknamstadion | 12,136 | ||
| 818 | Deinze | 2020–21 | Belgian First Amateur Division | 1st (D1Am) | Burgemeester Van de Wiele Stadion | 7,515 | ||
| 3970 | Lier | 2020–21 | Belgian First Amateur Division | 13th (D1Am) | Herman Vanderpoortenstadion | 14,538 | ||
| 2554 | Lommel | 2018–19 | Belgian First Amateur Division | 6th (D1B) | Soevereinstadion | 8,000 | ||
| 5479 | Molenbeek | 2020–21 | Belgian First Amateur Division | 6th (D1Am) | Edmond Machtens Stadium | 12,266 | ||
| 167 | Seraing | 2020–21 | Belgian First Amateur Division | 4th (D1Am) | Stade du Pairay | 14,234 | ||
| 10 | Saint-Gilles, Brussels | 2015–16 | Belgian Third Division | 4th (D1B) | Stade Joseph Marien | 5,500 | ||
| 2024 | Westerlo | 2017–18 | Belgian First Division A | 1st (D1B) | Het Kuipje | 8,035 |
| Club | Manager | Kit Manufacturer | Sponsors | |
|---|---|---|---|---|
| Club NXT |  Rik De Mil | Macron | Alheembouw | |
| Deinze | Cédric Vlaeminck | Legea | Dakota Vastgoed & Declercq Stortbeton | |
| Lierse Kempenzonen | Tom Van Imschoot | Jako | Keukens Van Lommel | |
| Lommel | Liam Manning | Masita | United Telecom | |
| RWD Molenbeek | Vincent Euvrard | Joma | Symbio | |
| RFC Seraing | Emilio Ferrera | Kappa | VOO, Willy Naessens & Startpeople | |
| Union SG | Felice Mazzù | Le Coq Sportif | Culture et Formation | |
| Westerlo | Bob Peeters | Saller | Soudal |
| Team | Outgoing manager | Manner of departure | Date of vacancy | Position | Replaced by | Date of appointment | |
|---|---|---|---|---|---|---|---|
| Union SG |  Thomas Christiansen | Contract not prolonged [2] | End of 2019–20 season | Pre-season | Felice Mazzù | 24 May 2020 [3] | |
| Lommel | Peter Maes | Contract not prolonged [4] | Liam Manning | 10 July 2020 [5] | |||
| RWD Molenbeek | Frédéric Stilmant (caretaker) | Caretaker replaced | Laurent Demol | 11 June 2020 [6] | |||
| RWD Molenbeek | Laurent Demol | Sacked | 2 December 2020 [7] | 6th | Frédéric Stilmant (caretaker) | 2 December 2020 | |
| RWD Molenbeek | Frédéric Stilmant (caretaker) | Caretaker replaced | 7 December 2020 | 6th | Vincent Euvrard | 7 December 2020 [8] | |
| Deinze | David Gevaert | Sacked | 4 March 2021 [9] | 6th | Cédric Vlaeminck (caretaker) | 4 March 2021 |
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Georges Mikautadze | Seraing | 19 |
| Dante Vanzeir | Union SG | ||
| 3 | Deniz Undav | Union SG | 17 |
| 4 |  Atabey Çiçek | Westerlo | 12 |
| 5 | Lennart Mertens | Deinze | 10 |
| Manfred Ugalde | Lommel | ||
| 7 | Youssef Challouk | Deinze | 8 |
 Kévin Mata | RWDM47 | ||
| Igor Vetokele | Westerlo | ||
| 10 | Dylan De Belder | Deinze | 7 |
| Leandro Rocha | RWDM47 | ||
| Nicolas Rommens | RWDM47 | ||
| Alessio Staelens | Deinze | ||
| Lukas Van Eenoo | Westerlo | ||
| Anass Zaroury | Lommel |
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 | Youssef Challouk | Deinze | 10 |
| 2 | Christian Brüls | Westerlo | 7 |
| Kevin Kis | Lommel | ||
| Casper Nielsen | Union SG | ||
| Alessio Staelens | Deinze | ||
| Dante Vanzeir | Union SG |
| Rank | Player | Club | Goals | |
|---|---|---|---|---|
| 1 |  Anthony Moris | Union SG | 10 | |
| 2 | Guillaume Dietsch | Seraing | 9 | |
| 3 | Berke Özer | Westerlo | 8 | |
| 4 | Anthony Sadin | RWDM47 | 5 | |
| 5 | William Dutoit | Deinze | 4 |
Upon completion of the regular season a team of the season award was compiled, based upon the results of the team of the week results throughout the season, constructed based on nominations from managers, assistant-managers, journalists and analysts. The results were announced from 4 May 2021, with one player revealed each day.
|
While Club NXT is a team from West Flanders, they are playing their home matches in Lokeren, which is located in East Flanders.
| Number of teams | Province or region | Team(s) |
|---|---|---|
| 2 | Lierse Kempenzonen and Westerlo | |
| RWD Molenbeek and Union SG | ||
| 1 | Deinze | |
| Seraing | ||
| Lommel | ||
| Club NXT |