| Competition: | Swiss Promotion League |
| Season: | 2020–2021 |
| Winners: | Yverdon-Sport |
| Promoted: | Yverdon-Sport |
| Relegated: | Köniz Münsingen |
| Matches: | 176 |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 Promotion League season was the 9th edition (the 7th since its name change).[1] The league is the third highest level in the Swiss football league system, behind the Super League and the Challenge League.
The Championship had 16 teams, of which three were U-21 teams, the eldest youth teams of the Super or Challenge League clubs. The number of U-21 teams permitted in this division was limited to four (until 2022) and they were not eligible to promotion.[2] The top placed team, of those eligible, would be promoted and the two teams lowest in the table would be relegated. However, the start of the season was delayed and the format of the league was modified due to the COVID-19 pandemic situation. In the first stage each team played once against each of the other 15 teams in a round robin format. The table was then divided into two equal groups. The top eight teams again played once against the other seven for the promotion slot and the bottom eight played once against the others to decide relegation.
The previous season had been suspended and later cancelled due to the corona-virus measures. It was not rated and there were no promotions or relegations.[3] Therefore, the teams remained the same as in the previous period.
| Club | Canton | Stadium | Capacity |
|---|---|---|---|
| Basel U-21 | Basel-City | Stadion Rankhof or Youth Campus Basel | |
| FC Bavois | Vaud | Terrain des Peupliers | |
| AC Bellinzona | Ticino | Stadio Comunale Bellinzona | |
| FC Black Stars Basel | Basel-City | Buschwilerhof | |
| FC Breitenrain Bern | Bern | Spitalacker | |
| SC Brühl | St. Gallen | Paul-Grüninger-Stadion | |
| SC Cham | Zug | Stadion Eizmoos | |
| Étoile Carouge FC | Geneva | Stade de la Fontenette | |
| FC Köniz | Bern | Liebefeld | |
| FC Münsingen | Bern | Sportanlage Sandreutenen | |
| FC Stade Nyonnais | Vaud | Stade de Colovray | |
| Rapperswil-Jona | St. Gallen | Stadion Grünfeld | |
| Sion U-21 | Valais | Stade de Tourbillon | |
| SC Young Fellows Juventus | Zürich | Utogrund | |
| Yverdon-Sport FC | Vaud | Stade Municipal | |
| Zürich U-21 | Zürich | Sportplatz Heerenschürli | |