| Club: | Slovan Liberec |
| Season: | 2020–21 |
| Chrtitle: | Chairman |
| Chairman: | Zbyněk Štiller |
| Mgrtitle: | Manager |
| Manager: | Pavel Hoftych |
| Stadium: | Stadion u Nisy |
| League: | Czech First League |
| League Result: | 6th |
| Cup1: | Czech Cup |
| Cup1 Result: | Quarter-finals |
| Cup2: | UEFA Europa League |
| Cup2 Result: | Group stage |
| League Topscorer: | Jhon Mosquera (7) |
| Season Topscorer: | Jhon Mosquera (7) |
| Pattern B1: | _nikechallenge3rb |
| Leftarm1: | 0000ff |
| Body1: | 0000ff |
| Rightarm1: | 0000ff |
| Shorts1: | 0000ff |
| Socks1: | FFFFFF |
| Pattern B2: | _nikelegend1920wb |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | FFFFFF |
| Socks2: | 0000ff |
| Updated: | 29 May 2021 |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 FC Slovan Liberec season was the club's 63rd season in existence and its 28th consecutive season in the top flight of Czech football. In addition to the domestic league, Slovan Liberec participated in this season's editions of the Czech Cup and also participated in the UEFA Europa League. The season covered the period from 1 July 2020 to 30 June 2021.
See main article: 2020–21 Czech First League.
See main article: 2020–21 Czech Cup.
See main article: 2020–21 UEFA Europa League.
See main article: 2020–21 UEFA Europa League group stage.