| Club: | FK Jablonec |
| Season: | 2020–21 |
| Chrtitle: | Chairman |
| Chairman: | Petr Flodrman |
| Mgrtitle: | Manager |
| Manager: | Petr Rada |
| Stadium: | Stadion Střelnice |
| League: | Czech First League |
| League Result: | 3rd |
| Cup1: | Czech Cup |
| Cup1 Result: | Quarter-final |
| Cup2: | UEFA Europa League |
| Cup2 Result: | Second qualifying round |
| Pattern La1: | _jablonec2021h |
| Pattern B1: | _jablonec2021h |
| Pattern Ra1: | _jablonec2021h |
| Pattern So1: | _jablonec2021h |
| Leftarm1: | FFFFFF |
| Body1: | 0B6121 |
| Rightarm1: | FFFFFF |
| Shorts1: | FFFFFF |
| Socks1: | 0B6121 |
| Pattern La2: | _jablonec2021a |
| Pattern B2: | _jablonec2021a |
| Pattern Ra2: | _jablonec2021a |
| Leftarm2: | 000000 |
| Body2: | 000000 |
| Rightarm2: | 000000 |
| Shorts2: | 000000 |
| Socks2: | 000000 |
| Updated: | 27 April 2021 |
| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 FK Jablonec season is the club's 76th season in existence and its 27th consecutive season in the top flight of Czech football. In addition to the domestic league, Jablonec participated in this season's edition of the Czech Cup and the UEFA Europa League. The season covers the period from 1 July 2020 to 30 June 2021.
.[1]
See main article: 2020–21 Czech First League.
See main article: 2020–21 UEFA Europa League.
See main article: 2020–21 Czech Cup.