| Club: | SV Darmstadt 98 |
| Season: | 2020–21 |
| Chairman: | Klaus Rüdiger Fritsch |
| Manager: | Dimitrios Grammozis |
| Stadium: | Merck-Stadion am Böllenfalltor |
| League: | 2. Bundesliga |
| League Result: | 10th |
| Cup1: | DFB-Pokal |
| Cup1 Result: | Round of 16 |
| League Topscorer: | Serdar Dursun (21) |
| Season Topscorer: | Serdar Dursun (23) |
| Pattern La1: | _darmstadt2021h |
| Pattern B1: | _darmstadt2021h |
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| Pattern B2: | _darmstadt2021a |
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| Pattern B3: | _darmstadt2021t |
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| Shorts3: | 094FC4 |
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| Prevseason: | 2019–20 |
| Nextseason: | 2021–22 |
The 2020–21 SV Darmstadt 98 season is the 123rd season in the football club's history and their 21st overall season in the second tier of German football, the 2. Bundesliga. It is the club's fourth consecutive season in the second division, since relegation from the Bundesliga in 2016–17. In addition to the domestic league, Darmstadt also participated in this season's edition of the DFB-Pokal. The season covers the period from 1 July 2020 to 30 June 2021.
See main article: 2020–21 2. Bundesliga.
See main article: 2020–21 DFB-Pokal.