| 2021 Cassis Open Provence | |
|---|---|
| Date | 6–12 September |
| Edition | 3rd |
| Surface | Hard |
| Location | Cassis, France |
| Champions | |
| Singles | |
 Benjamin Bonzi | |
| Doubles | |
 Sriram Balaji / Ramkumar Ramanathan | |
The 2021 Cassis Open Provence was a professional tennis tournament played on hard courts. It was the 3rd edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Cassis, France between 6 and 12 September 2021.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| FRA | Benjamin Bonzi | 94 | 1 |
 JPN | |||
 AUS | |||
 KAZ | Mikhail Kukushkin | 129 | 4 |
| FRA | Lucas Pouille | 133 | 5 |
| FRA | Grégoire Barrère | 136 | 6 |
 AUT | Jurij Rodionov | 140 | 7 |
 GBR | Liam Broady | 147 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Benjamin Bonzi def. Lucas Pouille 7–6(7–4), 6–4. Sriram Balaji / Ramkumar Ramanathan def. 
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