| 2025 Cassis Open Provence | |
|---|---|
| Date | 1–7 September |
| Edition | 7th |
| Surface | Hard |
| Location | Cassis, France |
| Champions | |
| Singles | |
 Billy Harris | |
| Doubles | |
 David Pichler / Jurij Rodionov | |
The 2025 Cassis Open Provence was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Cassis, France between 1 and 7 September 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 FRA | Quentin Halys | 70 | 1 |
 EST | Mark Lajal | 147 | 2 |
| GBR | Billy Harris | 151 | 3 |
| AUT | Jurij Rodionov | 154 | 4 |
| FRA | Titouan Droguet | 159 | 5 |
 KAZ | Timofey Skatov | 192 | 6 |
| FRA | Sascha Gueymard Wayenburg | 206 | 7 |
 MON | Valentin Vacherot | 216 | 8 |
The following players received wildcards into the singles main draw:
Étienne Donnet Maé Malige Benoît Paire The following player received entry into the singles main draw through the Next Gen Accelerator programme:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Kenny de Schepper 
Justin Engel Maxime Janvier 
Jakub Paul 
Olaf Pieczkowski Hamish Stewart The following player received entry as a lucky loser:
Billy Harris def. Daniil Glinka 3–6, 7–5, 6–3. David Pichler / Jurij Rodionov def. Arthur Reymond / Luca Sanchez 7–6(7–2), 6–4.
