| 2025 Thionville Open | |
|---|---|
| Date | 3 – 9 March |
| Edition | 1st |
| Surface | Hard |
| Location | Thionville, France |
| Champions | |
| Singles | |
 Borna Ćorić | |
| Doubles | |
 Jakub Paul /  David Pel | |
The 2025 Thionville Open was a professional tennis tournament played on hardcourts. It was the first edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Thionville, France between 3 and 9 March 2025.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| CRO | Borna Ćorić | 143 | 1 |
 BEL | Alexander Blockx | 153 | 2 |
 FRA | Luca Van Assche | 154 | 3 |
 CAN | Liam Draxl | 175 | 4 |
 JPN | Yuta Shimizu | 180 | 5 |
| FRA | Titouan Droguet | 190 | 6 |
| Alibek Kachmazov | 192 | 7 | |
 GBR | Jan Choinski | 195 | 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:
Matisse Bobichon
Florian Broska
Philip Henning Jakub Paul 
Vitaliy Sachko Henri Squire Borna Ćorić def. Arthur Bouquier 6–4, 6–4. Jakub Paul / David Pel def. Matteo Martineau / Luca Sanchez 6–1, 6–4.