| 2026 Thionville Open | |
|---|---|
| Date | 2 – 8 March |
| Edition | 2nd |
| Surface | Hard |
| Location | Thionville, France |
| Champions | |
| Singles | |
 Sebastian Ofner | |
| Doubles | |
 Ivan Liutarevich /  Filip Pieczonka | |
The 2026 Thionville Open was a professional tennis tournament played on hardcourts. It was the second edition of the tournament which was part of the 2026 ATP Challenger Tour. It took place in Thionville, France between 2 and 8 March 2026.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 FRA | Hugo Gaston | 95 | 1 |
 GBR | Jan Choinski | 121 | 2 |
 FIN | Otto Virtanen | 131 | 3 |
| AUT | Sebastian Ofner | 132 | 4 |
 ITA | Giulio Zeppieri | 153 | 5 |
 NOR | Nicolai Budkov Kjær | 154 | 6 |
 EST | |||
| FRA | Ugo Blanchet | 168 | 8 |
The following players received wildcards into the singles main draw:
Moïse Kouamé Maé Malige Tom Paris The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Charles Broom 
Murphy Cassone 
Martin Krumich
Kei Nishikori Keegan Smith Yosuke Watanuki The following player received entry as a lucky loser:
Sebastian Ofner def. Nicolai Budkov Kjær 6–7(5–7), 6–3, 7–6(9–7). Ivan Liutarevich / Filip Pieczonka def. Joshua Paris / Luca Sanchez 7–6(13–11), 7–6(7–5).
