| 2023 Koblenz Open | |
|---|---|
| Date | 30 January – 5 February |
| Edition | 5th |
| Surface | Hard (indoor) |
| Location | Koblenz, Germany |
| Champions | |
| Singles | |
 Roman Safiullin | |
| Doubles | |
 Fabian Fallert / Hendrik Jebens | |
The 2023 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the fifth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Koblenz, Germany from 30 January to 5 February 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CHN | Zhang Zhizhen | 96 | 1 |
| Roman Safiullin | 97 | 2 | |
 CAN | Vasek Pospisil | 99 | 3 |
| GER | Maximilian Marterer | 142 | 4 |
 FRA | Hugo Grenier | 147 | 5 |
 GBR | Liam Broady | 158 | 6 |
| FRA | Alexandre Müller | 160 | 7 |
 NED | Gijs Brouwer | 161 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
Raphaël Collignon Lucas Gerch Robin Haase Daniel Masur Louis Wessels The following players received entry from the qualifying draw:
Roman Safiullin def. Vasek Pospisil 6–2, 7–5. Fabian Fallert / Hendrik Jebens def. Jonathan Eysseric / 
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