| 2019 Koblenz Open | |
|---|---|
| Date | 14–20 January |
| Edition | 3rd |
| Surface | Hard (indoor) |
| Location | Koblenz, Germany |
| Champions | |
| Singles | |
 Gianluca Mager | |
| Doubles | |
 Zdeněk Kolář / Adam Pavlásek | |
The 2019 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the third edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Koblenz, Germany between 14 and 20 January 2019.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 NOR | Casper Ruud | 111 | 1 |
 GER | Yannick Maden | 125 | 2 |
 RUS | Alexey Vatutin | 175 | 3 |
| ITA | Andrea Arnaboldi | 178 | 4 |
| GER | Daniel Brands | 183 | 5 |
 GBR | James Ward | 187 | 6 |
 SWE | Mikael Ymer | 196 | 7 |
 BEL | Arthur De Greef | 200 | 8 |
| CZE | Adam Pavlásek | 203 | 9 |
| GER | Tobias Kamke | 214 | 10 |
 SVK | Filip Horanský | 218 | 11 |
 FRA | Kenny de Schepper | 219 | 12 |
| CZE | Zdeněk Kolář | 220 | 13 |
 NED | Tallon Griekspoor | 234 | 14 |
| NED | Thiemo de Bakker | 243 | 15 |
 BLR | Uladzimir Ignatik | 256 | 16 |
The following players received wildcards into the singles main draw:
Marek Gengel Johannes Härteis Benjamin Hassan Kai Lemstra Julian Lenz The following player received entry into the singles main draw using a protected ranking:
The following players received entry into the singles main draw using their ITF World Tennis Ranking:
Javier Barranco Cosano Raúl Brancaccio Peter Heller Roman Safiullin The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Riccardo Bonadio Bastien Presuhn Gianluca Mager def. Roberto Ortega Olmedo 2–6, 7–6(8–6), 6–2. Zdeněk Kolář / Adam Pavlásek def. 
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