| 2023 Nonthaburi Challenger | |
|---|---|
| Date | 2 – 7 January |
| Edition | 4th |
| Surface | Hard |
| Location | Nonthaburi, Thailand |
| Champions | |
| Singles | |
 Dennis Novak | |
| Doubles | |
 Marek Gengel / Adam Pavlásek | |
The 2023 Nonthaburi Challenger was a professional tennis tournament played on hard courts. It was the 4th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Nonthaburi, Thailand from 2 to 7 January 2023.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 HUN | Fábián Marozsán | 173 | 1 |
| AUT | Dennis Novak | 180 | 2 |
 TPE | Wu Tung-lin | 184 | 3 |
 FRA | Antoine Escoffier | 205 | 4 |
 ITA | Gianluca Mager | 212 | 5 |
 GBR | Paul Jubb | 219 | 6 |
 AUS | Max Purcell | 220 | 7 |
| TPE | Hsu Yu-hsiou | 221 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Alafia Ayeni
Evgeny Donskoy Giovanni Fonio Dayne Kelly Lucas Pouille 
Henri Squire Dennis Novak def. Wu Tung-lin 6–4, 6–4. Marek Gengel / Adam Pavlásek def. Robert Galloway / 
Hans Hach Verdugo 7–6(7–4), 6–4.