| Date: | 2 – 7 January |
| Edition: | 4th |
| Surface: | Hard |
| Location: | Nonthaburi, Thailand |
| Champs: |  Dennis Novak |
| Champd: |  Marek Gengel / Adam Pavlásek |
| Before Name: | Nonthaburi Challenger III |
| After Year: | 2023 |
| After Name: | Nonthaburi Challenger II |
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 | |
|---|---|---|---|---|
 Hungary | Fábián Marozsán | 173 | 1 | |
| Austria | Dennis Novak | 180 | 2 | |
| Wu Tung-lin | 184 | 3 | ||
 France | Antoine Escoffier | 205 | 4 | |
 Italy | Gianluca Mager | 212 | 5 | |
 United Kingdom | Paul Jubb | 219 | 6 | |
 Australia | Max Purcell | 220 | 7 | |
| Hsu Yu-hsiou | 221 | 8 |
The following players received wildcards into the singles main draw:
Maximus Jones Palaphoom Kovapitukted Thantub SuksumrarnThe following players received entry from the qualifying draw:
Alafia Ayeni Giovanni Fonio Dayne Kelly Lucas PouilleSee main article: 2023 Nonthaburi Challenger – Singles.
Dennis Novak def. Wu Tung-lin 6–4, 6–4.See main article: 2023 Nonthaburi Challenger – Doubles.
Marek Gengel / Adam Pavlásek def. Robert Galloway / 
Hans Hach Verdugo 7–6(7–4), 6–4.