| 2025 Nonthaburi Challenger II | |
|---|---|
| Date | 6 – 11 January |
| Edition | 12th |
| Surface | Hard |
| Location | Nonthaburi, Thailand |
| Champions | |
| Singles | |
 Rio Noguchi | |
| Doubles | |
 Ray Ho /  Neil Oberleitner | |
The 2025 Nonthaburi Challenger II was a professional tennis tournament played on hard courts. It was the 12th edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Nonthaburi, Thailand from 6 to 11 January 2025. [1]
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| TPE | Hsu Yu-hsiou | 239 | 1 |
 ITA | Francesco Maestrelli | 242 | 2 |
 VEN | |||
 CHN | Bai Yan | 255 | 4 |
 CZE | Marek Gengel | 257 | 5 |
| CHN | Sun Fajing | 277 | 6 |
 FRA | Geoffrey Blancaneaux | 279 | 7 |
 SUI | Rémy Bertola | 282 | 8 |
The following players received wildcards into the singles main draw:
Thanapet Chanta Maximus Jones Wishaya Trongcharoenchaikul The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
Kokoro Isomura Zdeněk Kolář Benoît Paire Jakub Paul Hikaru Shiraishi Yusuke Takahashi The following player received entry as a lucky loser:
Rio Noguchi def. Cui Jie 7–6(11–9), 6–2. Ray Ho / Neil Oberleitner def. 
Daniel Cukierman / 
Joshua Paris 6–4, 7–6(7–5).