| Date: | 15 – 21 January |
| Edition: | 9th |
| Surface: | Hard |
| Location: | Nonthaburi, Thailand |
| Champs: |  Matteo Gigante |
| Champd: |  Luke Johnson /  Skander Mansouri |
| Before Name: | Nonthaburi Challenger II |
| Before Year: | 2024 |
| Main Name: | Nonthaburi Challenger |
| After Name: | Nonthaburi Challenger |
The 2024 Nonthaburi Challenger III was a professional tennis tournament played on hard courts. It was the 9th edition of the tournament which was part of the 2024 ATP Challenger Tour. It took place in Nonthaburi, Thailand from 15 to 21 January 2024.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Duje Ajduković | 143 | 1 | ||
| Benjamin Hassan | 150 | 2 | ||
 Japan | Sho Shimabukuro | 152 | 3 | |
| Gijs Brouwer | 154 | 4 | ||
 Czech Republic | ||||
 Ukraine | Vitaliy Sachko | 169 | 6 | |
| Italy | Matteo Gigante | 172 | 7 | |
| Italy | Mattia Bellucci | 180 | 8 |
The following players received wildcards into the singles main draw:
Thanapet Chanta Maximus Jones Kasidit SamrejThe following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
See main article: 2024 Nonthaburi Challenger III – Singles.
Matteo Gigante def. 
Hong Seong-chan 6–4, 6–1.See main article: 2024 Nonthaburi Challenger III – Doubles.
Luke Johnson / Skander Mansouri def. 
Rithvik Choudary Bollipalli / Niki Kaliyanda Poonacha 7–5, 6–4.
