| Date: | 28 August – 3 September |
| Edition: | 4th |
| Surface: | Hard |
| Location: | Zhangjiagang, China |
| Champs: |  Térence Atmane |
| Champd: | Ray Ho /  Matthew Romios |
| Before Year: | 2019 |
The 2023 International Challenger Zhangjiagang was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Zhangjiagang, China between 28 August and 3 September 2023.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 China | Bu Yunchaokete | 215 | 1 | |
| France | Térence Atmane | 218 | 2 | |
 Japan | Kaichi Uchida | 240 | 3 | |
| Japan | Rio Noguchi | 251 | 4 | |
| Australia | Li Tu | 255 | 5 | |
 Lithuania | Ričardas Berankis | 257 | 7 | |
| Australia | James McCabe | 281 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
Alafia Ayeni
Rubin StathamThe following players received entry from the qualifying draw:
Cui Jie Liu Hanyi Xiao LinangThe following players received entry as lucky losers:
See main article: 2023 International Challenger Zhangjiagang – Singles.
Térence Atmane def. Mikalai Haliak 6–1, 6–2.See main article: 2023 International Challenger Zhangjiagang – Doubles.
Matthew Romios def. Francis Alcantara / Sun Fajing 6–3, 6–4.