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.

The following players received wildcards into the singles main draw: The following players received entry into the singles main draw as alternates: The following players received entry from the qualifying draw: The following players received entry as lucky losers: