The 2023 Nonthaburi Challenger II was a professional tennis tournament played on hard courts.

It was the 5th edition of the tournament which was part of the 2023 ATP Challenger Tour.

It took place in Nonthaburi, Thailand from 9 to 14 January 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: