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] The following players received wildcards into the singles main draw: The following player received entry into the singles main draw as an alternate: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: