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

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

It took place in Fairfield, California, United States between October 9 and October 15, 2023.

The following players received wildcards into the singles main draw: The following players received entry into the singles main draw using protected rankings: The 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: