The 2023 Zug Open was a professional tennis tournament played on outdoor clay courts. It was the 2nd edition of the tournament and part of the 2023 ATP Challenger Tour. It took place in Zug, Switzerland between 24 and 30 July 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:
