The 2023 Swiss Open Gstaad (also known as the EFG Swiss Open Gstaad for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts.

It was the 55th edition of the Swiss Open, and part of the ATP Tour 250 Series of the 2023 ATP Tour.

It took place at the Roy Emerson Arena in Gstaad, Switzerland, from 17 through 23 July 2023.

[1] *per team The following players received wildcards into the main draw: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: The following pairs received wildcards into the doubles main draw: The following pair received entry as alternates: