2023 Swiss Open Gstaad

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.

Singles

 * 🇦🇷 Pedro Cachin def. 🇪🇸 Albert Ramos Viñolas, 3–6, 6–0, 7–5

Doubles

 * Dominic Stricker / Stan Wawrinka def. 🇧🇷 Marcelo Demoliner /  Matwé Middelkoop, 7–6(10–8), 6–2

Prize money

 * per team

Seeds

 * † Rankings are as of 3 July 2023

Other entrants
The following players received wildcards into the main draw:
 * 🇮🇹 Fabio Fognini
 * Alexander Ritschard
 * Dominic Stricker

The following players received entry from the qualifying draw:
 * 🇦🇷 Facundo Bagnis
 * 🇧🇪 Zizou Bergs
 * 🇷🇸 Hamad Medjedovic
 * 🇦🇹 Jurij Rodionov

The following player received entry as a lucky loser:
 * 🇫🇮 Otto Virtanen

Withdrawals

 * 🇨🇦 Félix Auger-Aliassime → replaced by 🇫🇷 Arthur Rinderknech
 * 🇨🇿 Jiří Lehečka → replaced by 🇪🇸 Jaume Munar
 * 🇨🇦 Denis Shapovalov → replaced by Stan Wawrinka
 * 🇩🇪 Jan-Lennard Struff → replaced by 🇦🇹 Dominic Thiem
 * 🇸🇪 Mikael Ymer → replaced by 🇫🇮 Otto Virtanen

Seeds

 * † Rankings are as of 3 July 2023

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Mika Brunold / Kilian Feldbausch
 * Dominic Stricker / Stan Wawrinka

The following pair received entry as alternates:
 * 🇧🇪 Zizou Bergs / 🇦🇹 Jurij Rodionov

Withdrawals

 * 🇮🇳 Sriram Balaji / 🇮🇳 Jeevan Nedunchezhiyan → replaced by 🇮🇳 Sriram Balaji / 🇨🇳 Zhang Zhizhen
 * 🇪🇸 Roberto Carballés Baena / 🇻🇪 Luis David Martínez → replaced by 🇧🇪 Zizou Bergs / 🇦🇹 Jurij Rodionov
 * 🇬🇧 Jamie Murray / 🇳🇿 Michael Venus → replaced by 🇧🇴 Boris Arias / 🇧🇴 Federico Zeballos
 * Petros Tsitsipas / Sem Verbeek → replaced by 🇫🇷 Arthur Rinderknech /  Sem Verbeek