Pedro Cachin defeated Albert Ramos Viñolas in the final, 3–6, 6–0, 7–5 to win the singles tennis title at the 2023 Swiss Open Gstaad.

It was his first ATP Tour singles title.

Casper Ruud was the two-time reigning champion,[1] but chose to compete in Båstad instead.

[2] The top four seeds received a bye into the second round.