See main article: article and 2021 Swiss Open Gstaad.
Sander Gillé and Joran Vliegen were the reigning champions from when the tournament was last held in 2019,[1] but chose not to participate this year.
Marc-Andrea Hüsler and Dominic Stricker won the title, defeating Szymon Walków and Jan Zieliński in the final, 6–1, 7–6(9–7).