See main article: article and 2021 Geneva Open.
Oliver Marach and Mate Pavić were the two-time defending champions from when the event was last held in 2019[1] but lost in the first round to Tomislav Brkić and Nikola Ćaćić.
John Peers and Michael Venus won the title, defeating Simone Bolelli and Máximo González in the final, 6–2, 7–5.