| Doubles | |
|---|---|
| 2016 Sparkassen ATP Challenger | |
| Champions |  Kevin Krawietz  Albano Olivetti |
| Runners-up |  Frank Dancevic  Marko Tepavac |
| Final score | 6–4, 6–4 |
Maximilian Neuchrist and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Kevin Krawietz and Albano Olivetti won the title after defeating Frank Dancevic and Marko Tepavac 6–4, 6–4 in the final.
Roman Jebavý / 
Antonio Šančić (semifinals)
Sander Arends / 
Mateusz Kowalczyk (first round)
Riccardo Ghedin / Dino Marcan (semifinals) Kevin Krawietz / Albano Olivetti (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | R Jebavý A Šančić | 710 | 65 | [10] | |||||||||||||||||||||||
| M Draganja T Draganja | 68 | 77 | [8] | 1 | R Jebavý A Šančić | 6 | 6 | ||||||||||||||||||||
| WC | G Mager A Vavassori | 3 | 3 | S Caruso A Giannessi | 3 | 1 | |||||||||||||||||||||
| S Caruso A Giannessi | 6 | 6 | 1 | R Jebavý A Šančić | 6 | 67 | [10] | ||||||||||||||||||||
| 4 | K Krawietz A Olivetti | 6 | 6 | 4 | K Krawietz A Olivetti | 4 | 79 | [12] | |||||||||||||||||||
| F Gaio S Napolitano | 3 | 4 | 4 | K Krawietz A Olivetti | 77 | 6 | |||||||||||||||||||||
| Z Kolář N Serdarušić | 4 | 4 | WC | M Berrettini L Sonego | 62 | 2 | |||||||||||||||||||||
| WC | M Berrettini L Sonego | 6 | 6 | 4 | K Krawietz A Olivetti | 6 | 6 | ||||||||||||||||||||
 A Menéndez-Maceiras L Vanni | 712 | 3 | [14] | F Dancevic M Tepavac | 4 | 4 | |||||||||||||||||||||
A Motti  R Ramanathan | 610 | 6 | [16] | A Motti R Ramanathan | 4 | 67 | |||||||||||||||||||||
 T Altuna  A Bublik | 6 | 4 | [9] | 3 | R Ghedin D Marcan | 6 | 79 | ||||||||||||||||||||
| 3 | R Ghedin D Marcan | 2 | 6 | [11] | 3 | R Ghedin D Marcan | 4 | 2 | |||||||||||||||||||
| D Pel Ilija Vučić | 6 | 7 | F Dancevic M Tepavac | 6 | 6 | ||||||||||||||||||||||
| WC | Patrick Prader Patric Prinoth | 1 | 5 | D Pel I Vučić | 3 | 7 | [5] | ||||||||||||||||||||
| F Dancevic M Tepavac | 77 | 7 | F Dancevic M Tepavac | 6 | 5 | [10] | |||||||||||||||||||||
| 2 | S Arends M Kowalczyk | 63 | 5 | ||||||||||||||||||||||||
Pierre-Hugues Herbert and Kevin Krawietz were the defending champions. However, Herbert was no longer eligible to compete as a Junior. Krawietz competed with Peter Heller and lost in the semifinals to Lewis Burton and George Morgan.
Tomáš Berdych was the defending champion, but chose not to compete.
Grigor Dimitrov won the title, defeating David Ferrer in the final, 2–6, 6–3, 6–4.
Roger Federer was the defending champion and successfully defended his title, defeating Alejandro Falla in the final, 7–6(7–2), 7–6(7–3).
Divij Sharan and Ken Skupski were the defending champions but chose not to defend their title.
Ruben Bemelmans and Philipp Petzschner were the defending champions but chose not to defend their title.
Johan Brunström and Andreas Siljeström were the defending champions but chose not to defend their title.
Wesley Koolhof and Matwé Middelkoop were the defending champions but chose not to participate.
Tristan Lamasine and Albano Olivetti were the defending champions but only Olivetti chose to defend his title, partnering Kevin Krawietz. Olivetti lost in the first round to Ken and Neal Skupski.
Ken and Neal Skupski were the defending champions but chose not to defend their title.
Pierre-Hugues Herbert and Albano Olivetti were the defending champions but only Olivetti chose to defend his title, partnering Kevin Krawietz. Olivetti lost in the first round to Roman Jebavý and Igor Zelenay.
Kevin Krawietz and Albano Olivetti were the defending champions but chose not to defend their title.
Kevin Krawietz and Albano Olivetti were the defending champions but lost in the first round to Tomasz Bednarek and David Pel.
Kevin Krawietz and Albano Olivetti were the defending champions but lost in the first round to Aliaksandr Bury and Andreas Siljeström.
Kevin Krawietz and Andreas Mies were the defending champions and successfully defended their title, defeating Mate Pavić and Bruno Soares in the final, 6–3, 7–5.
Marcelo Arévalo and Tomislav Brkić were the defending champions but chose not to defend their title.
Andre Begemann and Daniel Masur were the defending champions but chose to defend their title with different partners. Begemann partnered Albano Olivetti but lost in the semifinals to Lloyd Glasspool and Harri Heliövaara. Masur partnered Julian Lenz but lost in the semifinals to Zdeněk Kolář and Andrea Vavassori.
Nicolas Mahut and Pierre-Hugues Herbert defeated Alexander Bublik and Andrey Golubev in the final, 4–6, 7–6(7–1), 6–4, to win the men's doubles title at the 2021 French Open. It was their second French Open title and fifth major title together. They saved match points in their semifinal match against Juan Sebastián Cabal and Robert Farah. Bublik and Golubev became the first male Kazakhstani players to reach a major final.
Sander Gillé and Joran Vliegen were the reigning champions from when the tournament was last held in 2019, but chose not to defend their title.
Ariel Behar and Andrey Golubev were the defending champions but chose not to defend their title.
Romain Arneodo and Hugo Nys were the defending champions but only Arneodo chose to defend his title, partnering Quentin Halys. Arneodo lost in the quarterfinals to Antoine Hoang and Kyrian Jacquet.