| Doubles | |
|---|---|
| 2021 JC Ferrero Challenger Open | |
| Champions |  Denys Molchanov  David Vega Hernández |
| Runners-up |  Romain Arneodo  Matt Reid |
| Score | 6–4, 6–2 |
Enzo Couacaud and Albano Olivetti were the defending champions [1] but chose not to defend their title.
Denys Molchanov and David Vega Hernández won the title after defeating Romain Arneodo and Matt Reid 6–4, 6–2 in the final.
André Göransson / 
Szymon Walków (first round) Romain Arneodo / Matt Reid (final) Denys Molchanov / David Vega Hernández (champions)
Robert Galloway / Alex Lawson (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | A Göransson S Walków | 4 | 2 | ||||||||||||||||||||||||
 J Nedunchezhiyan P Raja | 6 | 6 | J Nedunchezhiyan P Raja | 6 | 6 | ||||||||||||||||||||||
| WC | D Marrero Dhruva Mulye | 6 | 2 | WC | D Marrero D Mulye | 2 | 3 | ||||||||||||||||||||
 D Popko D Yevseyev | 1 | 0r | J Nedunchezhiyan P Raja | 4 | 4 | ||||||||||||||||||||||
| 3 | D Molchanov D Vega Hernández | 6 | 6 | 3 | D Molchanov D Vega Hernández | 6 | 6 | ||||||||||||||||||||
 T Gabashvili N Kuhn | 1 | 2 | 3 | D Molchanov D Vega Hernández | 6 | 1 | [12] | ||||||||||||||||||||
 B Gojo K Żuk | 6 | 6 | B Gojo K Żuk | 3 | 6 | [10] | |||||||||||||||||||||
| S Balaji R Ramanathan | 4 | 3 | 3 | D Molchanov D Vega Hernández | 6 | 6 | |||||||||||||||||||||
 L Miedler D Sharan | 62 | 4 | 2 | R Arneodo M Reid | 4 | 2 | |||||||||||||||||||||
| WC | Diego Augusto Barreto Sánchez D Rincón | 77 | 6 | WC | DA Barreto Sánchez D Rincón | 1 | 64 | ||||||||||||||||||||
| A Menéndez Maceiras M Vilella Martínez | 6 | 4 | [6] | 4 | R Galloway A Lawson | 6 | 77 | ||||||||||||||||||||
| 4 | R Galloway A Lawson | 4 | 6 | [10] | 4 | R Galloway A Lawson | 4 | 4 | |||||||||||||||||||
A Šančić  A Sitak | 3 | 6 | [6] | 2 | R Arneodo M Reid | 6 | 6 | ||||||||||||||||||||
| WC | Em Nava F Verdasco | 6 | 4 | [10] | WC | Em Nava F Verdasco | |||||||||||||||||||||
| K Drzewiecki P Matuszewski | 6 | 3 | [5] | 2 | R Arneodo M Reid | w/o | |||||||||||||||||||||
| 2 | R Arneodo M Reid | 3 | 6 | [10] | |||||||||||||||||||||||
Tim Pütz and Jan-Lennard Struff were the defending champions but chose not to defend their title.
Romain Arneodo and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Hugo Nys and Tim Pütz were the defending champions but only Nys chose to defend his title, partnering Romain Arneodo. Nys successfully defended his title.
Daniele Bracciali and Matteo Donati were the defending champions but chose not to defend their title.
Julio Peralta and Horacio Zeballos were the defending champions, but Peralta chose not to participate this year. Zeballos played alongside Leonardo Mayer, but lost in the first round to Pablo Cuevas and Nicolás Jarry.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
Kevin Krawietz and Andreas Mies were the defending champions but chose not to defend their title.
Philipp Oswald and Filip Polášek were the defending champions but chose not to defend their title.
Andrey Golubev and Aleksandr Nedovyesov were the defending champions but chose not to defend their title.
Kevin Krawietz and Andreas Mies were the defending champions but chose not to defend their title.
Frederik Nielsen and Tim Pütz were the defending champions but chose not to defend their title.
Romain Arneodo and Hugo Nys were the defending champions but lost in the quarterfinals to Benjamin Bonzi and Antoine Hoang.
Gerard Granollers and Pedro Martínez were the defending champions but chose not to defend their title.
Nuno Borges and Francisco Cabral were the defending champions but lost in the semifinals to Hunter Reese and Sem Verbeek.
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.
Denys Molchanov and Andrei Vasilevski were the defending champions but only Molchanov chose to defend his title, partnering Aleksandr Nedovyesov. Molchanov lost in the semifinals to Sadio Doumbia and Fabien Reboul.
Benjamin Bonzi and Antoine Hoang were the defending champions but chose not to defend their title.
Romain Arneodo and Tristan-Samuel Weissborn were the defending champions but only Arneodo chose to defend his title, partnering Andrei Vasilevski. Arneodo lost in the first round to Elliot Benchetrit and Eliakim Coulibaly.
Antonio Šančić and Artem Sitak were the defending champions but only Sitak chose to defend his title, partnering Sem Verbeek. Sitak lost in the first round to Dan Added and Albano Olivetti.
Antonio Šančić and Tristan-Samuel Weissborn were the defending champions but only Weissborn chose to defend his title, partnering Romain Arneodo. Weissborn lost in the quarterfinals to Marco Bortolotti and Sergio Martos Gornés.