| Doubles | |
|---|---|
| 2021 European Open | |
| Champions |  Nicolas Mahut Fabrice Martin |
| Runners-up |  Wesley Koolhof Jean-Julien Rojer |
| Score | 6–0, 6–1 |
John Peers and Michael Venus were the defending champions, but chose not to participate this year. [1]
Nicolas Mahut and Fabrice Martin won the title, defeating Wesley Koolhof and Jean-Julien Rojer in the final, 6–0, 6–1.
Ivan Dodig / 
Marcelo Melo (quarterfinals) Nicolas Mahut / Fabrice Martin (champions) Wesley Koolhof / Jean-Julien Rojer (final)
Sander Gillé / Joran Vliegen (first round)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | I Dodig M Melo | 6 | 77 | ||||||||||||||||||||||||
| D Pel B van de Zandschulp | 3 | 64 | 1 | I Dodig M Melo | 4 | 6 | [7] | ||||||||||||||||||||
| WC |  L Harris X Malisse | 6 | 77 | WC | L Harris X Malisse | 6 | 3 | [10] | |||||||||||||||||||
 R Arneodo  M Reid | 4 | 64 | WC | L Harris X Malisse | 4 | 2 | |||||||||||||||||||||
| 3 | W Koolhof J-J Rojer | 6 | 6 | 3 | W Koolhof J-J Rojer | 6 | 6 | ||||||||||||||||||||
 R Jebavý  A Vasilevski | 4 | 2 | 3 | W Koolhof J-J Rojer | w/o | ||||||||||||||||||||||
 L Musetti B Paire | 62 | 79 | [10] | L Musetti B Paire | |||||||||||||||||||||||
 N Monroe R Opelka | 77 | 67 | [8] | 3 | W Koolhof J-J Rojer | 0 | 1 | ||||||||||||||||||||
 F Nielsen M Sabanov | 4 | 4 | 2 | N Mahut F Martin | 6 | 6 | |||||||||||||||||||||
 D Molchanov  A Nedovyesov | 6 | 6 | D Molchanov A Nedovyesov | 6 | 0 | ||||||||||||||||||||||
 F Delbonis  D Vega Hernández | 5 | 6 | [11] | F Delbonis D Vega Hernández | 3 | 0r | |||||||||||||||||||||
| 4 | S Gillé J Vliegen | 7 | 4 | [9] | D Molchanov A Nedovyesov | 65 | 2 | ||||||||||||||||||||
 O Marach P Oswald | 4 | 6 | [10] | 2 | N Mahut F Martin | 77 | 6 | ||||||||||||||||||||
 J Erlich  A Göransson | 6 | 4 | [6] | O Marach P Oswald | 63 | 4 | |||||||||||||||||||||
| WC | R Bemelmans K Coppejans | 3 | 2 | 2 | N Mahut F Martin | 77 | 6 | ||||||||||||||||||||
| 2 | N Mahut F Martin | 6 | 6 | ||||||||||||||||||||||||
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