2021 European Open – Doubles
# 2021 European Open – Doubles

John Peers and Michael Venus were the defending champions, but chose not to participate this year.

Nicolas Mahut and Fabrice Martin won the title, defeating Wesley Koolhof and Jean-Julien Rojer in the final, 6–0, 6–1.

## Seeds

* Ivan Dodig / Marcelo Melo (quarterfinals)
* Nicolas Mahut / Fabrice Martin (champions)
* Wesley Koolhof / Jean-Julien Rojer (final)
* Sander Gillé / Joran Vliegen (first round)

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Draw

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | I Dodig M Melo | 6 | $7^7$ | | | | | | | | | | | | | | |
| | D Pel B van de Zandschulp | 3 | $6^4$ | | 1 | I Dodig M Melo | 4 | 6 | [7] | | | | | | | | |
| WC | L Harris X Malisse | 6 | $7^7$ | | WC | L Harris X Malisse | 6 | 3 | [10] | | | | | | | | |
| | R Arneodo M Reid | 4 | $6^4$ | | | | | | | 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 | $6^2$ | $7^9$ | [10] | | L Musetti B Paire | | | | | | | | | | | |
| | N Monroe R Opelka | $7^7$ | $6^7$ | [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 | $0^r$ | | | | | | | | | |
| 4 | S Gillé J Vliegen | 7 | 4 | [9] | | | | | | | D Molchanov A Nedovyesov | $6^5$ | 2 | | | | |
| | O Marach P Oswald | 4 | 6 | [10] | | | | | | 2 | N Mahut F Martin | $7^7$ | 6 | | | | |
| | J Erlich A Göransson | 6 | 4 | [6] | | O Marach P Oswald | $6^3$ | 4 | | | | | | | | | |
| WC | R Bemelmans K Coppejans | 3 | 2 | | 2 | N Mahut F Martin | $7^7$ | 6 | | | | | | | | | |
| 2 | N Mahut F Martin | 6 | 6 | | | | | | | | | | | | | | |
