2021 European Open – Doubles
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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
- Croatia Ivan Dodig / Brazil Marcelo Melo (quarterfinals)
- France Nicolas Mahut / France Fabrice Martin (champions)
- Netherlands Wesley Koolhof / Netherlands Jean-Julien Rojer (final)
- Belgium Sander Gillé / Belgium Joran Vliegen (first round)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted