2021 Erste Bank Open – Doubles

Łukasz Kubot and Marcelo Melo were the defending champions, but Kubot chose not to participate. Melo played alongside Ivan Dodig, but lost in the first round to Feliciano López and Stefanos Tsitsipas.

Juan Sebastián Cabal and Robert Farah won the title, defeating Rajeev Ram and Joe Salisbury in the final, 6–4, 6–2.

Seeds
• # Nikola Mektić / Mate Pavić (quarterfinals)

• # 🇺🇸 Rajeev Ram / 🇬🇧 Joe Salisbury (final)

• # 🇦🇺 John Peers / 🇸🇰 Filip Polášek (semifinals)

• # 🇨🇴 Juan Sebastián Cabal / 🇨🇴 Robert Farah (champions)

Seeds
• # 🇮🇹 Simone Bolelli / 🇦🇷 Máximo González (first round)

• # 🇧🇪 Sander Gillé / 🇩🇪 Dominik Koepfer (qualifying competition, lucky losers)

Qualifiers

 * 1) 🇦🇹 Alexander Erler / 🇦🇹 Lucas Miedler

Lucky losers

 * 1) 🇧🇪 Sander Gillé / 🇩🇪 Dominik Koepfer