2021 Sibiu Open – Doubles

Hunter Reese and Jan Zieliński were the defending champions but chose not to defend their title.

Alexander Erler and Lucas Miedler won the title after defeating James Cerretani and Luca Margaroli 6–3, 6–1 in the final.

Seeds
• # 🇺🇸 James Cerretani / Luca Margaroli (final)

• # 🇦🇹 Alexander Erler / 🇦🇹 Lucas Miedler (champions)

• # Ruben Gonzales / 🇺🇸 Hunter Johnson (semifinals)

• # 🇷🇴 Victor Vlad Cornea / Petros Tsitsipas (quarterfinals)