2021 Sibiu Open – Doubles
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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
- United States James Cerretani / Switzerland Luca Margaroli (final)
- Austria Alexander Erler / Austria Lucas Miedler (champions)
- Philippines Ruben Gonzales / United States Hunter Johnson (semifinals)
- Romania Victor Vlad Cornea / Greece Petros Tsitsipas (quarterfinals)
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