| 2021 Erste Bank Open | |
|---|---|
| Date | 25–31 October |
| Edition | 47th |
| Category | ATP Tour 500 Series |
| Draw | 32S / 16D |
| Prize money | €1,952,015 |
| Surface | Hard (indoor) |
| Location | Vienna, Austria |
| Venue | Wiener Stadthalle |
| Champions | |
| Singles | |
 Alexander Zverev[1] | |
| Doubles | |
 Juan Sebastián Cabal / Robert Farah[2] | |
The 2021 Erste Bank Open was a men's tennis tournament played on indoor hard courts. It was the 47th edition of the event, and part of the ATP Tour 500 Series of the 2021 ATP Tour. It was held at the Wiener Stadthalle in Vienna, Austria, from 25 until 31 October 2021. Second-seeded Alexander Zverev won the singles title.[3]
- ^ "2021 Vienna – Singles draw". Association of Tennis Professionals (ATP).
- ^ "2021 Vienna – Doubles draw". Association of Tennis Professionals (ATP).
- ^ "Erste Bank Open Overview". atptour.com.