The 2020 Erste Bank Open was a men's tennis tournament played on indoor hard courts.

It was the 46th edition of the event, and part of the ATP Tour 500 Series of the 2020 ATP Tour.

It was held at the Wiener Stadthalle in Vienna, Austria, from 26 October until 1 November 2020.

One seed Andrey Rublev won the singles title.

[3] The following players received wildcards into the singles main draw: The following player received entry using a special exempt: The following players received entry using a protected ranking into the singles main draw: The following players received entry from the qualifying draw: The following players received entry as lucky losers: The following pairs received wildcards into the doubles main draw: The following pair received entry from the qualifying draw: