2021 Astana Open

The 2021 Astana Open was a tennis tournament organized for professional tennis players, held in Nur-Sultan, Kazakhstan, in 2021 on indoor hard courts. It was primarily organized due to the cancellation of many tournaments during the 2021 ATP Tour and 2021 WTA Tour, because of the ongoing COVID-19 pandemic. It is the second edition of the tournament for the men and the first for the women. The tournament took place in Nur-Sultan, Kazakhstan, from 20–26 September for the men, and from 27 September to 2 October for the women.

Champions

Kwon Soon-woo def. James Duckworth, 7–6, 6–3
This was Kwon's first ever career ATP title.

Alison Van Uytvanck def. Yulia Putintseva, 1–6, 6–4, 6–3.
This was Van Uytvanck's fifth singles title, and first of the year.

Santiago González / Andrés Molteni def. Jonathan Erlich / Andrei Vasilevski, 6–1, 6–2

Anna-Lena Friedsam / Monica Niculescu def. Angelina Gabueva / Anastasia Zakharova 6–2, 4–6,

The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

;Before the tournament

The following pairs received wildcards into the doubles main draw:

;Before the tournament

The following players received wildcards into the singles main draw:

The following players received entry using protected rankings:

The following players received entry from the qualifying draw:

;Before the tournament

The following pairs received wildcards into the doubles main draw:

;Before the tournament