2021 Astana Open – Men's doubles
# 2021 Astana Open – Men's doubles

Sander Gillé and Joran Vliegen were the defending champions, but chose not to participate this year.

Santiago González and Andrés Molteni won the title, defeating Jonathan Erlich and Andrei Vasilevski in the final, 6–1, 6–2.

## Seeds

* Santiago González / Andrés Molteni (champions)
* Andrey Golubev / Aleksandr Nedovyesov (quarterfinals)
* Marcelo Demoliner / Rafael Matos (first round)
* André Göransson / Andrea Vavassori (quarterfinals)

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Draw

| First round | First round | First round | First round | First round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | S González A Molteni | 6 | $6^5$ | [10] | | | | | | | | | | | | | |
| WC | D Popko T Skatov | 4 | $7^7$ | [6] | 1 | S González A Molteni | 5 | 6 | [10] | | | | | | | | |
| | D Pel A-u-H Qureshi | $6^4$ | 3 | | | L Glasspool H Heliövaara | 7 | 4 | [8] | | | | | | | | |
| | L Glasspool H Heliövaara | $7^7$ | 6 | | | | | | | 1 | S González A Molteni | 6 | 6 | | | | |
| 4 | A Göransson A Vavassori | 6 | 4 | [11] | | | | | | | R Berankis A Sitak | 4 | 0 | | | | |
| | A Begemann N Lammons | 4 | 6 | [9] | 4 | A Göransson A Vavassori | 5 | 6 | [7] | | | | | | | | |
| | R Berankis A Sitak | 7 | 6 | | | R Berankis A Sitak | 7 | 3 | [10] | | | | | | | | |
| | E Ruusuvuori A Seppi | 5 | 3 | | | | | | | | | | | 1 | S González A Molteni | 6 | 6 |
| | J Munar M Polmans | $7^7$ | 4 | [10] | | | | | | | | | | | J Erlich A Vasilevski | 1 | 2 |
| WC | A Bublik D Golubev | $6^5$ | 6 | [8] | | J Munar M Polmans | 1 | 2 | | | | | | | | | |
| | J Erlich A Vasilevski | 6 | 1 | [10] | | J Erlich A Vasilevski | 6 | 6 | | | | | | | | | |
| 3 | M Demoliner R Matos | 1 | 6 | [7] | | | | | | | J Erlich A Vasilevski | $7^9$ | $7^7$ | | | | |
| | R Arneodo B Bonzi | 6 | 7 | | | | | | | | R Arneodo B Bonzi | $6^7$ | $6^5$ | | | | |
| | R Jebavý J Veselý | 3 | 5 | | | R Arneodo B Bonzi | 6 | 4 | [10] | | | | | | | | |
| | J Duckworth M Ebden | $6^7$ | 2 | | 2 | A Golubev A Nedovyesov | 4 | 6 | [7] | | | | | | | | |
| 2 | A Golubev A Nedovyesov | $7^9$ | 6 | | | | | | | | | | | | | | |
