| Doubles | |
|---|---|
| 2021 Almaty Challenger II | |
| Champions |  Vladyslav Manafov Vitaliy Sachko |
| Runners-up |  Corentin Denolly  Adrián Menéndez Maceiras |
| Score | 6–1, 6–4 |
Jesper de Jong and Vitaliy Sachko were the defending champions [1] but only Sachko chose to defend his title, partnering Vladyslav Manafov.
Sachko successfully defended his title after defeating Corentin Denolly and Adrián Menéndez Maceiras 6–1, 6–4 in the final.
Teymuraz Gabashvili / Pavel Kotov (semifinals)
Brayden Schnur / 
Yang Tsung-hua (first round) Corentin Denolly / Adrián Menéndez Maceiras (final)
Denis Istomin / 
Denis Yevseyev (semifinals, withdrew)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | T Gabashvili P Kotov | w/o | |||||||||||||||||||||||||
| WC | Dostanbek Tashbulatov B Zhukayev | w/o | WC | D Tashbulatov B Zhukayev | |||||||||||||||||||||||
| D Popko E Tiurnev | 1 | T Gabashvili P Kotov | 3 | 4 | |||||||||||||||||||||||
| 3 | C Denolly A Menéndez Maceiras | 65 | 6 | [10] | 3 | C Denolly A Menéndez Maceiras | 6 | 6 | |||||||||||||||||||
| V Orlov K Sultanov | 77 | 3 | [4] | 3 | C Denolly A Menéndez Maceiras | 1 | 6 | [10] | |||||||||||||||||||
| WC | Yerassyl Murat Danil Ozernoy | 3 | 65 | WC |  P Fabian A Martin | 6 | 3 | [3] | |||||||||||||||||||
| WC | Patrik Fabian A Martin | 6 | 77 | 3 | C Denolly A Menéndez Maceiras | 1 | 4 | ||||||||||||||||||||
| I Gakhov T Skatov | V Manafov V Sachko | 6 | 6 | ||||||||||||||||||||||||
| Yan Bondarevskiy G Lomakin | w/o | Y Bondarevskiy G Lomakin | |||||||||||||||||||||||||
E Furness  E Kırkın | 4 | D Istomin D Yevseyev | w/o | ||||||||||||||||||||||||
| 4 | D Istomin D Yevseyev | w/o | 4 | D Istomin D Yevseyev | |||||||||||||||||||||||
| V Manafov V Sachko | w/o | V Manafov V Sachko | w/o | ||||||||||||||||||||||||
 M Bašić  N Serdarušić | V Manafov V Sachko | 6 | 3 | [10] | |||||||||||||||||||||||
| C-h Tseng T-l Wu | 6 | 2 | [12] | C-h Tseng T-l Wu | 3 | 6 | [8] | ||||||||||||||||||||
| 2 | B Schnur T-h Yang | 2 | 6 | [10] | |||||||||||||||||||||||
Alejandro Falla was the defending champion, but decided to compete in the 2015 Aircel Chennai Open instead.
Rajeev Ram was the defending champion, but lost in the second round to Daniel Nguyen.
Three-time defending champion Kei Nishikori successfully defended his title, defeating Taylor Fritz in the final, 6–4, 6–4 to win the singles title at the 2016 Memphis Open. Notably, this was only Fritz' third career event on the ATP Tour.
Gerard Granollers and Adrián Menéndez-Maceiras were the defending champions but only Menéndez-Maceiras defended his title, partnering John Paul Fruttero. Ménendez-Maceiras lost in the first round to Luca Margaroli and Hugo Nys.
Diego Schwartzman was the defending champion, but lost in the semifinals to Marin Čilić.
Denis Matsukevich and Andrei Vasilevski were the defending champions but chose to defend their title with different partners. Matsukevich partnered Riccardo Ghedin but lost in the quarterfinals to Laurynas Grigelis and Zdeněk Kolář. Vasilevski partnered Hans Podlipnik-Castillo but lost in the semifinals to Prajnesh Gunneswaran and Vishnu Vardhan.
Purav Raja and Divij Sharan were the defending champions but chose not to defend their title.
Karen Khachanov was the defending champion but lost in the second round to Denis Istomin.
Adrián Menéndez Maceiras was the defending champion but chose not to defend his title.
Viktor Galović was the defending champion but lost in the semifinals to Adrián Menéndez Maceiras.
Jaume Munar was the defending champion but chose not to defend his title.
This was the first edition of the tournament.
Malek Jaziri was the defending champion but chose not to defend his title.
Damir Džumhur was the defending champion, but lost in the quarterfinals to Stan Wawrinka.
Uladzimir Ignatik was the defending champion but lost in the second round to Ugo Humbert.
Jason Kubler was the defending champion but chose not to defend his title.
Lucas Pouille was the defending champion, but lost in the second round to Marcos Baghdatis.
Kevin Anderson was the defending champion, but withdrew before the tournament began because of a right elbow injury.
Benoît Paire defeated defending champion Pablo Andújar in the final, 6–2, 6–3, to win the singles tennis title at the 2019 Grand Prix Hassan II. The win earned Paire his second career Association of Tennis Professionals (ATP) singles title, his first in four years. Andújar saw his 13-match winning streak snapped in the loss after he had won two consecutive ATP Challenger Tour titles in Marbella and Alicante in the two weeks prior to the tournament.
The 2021 Almaty Challenger II was a professional tennis tournament played on clay courts. It was the sixth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 14 and 20 June 2021.