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Artem Sitak and Igor Zelenay were the defending champions[1] but only Zelenay chose to defend his title, partnering Roman Jebavý. Zelenay lost in the quarterfinals to Zdeněk Kolář and Lukáš Rosol.
| Doubles | |
|---|---|
| 2021 Ostrava Challenger | |
| Champions |  Marc Polmans Sergiy Stakhovsky |
| Runners-up |  Andrew Paulson Patrik Rikl |
| Score | 7–6(7–4), 3–6, [10–7] |
Marc Polmans and Sergiy Stakhovsky won the title after defeating Andrew Paulson and Patrik Rikl 7–6(7–4), 3–6, [10–7] in the final.
Roman Jebavý / 
Igor Zelenay (quarterfinals)
Luis David Martínez / 
Andrei Vasilevski (first round)
Evan King / Hunter Reese (semifinals)
Karol Drzewiecki / Szymon Walków (quarterfinals)
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
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | R Jebavý I Zelenay
| 6 | 65 | [10] | |||||||||||||||||||||||
 M Guinard A Rinderknech
| 2 | 77 | [3] | 1 | R Jebavý I Zelenay
| 3 | 1 | ||||||||||||||||||||
| Z Kolář L Rosol
| 6 | 77 | Z Kolář L Rosol
| 6 | 6 | ||||||||||||||||||||||
| WC | J Lehečka M Vrbenský
| 1 | 63 | Z Kolář L Rosol
| 6 | 2 | [7] | ||||||||||||||||||||
| 4 |  K Drzewiecki S Walków
| 6 | 6 | M Polmans S Stakhovsky
| 3 | 6 | [10] | ||||||||||||||||||||
 L Margaroli A Shamasdin
| 3 | 2 | 4 | K Drzewiecki S Walków
| 66 | 5 | |||||||||||||||||||||
 L Miedler M Safwat
| 6 | 65 | [1] | M Polmans S Stakhovsky
| 78 | 7 | |||||||||||||||||||||
| M Polmans S Stakhovsky
| 4 | 77 | [10] | M Polmans S Stakhovsky
| 77 | 3 | [10] | ||||||||||||||||||||
 S Balaji J Nedunchezhiyan
| 6 | 6 | WC | A Paulson P Rikl
| 64 | 6 | [7] | ||||||||||||||||||||
| P Polansky B Schnur
| 3 | 3 | S Balaji J Nedunchezhiyan
| 2 | 6 | [6] | |||||||||||||||||||||
 T Gabashvili R Safiullin
| 2 | 3 | 3 |  E King H Reese
| 6 | 2 | [10] | ||||||||||||||||||||
| 3 | E King H Reese
| 6 | 6 | 3 | E King H Reese
| 4 | 4 | ||||||||||||||||||||
| WC | V Kopřiva D Svrčina
| 4 | 3 | WC | A Paulson P Rikl
| 6 | 6 | ||||||||||||||||||||
| WC | A Paulson P Rikl
| 6 | 6 | WC | A Paulson P Rikl
| 3 | 7 | [10] | |||||||||||||||||||
 MT Barrios Vera A Tabilo
| 6 | 2 | [10] | MT Barrios Vera A Tabilo
| 6 | 5 | [8] | ||||||||||||||||||||
| 2 |  LD Martínez A Vasilevski
| 1 | 6 | [6] | |||||||||||||||||||||||
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