| Doubles | ||||
|---|---|---|---|---|
| 2021 Ostrava Challenger | ||||
| Final | ||||
| Champions |  Marc Polmans Sergiy Stakhovsky | |||
| Runners-up |  Andrew Paulson Patrik Rikl | |||
| Score | 7–6, 3–6, | |||
| Events | ||||
| ||||
| ||||
Artem Sitak and Igor Zelenay were the defending champions but only Zelenay chose to defend his title, partnering Roman Jebavý. Zelenay lost in the quarterfinals to Zdeněk Kolář and Lukáš Rosol.
Marc Polmans and Sergiy Stakhovsky won the title after defeating Andrew Paulson and Patrik Rikl 7–6, 3–6, in the final.
Seeds
- Roman Jebavý /
Igor Zelenay (quarterfinals) 
Luis David Martínez / 
Andrei Vasilevski (first round)
Evan King / Hunter Reese (semifinals)
Karol Drzewiecki / Szymon Walków (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
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | R Jebavý I Zelenay
| 6 | 6 | ||||||||||||||||||||||||
 M Guinard A Rinderknech
| 2 | 7 | 1 | R Jebavý I Zelenay
| 3 | 1 | |||||||||||||||||||||
| Z Kolář L Rosol
| 6 | 7 | Z Kolář L Rosol
| 6 | 6 | ||||||||||||||||||||||
| WC | J Lehečka M Vrbenský
| 1 | 6 | Z Kolář L Rosol
| 6 | 2 | |||||||||||||||||||||
| 4 | K Drzewiecki S Walków
| 6 | 6 | M Polmans S Stakhovsky
| 3 | 6 | |||||||||||||||||||||
 L Margaroli A Shamasdin
| 3 | 2 | 4 | K Drzewiecki S Walków
| 6 | 5 | |||||||||||||||||||||
 L Miedler M Safwat
| 6 | 6 | M Polmans S Stakhovsky
| 7 | 7 | ||||||||||||||||||||||
| M Polmans S Stakhovsky
| 4 | 7 | M Polmans S Stakhovsky
| 7 | 3 | ||||||||||||||||||||||
 S Balaji J Nedunchezhiyan
| 6 | 6 | WC | A Paulson P Rikl
| 6 | 6 | |||||||||||||||||||||
| P Polansky B Schnur
| 3 | 3 | S Balaji J Nedunchezhiyan
| 2 | 6 | ||||||||||||||||||||||
 T Gabashvili R Safiullin
| 2 | 3 | 3 | E King H Reese
| 6 | 2 | |||||||||||||||||||||
| 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 | ||||||||||||||||||||
 MT Barrios Vera A Tabilo
| 6 | 2 | MT Barrios Vera A Tabilo
| 6 | 5 | ||||||||||||||||||||||
| 2 | LD Martínez A Vasilevski
| 1 | 6 | ||||||||||||||||||||||||
References
- "Otte To Challenge Karatsev For Ostrava Open Title". September 5, 2020.