2021 Ostrava Challenger – Doubles

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(7–4), 3–6, [10–7] 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)