2021 Banja Luka Challenger – Doubles

Sadio Doumbia and Fabien Reboul were the defending champions but chose not to defend their title.

Antonio Šančić and Nino Serdarušić won the title after defeating Ivan and Matej Sabanov 6–3, 6–3 in the final.

Seeds
• # Ivan Sabanov / Matej Sabanov (final)

• # 🇫🇷 Manuel Guinard / Luca Margaroli (first round, withdrew)

• # 🇨🇿 Zdeněk Kolář / 🇺🇦 Vitaliy Sachko (semifinals)

• # 🇺🇸 James Cerretani / 🇩🇪 Fabian Fallert (semifinals)