2021 Zagreb Open – Doubles

This was the first edition of the tournament since 2011.

Evan King and Hunter Reese won the title after defeating Andrey Golubev and Aleksandr Nedovyesov 6–2, 7–6(7–4) in the final.

Seeds
• # 🇰🇿 Andrey Golubev / 🇰🇿 Aleksandr Nedovyesov (final)

• # Romain Arneodo / 🇫🇷 Albano Olivetti (semifinals)

• # 🇺🇸 Evan King / 🇺🇸 Hunter Reese (champions)

• # 🇫🇷 Sadio Doumbia / 🇫🇷 Fabien Reboul (withdrew)