Zagreb Open

The Zagreb Open is a professional tennis tournament played on outdoor red clay courts. It is part of the ATP Challenger Tour and was part of the ITF Women's Circuit. It was held annually at the Sportski park Mladost in Zagreb, Croatia, from 1996 to 2011. It returned in 2021 and was played for two years at the Tenis centar Maksimir. After another break in 2023 the tournament moved in 2024 to the Sportsko rekreacijski centar Šalata.

Tom Vanhoudt is the doubles record holder with two titles, along with Ágnes Szávay on the women's counterpart.