The 2024 Zagreb Open was a professional tennis tournament played on outdoor clay courts.

It was part of the 2024 ATP Challenger Tour and the 2024 ITF Women's World Tennis Tour.

It took place in Zagreb, Croatia between 3 and 9 June 2024 for men and 5 and 11 August for women.

The following players received wildcards into the singles main draw: The following player received entry into the singles main draw using a protected ranking: The following player received entry into the singles main draw as an alternate: The following players received entry from the qualifying draw: The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: