Croatia competed at the 2015 World Aquatics Championships in Kazan, Russia from 24 July to 9 August 2015.

Croatian divers qualified for the individual spots and synchronized teams at the World Championships.

[1][2] Croatia has qualified two swimmers to compete in the open water marathon.

[3][4] Croatian swimmers have achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard):[5][6][7] Croatia has qualified two synchronized swimmers to compete in each of the following events.

[8]