Croatia competed at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July and 4 August 2013.

Croatia qualified two quota places for the following diving events:[1] Croatia qualified a single quota in open water swimming:[2] Croatian swimmers 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):[3][4] Croatia has qualified two synchronized swimmers.

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