Bulgaria is competing at the 2013 World Aquatics Championships in Barcelona, Spain between 19 July and 4 August 2013.

Bulgaria qualified a single quota in open water swimming.

[1] Bulgarian 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):[2][3] Bulgaria had qualified two synchronized swimmers.

[4]