Bulgaria competed at the 2015 World Aquatics Championships in Kazan, Russia from July 21 to August 9, 2015.

Bulgaria has qualified one high diver at the World Championships.

[1] Bulgaria has qualified one swimmer to compete in the open water marathon.

[2][3] Bulgarian 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):[4][5][6] Bulgaria has qualified two synchronized swimmers to compete in each of the following events.

[7]