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

Brazil has fielded a team of eight swimmers to compete in the open water marathon.

[1] Brazilian 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):[2] Swimmers must qualify at the 2015 Maria Lenk Trophy (for pool events) to confirm their places for the Worlds.

[3] Brazil fielded a full squad of eleven synchronized swimmers to compete in each of the following events at the World Championships.