The FINA World Masters Championships (or "Masters Worlds") is an international Aquatics championships for adults (per FINA rules, Masters are 25 years old and older). The championships is held biennially, with competition in all five of FINA's disciplines: Swimming, Diving, Water polo, Open water swimming, and Synchronized swimming. Starting in 2015, the competition was held jointly with the FINA World Aquatics Championships.