The 10th FINA World Aquatics Championships were held July 12–27, 2003 in Barcelona, Spain. The championships featured competition in all 5 of FINA's disciplines: Swimming, Diving, Synchronized Swimming, Water Polo, and Open Water Swimming.
Competition was held in the facilities all around the city: Palau Sant Jordi, Piscines Bernat Picornell, Piscina Municipal de Montjuïc, Club de Natació de Barcelona and Port Vell.
Competition dates were:
Host nation