The men's water polo tournament at the 2013 World Aquatics Championships, organised by the FINA, was held in the Piscines Bernat Picornell in Barcelona, Spain from 23 July to 3 August 2013.

[1] Hungary won their third title by defeating Montenegro 8–7 in the final match.

[2] 16 teams qualified for the world championships in 2013 as follows: [3] The draw resulted in the following groups: Attila Decker, Viktor Nagy, Bence Bátori, Krisztián Bedő, Ádám Decker, Miklós Gór-Nagy, Balázs Hárai, Norbert Hosnyánszky, Norbert Madaras, Márton Szivós, Dániel Varga, Dénes Varga, Márton Vámos Head coach: Tibor Benedek

Viktor NagyMiklós Gór-NagyNorbert MadarasBence BátoriMárton VámosNorbert HosnyánszkyÁdám DeckerMárton SzivósDániel Varga (c)Dénes Varga Krisztián BedőBalázs HáraiAttila DeckerHead coach: Tibor Benedek Zdravko RadićDraško BrguljanVjekoslav PaskovicAntonio PetrovićDarko BrguljanUgo CrousillatMlađan JanovićNikola Janović (c)Aleksandar IvovićSaša MišićFilip KlikovaćPredrag JokićMiloš Šćepanović]Head coach: Vido Lompar Josip Pavić (c)Luka LončarIvan MilakovićFran PaškvalinMaro JokovićLuka BukićPetar MuslimAndro BušljeSandro SuknoNikša DobudAnđelo ŠetkaPaulo ObradovićMarko BijačHead coach: Ivica Tucak