The men's water polo tournament at the 2011 World Aquatics Championships, organised by the FINA, was held in Shanghai, China from 18 to 30 July 2011.

The draw resulted in the following groups: All times are China Standard Time (UTC+8) The draw for the competition was held on April 15, 2011.

The group winners have a bye into the quarterfinals.

Stefano Tempesti, Amaurys Perez, Niccolo Gitto, Pietro Figlioli, Alex Giorgetti, Maurizio Felugo, Niccolo Figari, Valentino Gallo, Christian Presciutti, Deni Fiorentini, Matteo Aicardi, Arnaldo Deserti, Giacomo Pastorino Head coach: Sandro Campagna

Stefano Tempesti (c)Amaurys PerezNiccolo GittoPietro FiglioliAlex GiorgettiMaurizio FelugoNiccolo FigariValentino GalloChristian PresciuttiDeni FiorentiniMatteo AicardiArnaldo DesertiGiacomo PastorinoHead coach: Sandro Campagna Slobodan SoroMarko AvramovićŽivko GocićVanja Udovičić (c)Miloš ĆukDuško PijetlovićSlobodan NikićMilan AleksićNikola RađenFilip FilipovićAndrija PrlainovićStefan MitrovićGojko PijetlovićHead coach: Dejan Udovičić Josip PavićDamir BurićMiho BoškovićNikša DobudMaro JokovićPetar MuslimFrano KaračAndro BušljeSandro SuknoSamir Barač (c)Fran PaskvalinPaulo ObradovićIvan BuljubašićHead coach: Ratko Rudić