The men's water polo tournament at the 2009 World Aquatics Championships, organised by the FINA, was held in Rome, Italy from 20 July to 1 August 2009.

[1] All matches were held in a temporary pool at the tennis stadium of the Foro Italico sports complex.

All times are Central European Summer Time (UTC+2) If two teams shall have equal points, further classification shall be established as follows: If there is more than one tie in a group, the highest placed tie shall be determined first.

Slobodan Soro, Marko Avramović, Živko Gocić, Vanja Udovičić, Slavko Gak, Duško Pijetlović, Slobodan Nikić, Milan Aleksić, Nikola Rađen, Filip Filipović, Andrija Prlainović, Stefan Mitrović, Gojko Pijetlović Head coach: Dejan Udovičić.

Slobodan SoroMarko AvramovićŽivko GocićVanja Udovičić (c)Slavko GakDuško PijetlovićSlobodan NikićMilan AleksićNikola RađenFilip FilipovićAndrija PrlainovićStefan MitrovićGojko PijetlovićHead coach: Dejan Udovičić Inaki AguilarMario José GarcíaDavid MartínBlai MallarachGuillermo MolinaMarc MinguellIván GallegoAlbert EspañolXavier VallèsFelipe PerroneIván Pérez (c) Xavier GarcíaDaniel LópezHead coach: Rafael Aguilar Ivo BrzicaDamir BurićMiho BoškovićNikša DobudIvan BuljubašićSrdan AntonijevićFrano KaračAndro BušljeSandro SuknoSamir Barač (c)Igor HinićPaulo ObradovićJosip PavićHead coach: Ratko Rudić