The 2003 Men's World Water Polo Championship was the tenth edition of the men's water polo tournament at the World Aquatics Championships, organised by the world governing body in aquatics, the FINA.

The tournament was held from 14 to 26 July 2003, and was incorporated into the 2003 World Aquatics Championships in Barcelona, Spain.

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Tibor Benedek, Péter Biros, Rajmund Fodor, István Gergely, Tamás Kásás, Gergely Kiss, Norbert Madaras, Tamás Molnár, Barnabás Steinmetz, Zoltán Szécsi, Tamás Varga, Zsolt Varga, Attila Vári Head coach: Dénes Kemény

Tibor Benedek (c) Péter Biros Rajmund Fodor István Gergely Tamás Kásás Gergely Kiss Norbert Madaras Tamás Molnár Barnabás Steinmetz Zoltán Szécsi Tamás Varga Zsolt Varga Attila VáriHead coachDénes Kemény Alberto Angelini Fabio Bencivenga Fabrizio Buonocore Alessandro Calcaterra Roberto Calcaterra Maurizio Felugo Goran Fiorentini Marco Gerini Andrea Mangiante Francesco Postiglione Bogdan Rath Carlo Silipo (c) Stefano TempestiHead coachPaolo de Crescenzo Aleksandar Ćirić Vladimir Gojković Danilo Ikodinović Viktor Jelenić Predrag Jokić Nikola Kuljača Slobodan Nikić Aleksandar Šapić Dejan Savić Denis Šefik Vanja Udovičić Vladimir Vujasinović (c) Boris ZlokovićHead coach Nenad Manojlović