The water polo events at the 2003 World Aquatics Championships were held from 13 to 26 July 2003, in Barcelona, Spain.^[1]

Rank	Nation	Gold	Silver	Bronze	Total
1	Hungary (HUN)	1	0	0	1
	United States (USA)	1	0	0	1
3	Italy (ITA)	0	2	0	2
4	Russia (RUS)	0	0	1	1
	Serbia and Montenegro (SCG)	0	0	1	1
Totals (5 entries)		2	2	2	6

Event	Gold	Silver	Bronze
Men details	Hungary[1] 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	Italy Alberto Angelini Fabio Bencivenga Fabrizio Buonocore Alessandro Calcaterra Roberto Calcaterra Maurizio Felugo Goran Fiorentini Marco Gerini Andrea Mangiante Francesco Postiglione Bogdan Rath Carlo Silipo Stefano Tempesti Head coach Paolo de Crescenzo	Serbia and Montenegro Aleksandar Ćirić Vladimir Gojković Danilo Ikodinović Viktor Jelenić Predrag Jokić Nikola Kuljača Slobodan Nikić Aleksandar Šapić Dejan Savić Denis Šefik Vanja Udovičić Vladimir Vujasinović Boris Zloković Head coach Nenad Manojlović
Women details	United States[1] Nicolle Payne Heather Petri Ericka Lorenz Brenda Villa Ellen Estes Natalie Golda Margaret Dingeldein Jacqueline Frank Heather Moody Robin Beauregard Amber Stachowski Gabrielle Domanic Thalia Munro Head coach Guy Baker	Italy Francesca Conti Martina Miceli Carmela Allucci Silvia Bosurgi Erika Lava Manuela Zanchi Tania di Mario Cinzia Ragusa Giusi Malato Alexandra Araujo Maddalena Musumeci Melania Grego Noémi Tóth Head coach Pierluigi Formiconi	Russia Valentina Vorontsova Natalya Shepelina Yekaterina Salimova Sofia Konoukh Yelena Smurova Galina Zlotnikova Anastassia Zoubkova Veronika Linkova Tatiana Petrova Olga Turova Ekaterina Shishova Svetlana Bogdanova Maria Yaina Head coach Yury Mitianin