The water polo events at the 1998 World Aquatics Championships were held from 7 to 18 January 1998, in Perth, Western Australia.[1]
| Men | | Zoltán Kovacs Zoltán Kósz Tibor Benedek Gergely Kiss Frank Toth Rajmund Fodor Zsolt Varga Barnabás Steinmetz Balázs Vincze Tamás Molnár Tamás Kásás Attila Vári Tamás Marcz Head coach: Dénes Kemény | Aleksandar Ćirić Danilo Ikodinović Dragan Jovanović Nikola Kuljača Aleksandar Nikolić Dušan Popović Dejan Savić Aleksandar Šapić Petar Trbojević Veljko Uskoković Željko Vičević Vladimir Vujasinović Nenad Vukanić Head coach: Nikola Stamenić | |
| Women | | | Naomi Castle, Simone Dixon, Kylie English, Bridgette Gusterson, Yvette Higgins, Bronwyn Mayer, Melissa Mills, Stephanie Neesham, Marian Taylor, Liz Weekes, Sharan Wheelock, Danielle Woodhouse, Taryn Woods. |