The 1st FINA World Championships in Aquatics were held in the Tašmajdan SRC in Belgrade, SR Serbia, SFR Yugoslavia, from 31 August to 9 September 1973.
* Host nation (Yugoslavia)
47 nations entered the competition.
.svg/1280px-Flag_of_Argentina_(1861%E2%80%932010).svg.png){kind=small}
Argentina
Australia
Austria.svg/1280px-Flag_of_Belgium_(civil).svg.png){kind=small}
Belgium.svg/1280px-Flag_of_Brazil_(1968%E2%80%931992).svg.png){kind=small}
Brazil.svg/1280px-Flag_of_Bulgaria_(1971%E2%80%931990).svg.png){kind=small}
Bulgaria.svg/1280px-Flag_of_Canada_(Pantone).svg.png){kind=small}
Canada
Colombia
Cuba
Denmark
Czechoslovakia
East Germany.svg/1280px-Flag_of_Ecuador_(1900%E2%80%932009).svg.png){kind=small}
Ecuador.svg/1280px-Flag_of_Egypt_(1972%E2%80%931984).svg.png){kind=small}
Egypt
Finland
France
Great Britain.svg/1280px-Flag_of_Greece_(1970-1975).svg.png){kind=small}
Greece
Hungary
Indonesia
Iran
Israel
Italy
Jamaica.svg/1280px-Flag_of_Japan_(1870%E2%80%931999).svg.png){kind=small}
Japan
Luxembourg
Mexico
Netherlands
New Zealand
Norway
Panama
Papua New Guinea
Peru.svg/1280px-Flag_of_Poland_(1928%E2%80%931980).svg.png){kind=small}
Poland.svg/1280px-Flag_of_Puerto_Rico_(1952%E2%80%931995).svg.png){kind=small}
Puerto Rico.svg/1280px-Flag_of_Romania_(1965%E2%80%931989).svg.png){kind=small}
Romania
Soviet Union.svg/1280px-Flag_of_Spain_(1945%E2%80%931977).svg.png){kind=small}
Spain
Sweden
Switzerland.svg/1280px-Flag_of_Tunisia_(1959%E2%80%931999).svg.png){kind=small}
Tunisia
Turkey
United States.png/1280px-Flag_of_Venezuela_(1954%E2%80%932006).png){kind=small}
Venezuela
West Germany.svg/1280px-Flag_of_Yugoslavia_(1946-1992).svg.png){kind=small}
Yugoslavia