Competitors for 2003 World Junior Men's Water Polo Championships
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Roberto Africano |  ITA |
WAP | 13 April 1983 |
| Matteo Aicardi | ITA |
WAP | 19 April 1986 |
| Roberto Angelone | ITA |
WAP | 3 May 1983 |
| Matteo Astarita | ITA |
WAP | |
| Máté Balatoni |  HUN |
WAP | 20 January 1984 |
| Alessandro Caliogna | ITA |
WAP | 5 March 1984 |
| Marko Ćuk |  SCG |
WAP | 10 January 1984 |
| Károly Czigány | HUN |
WAP | 31 October 1984 |
| Ádám Decker | HUN |
WAP | 29 February 1984 |
| D. Filipović | SCG |
WAP | |
| Filip Filipović |  SRB SCG |
WAP | 2 May 1987 |
| Emanuele Foresti | ITA |
WAP | 4 April 1983 |
| Valentino Gallo | ITA |
WAP | 17 July 1985 |
| András Gárdonyi | HUN |
WAP | 6 February 1986 |
| Massimo Giacoppo | ITA |
WAP | 10 May 1983 |
| Miklós Gór-Nagy | HUN |
WAP | 8 January 1983 |
| Norbert Hosnyánszky | HUN |
WAP | 4 March 1984 |
| Mlađan Janović |  MNE SCG |
WAP | 11 June 1984 |
| Predrag Jokić | MNE SCG |
WAP | 3 February 1983 |
| Michele Lapenna | ITA |
WAP | 14 February 1983 |
| Krisztián Létay | HUN |
WAP | 9 February 1983 |
| Tommaso Morena | ITA |
WAP | 24 April 1985 |
| Viktor Nagy | HUN |
WAP | 24 July 1984 |
| Slobodan Nikić | SRB SCG |
WAP | 25 January 1983 |
| Vjekoslav Pasković | MNE SCG |
WAP | 23 March 1985 |
| Duško Pijetlović | SRB SCG |
WAP | 25 April 1985 |
| Gojko Pijetlović | SRB SCG |
WAP | 7 August 1983 |
| Andrija Prlainović | SRB SCG |
WAP | 28 April 1987 |
| Nikola Rađen | SRB SCG |
WAP | 29 January 1985 |
| Valerio Rizzo | ITA |
WAP | 21 September 1984 |
| Máté Süveges | HUN |
WAP | 31 October 1983 |
| Nándor Szabó | HUN |
WAP | 24 June 1983 |
| Balázs Szirányi | HUN ESP |
WAP | 10 January 1983 |
| Predrag Todorović | MNE SCG |
WAP | |
| Dániel Varga | HUN |
WAP | 25 September 1983 |
| Dénes Varga | HUN |
WAP | 29 March 1987 |
| Boris Zloković | MNE SCG |
WAP | 16 March 1983 |