Competitors for 2004 World Duathlon Championships
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Lino Barruncho |  POR |
TRI | 1976 |
| Will Clarke |  ENG GBR |
TRI | 31 January 1985 |
| Erika Csomor |  HUN |
TRI | 8 November 1973 |
| Annaleah Emmerson | GBR |
TRI | 1970 |
| Michelle Fangmann |  NED |
TRI | |
| Oliver Freeman | GBR |
TRI | 1986 |
| Laura Giordano |  ITA |
TRI | 6 January 1977 |
| Benjamin Grenetier |  FRA |
TRI | 5 July 1981 |
| Anna Hamilton |  NZL |
TRI | |
| Nicole Hofer |  SUI |
TRI | 22 May 1986 |
| Renáta Koch | HUN |
TRI | 23 July 1985 |
| Nicolas Lebrun | FRA |
TRI | 9 April 1973 |
| José Tovar |  ESP |
TRI | 1 December 1982 |
| Martin Urbanovsky |  SVK |
TRI | 1985 |
| Benny Vansteelant |  BEL |
TRI | 19 November 1976 |
| Joerie Vansteelant | BEL |
TRI | 21 June 1982 |
| Miek Vyncke | BEL |
TRI | 1983 |
| Barbara Zutt (-Tesselaar) | NED |
TRI | 7 March 1981 |