Competitors for 2018 World Duathlon Championships
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Costanza Arpinelli |  ITA |
TRI | 2000 |
| Thor Bendix Madsen |  DEN |
TRI | 15 October 1999 |
| Leana Bissig |  SUI |
TRI | 3 January 1999 |
| Mark Buckingham |  GBR |
ATH/TRI | 4 May 1985 |
| Arnaud Dely |  BEL |
ATH/TRI | 22 January 1997 |
| Krzysztof Hadas |  POL |
TRI | 1996 |
| Sandrina Illes |  AUT |
ATH/TRI | 22 September 1986 |
| Yohan Le Berre |  FRA |
TRI | 20 September 1987 |
| Wesley Mols |  NED |
TRI | 1996 |
| Lucie Picard | FRA |
TRI | 21 March 1996 |
| Andreas Schilling | DEN |
TRI | 25 May 1991 |
| Georgina Schwiening |  ENG GBR |
ATH/TRI | 15 December 1994 |
| Hikari Tamura |  JPN |
TRI | 1997 |
| Ai Ueda | JPN |
TRI | 26 October 1983 |
| Joey van 't Verlaat | NED |
TRI | 1999 |
| Shirin van Anrooij | NED |
CYC/TRI | 5 February 2002 |
| Sophie Van der Most | NED |
TRI | 1995 |
| Matthew Willis | GBR |
ATH/TRI | 4 February 2000 |