Competitors for 2018 Marathon Swimming World Series
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| David Aubry |  FRA |
OWS/SWI | 8 November 1996 |
| Leonie Beck |  GER |
OWS/SWI | 27 May 1997 |
| Sharon van Rouwendaal |  NED |
OWS/SWI | 9 September 1993 |
| Simone Ruffini |  ITA |
OWS | 7 December 1989 |
| Ferry Weertman | NED |
OWS/SWI | 27 June 1992 |
| Finnia Wunram | GER |
OWS | 18 December 1995 |