Competitors for 2020 Marathon Swimming World Series
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Leonie Beck |  GER |
OWS/SWI | 27 May 1997 |
| Ana Marcela Cunha |  BRA |
OWS/SWI | 23 March 1992 |
| Rob Muffels | GER |
OWS/SWI | 8 December 1994 |
| Marc-Antoine Olivier |  FRA |
OWS/SWI | 18 June 1996 |
| Sharon van Rouwendaal |  NED |
OWS/SWI | 9 September 1993 |
| Florian Wellbrock | GER |
OWS/SWI | 19 August 1997 |