Competitors for 2021 International Swimming League (ISL)
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Freya Anderson |  ENG GBR |
SWI | 4 March 2001 |
| Bailey Andison |  CAN |
SWI | 13 November 1997 |
| Zach Apple |  USA |
SWI | 23 April 1997 |
| Alia Atkinson |  JAM |
SWI | 11 December 1988 |
| Helena Bach |  DEN |
SWI | 12 June 2000 |
| Madeline Banic | USA |
SWI | 15 April 1997 |
| Adam Barrett | ENG GBR |
SWI | 30 July 1992 |
| Ilaria Bianchi |  ITA |
SWI | 6 January 1990 |
| Lisa Bratton | USA |
SWI | 5 May 1996 |
| Dylan Carter |  TTO |
SWI | 30 January 1996 |
| Kyle Chalmers |  AUS |
SWI | 25 June 1998 |
| Yevgeniya Chikunova |  NEU RUS |
SWI | 17 November 2004 |
| Michelle Coleman |  SWE |
SWI | 31 October 1993 |
| Tommy Cope | USA |
SWI | 11 January 1997 |
| Ali DeLoof | USA |
SWI | 14 August 1994 |
| Christian Diener |  GER |
SWI | 3 June 1993 |
| Felipe França |  BRA |
SWI | 14 May 1987 |
| Luke Greenbank | ENG GBR |
SWI | 17 September 1997 |
| Guilherme Guido | BRA |
SWI | 12 February 1987 |
| Louise Hansson | SWE |
SWI | 24 November 1996 |
| Zach Harting | USA |
SWI | 27 August 1997 |
| Mary-Sophie Harvey | CAN |
SWI | 11 August 1999 |
| Siobhán Haughey |  HKG |
SWI | 31 October 1997 |
| Brent Hayden | CAN |
SWI | 21 October 1983 |
| Femke Heemskerk |  NED |
SWI | 21 September 1987 |
| Ryan Hoffer | USA |
SWI | 9 July 1998 |
| Zac Incerti | AUS |
SWI | 13 July 1996 |
| Zsu Jakabos |  HUN |
SWI | 3 April 1989 |
| Yuri Kisil | CAN |
SWI | 18 September 1995 |
| Finlay Knox | CAN |
SWI | 8 January 2001 |
| Kliment Kolesnikov | NEU RUS |
SWI | 9 July 2000 |
| Luc Kroon | NED |
SWI | 30 August 2001 |
| Marius Kusch | GER |
SWI | 5 May 1993 |
| Annie Lazor | USA |
SWI | 17 August 1994 |
| Chad le Clos |  RSA |
SWI | 12 April 1992 |
| Felipe Lima | BRA |
MOP/SWI | 5 April 1985 |
| Max Litchfield | ENG GBR |
SWI | 4 March 1995 |
| Florent Manaudou |  FRA |
SWI | 12 November 1990 |
| Kylie Masse | CAN |
SWI | 18 January 1996 |
| Emma McKeon | AUS |
SWI | 24 May 1994 |
| Edward Mildred | ENG GBR |
SWI | 10 April 2003 |
| Cody Miller | USA |
SWI | 9 January 1992 |
| Ross Murdoch | GBR SCO |
SWI | 14 January 1994 |
| Andi Murez |  ISR USA |
SWI | 29 January 1992 |
| Katsumi Nakamura |  JPN |
SWI | 21 February 1994 |
| Leah Neale | AUS |
SWI | 1 August 1995 |
| Mark Nikolayev | RUS |
SWI | 30 July 1997 |
| Jacob Pebley | USA |
SWI | 17 September 1993 |
| Sydney Pickrem | CAN |
SWI | 21 May 1997 |
| Blake Pieroni | USA |
SWI | 15 November 1995 |
| Benedetta Pilato | ITA |
SWI | 18 January 2005 |
| Ben Proud | ENG GBR |
SWI | 21 September 1994 |
| Alberto Razzetti | ITA |
SWI | 2 June 1999 |
| Shane Ryan |  IRL |
SWI | 27 January 1994 |
| Yevgeny Rylov | RUS |
SWI | 23 September 1996 |
| Kayla Sanchez | CAN PHI |
SWI | 7 April 2001 |
| Fabian Schwingenschlögl | GER |
SWI | 15 August 1991 |
| Duncan Scott | GBR SCO |
SWI | 6 May 1997 |
| Katie Shanahan | GBR SCO |
SWI | 25 June 2004 |
| Aleksandr Shchogolev | NEU RUS |
SWI | 6 April 2002 |
| Anastasiya Shkurdai |  BLR NEU |
SWI | 3 January 2003 |
| Ilia Shymanovich | BLR NEU |
SWI | 2 August 1994 |
| Sarah Sjöström | SWE |
SWI | 17 August 1993 |
| Dominika Sztandera |  POL |
SWI | 19 January 1997 |
| Fanny Teijonsalo |  FIN |
SWI | 6 February 1996 |
| Kira Toussaint | NED |
SWI | 22 May 1994 |
| Andreas Vazaios |  GRE SWE |
SWI | 9 May 1994 |
| Marie Wattel | FRA |
SWI | 2 June 1997 |
| Katarzyna Wilk-Wasick | POL |
SWI | 22 March 1992 |
| Andrey Zhilkin | NEU RUS |
SWI | 9 March 1995 |
| Kregor Zirk |  EST |
SWI | 3 July 1999 |