Competitors for 2021 International Swimming League (ISL)
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Javier Acevedo |  CAN |
SWI | 28 January 1998 |
| Freya Anderson |  ENG GBR |
SWI | 4 March 2001 |
| Minna Atherton |  AUS |
SWI | 17 May 2000 |
| 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 |
| Erika Brown-Connolly | USA |
SWI | 27 August 1998 |
| Kim Busch |  NED |
SWI | 16 June 1998 |
| Dylan Carter |  TTO |
SWI | 30 January 1996 |
| Kyle Chalmers | AUS |
SWI | 25 June 1998 |
| Yevgeniya Chikunova |  NEU RUS |
SWI | 17 November 2004 |
| Apostolos Christou |  GRE |
SWI | 1 November 1996 |
| Tom Dean | ENG GBR |
SWI | 2 May 2000 |
| Christian Diener |  GER |
SWI | 3 June 1993 |
| Caeleb Dressel | USA |
SWI | 16 August 1996 |
| Emily Escobedo | USA |
SWI | 17 December 1995 |
| Nic Fink | USA |
SWI | 3 July 1993 |
| Hali Flickinger | USA |
SWI | 7 July 1994 |
| Kristian Gkolomeev | GRE |
SWI | 4 July 1993 |
| Anastasia Gorbenko |  ISR |
SWI | 7 August 2003 |
| Guilherme Guido |  BRA |
SWI | 12 February 1987 |
| Viktoria Zeynep Güneş |  TUR UKR |
SWI | 19 June 1998 |
| Townley Haas | USA |
SWI | 13 December 1996 |
| Molly Hannis | USA |
SWI | 13 March 1992 |
| Mary-Sophie Harvey | CAN |
SWI | 11 August 1999 |
| Siobhán Haughey |  HKG |
SWI | 31 October 1997 |
| Femke Heemskerk | NED |
SWI | 21 September 1987 |
| Natalie Hinds | USA |
SWI | 7 December 1993 |
| Tomoe Hvas |  NOR |
SWI | 1 June 2000 |
| Lilly King | USA |
SWI | 10 February 1997 |
| Kliment Kolesnikov | NEU RUS |
SWI | 9 July 2000 |
| Vinícius Lanza | BRA |
SWI | 22 March 1997 |
| Annie Lazor | USA |
SWI | 17 August 1994 |
| Chad le Clos |  RSA |
SWI | 12 April 1992 |
| Felipe Lima | BRA |
MOP/SWI | 5 April 1985 |
| Kacper Majchrzak |  POL |
SWI | 22 September 1992 |
| Emma McKeon | AUS |
SWI | 24 May 1994 |
| Teppei Morimoto |  JPN |
SWI | 7 April 2002 |
| Ross Murdoch | GBR SCO |
SWI | 14 January 1994 |
| Ryan Murphy | USA |
SWI | 2 July 1995 |
| Katsumi Nakamura | JPN |
SWI | 21 February 1994 |
| Beata Nelson | USA |
SWI | 2 September 1998 |
| Sydney Pickrem | CAN |
SWI | 21 May 1997 |
| Benedetta Pilato |  ITA |
SWI | 18 January 2005 |
| Brett Pinfold | USA |
SWI | 22 April 1995 |
| Ben Proud | ENG GBR |
SWI | 21 September 1994 |
| Jesse Puts | NED |
SWI | 1 August 1994 |
| Justin Ress | USA |
SWI | 3 August 1997 |
| Maxime Rooney | USA |
SWI | 16 April 1998 |
| Christopher Rothbauer |  AUT |
SWI | 29 January 1998 |
| Yevgeny Rylov | RUS |
SWI | 23 September 1996 |
| Katerine Savard | CAN |
SWI | 26 May 1993 |
| Fernando Scheffer | BRA |
SWI | 6 April 1998 |
| Duncan Scott | GBR SCO |
SWI | 6 May 1997 |
| Tom Shields | USA |
SWI | 11 July 1991 |
| Anastasiya Shkurdai |  BLR NEU |
SWI | 3 January 2003 |
| Ilia Shymanovich | BLR NEU |
SWI | 2 August 1994 |
| Sarah Sjöström |  SWE |
SWI | 17 August 1993 |
| Olivia Smoliga | USA |
SWI | 12 October 1994 |
| Coleman Stewart | USA |
SWI | 3 March 1998 |
| Charlie Swanson | USA |
SWI | 20 February 1998 |
| Fanny Teijonsalo |  FIN |
SWI | 6 February 1996 |
| Maaike de Waard | NED |
SWI | 11 October 1996 |
| Marie Wattel |  FRA |
SWI | 2 June 1997 |
| Abbey Weitzeil | USA |
SWI | 3 December 1996 |
| Brodie Williams | ENG GBR |
SWI | 18 March 1999 |
| Ingrid Wilm | CAN |
SWI | 8 June 1998 |
| Madi Wilson | AUS |
SWI | 31 May 1994 |
| Kelsi Worrell | USA |
SWI | 15 July 1994 |
| Kregor Zirk |  EST |
SWI | 3 July 1999 |