Competitors for 2021 International Swimming League (ISL)
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Javier Acevedo |  CAN |
SWI | 28 January 1998 |
| Minna Atherton |  AUS |
SWI | 17 May 2000 |
| Alia Atkinson |  JAM |
SWI | 11 December 1988 |
| Madeline Banic |  USA |
SWI | 15 April 1997 |
| Ilaria Bianchi |  ITA |
SWI | 6 January 1990 |
| 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 |
| Imogen Clark |  ENG GBR |
SWI | 1 June 1999 |
| Mallory Comerford | USA |
SWI | 6 September 1997 |
| Breno Correia |  BRA |
SWI | 19 February 1999 |
| Catie DeLoof | USA |
SWI | 12 February 1997 |
| Christian Diener |  GER |
SWI | 3 June 1993 |
| Valentine Dumont |  BEL |
SWI | 2 July 2000 |
| Sara Franceschi | ITA |
SWI | 1 February 1999 |
| Leah Gingrich | USA |
OWS/SWI | 12 February 1990 |
| Anastasia Gorbenko |  ISR |
SWI | 7 August 2003 |
| Luke Greenbank | ENG GBR |
SWI | 17 September 1997 |
| Guilherme Guido | BRA |
SWI | 12 February 1987 |
| Mary-Sophie Harvey | CAN |
SWI | 11 August 1999 |
| Siobhán Haughey |  HKG |
SWI | 31 October 1997 |
| Femke Heemskerk |  NED |
SWI | 21 September 1987 |
| Ryan Held | USA |
SWI | 27 June 1995 |
| Tomoe Hvas |  NOR |
SWI | 1 June 2000 |
| Chihiro Igarashi |  JPN |
SWI | 24 May 1995 |
| Takeshi Kawamoto | JPN |
SWI | 19 February 1995 |
| Kliment Kolesnikov | NEU RUS |
SWI | 9 July 2000 |
| Yasuhiro Koseki | JPN |
SWI | 14 March 1992 |
| 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 |
| Keanna MacInnes | GBR SCO |
SWI | 19 August 2001 |
| Paige Madden | USA |
SWI | 22 October 1998 |
| Martin Malyutin | RUS |
SWI | 5 July 1999 |
| Florent Manaudou |  FRA |
SWI | 12 November 1990 |
| Emma McKeon | AUS |
SWI | 24 May 1994 |
| Julie Meynen |  LUX |
SWI | 15 August 1997 |
| Edward Mildred | ENG GBR |
SWI | 10 April 2003 |
| Vladimir Morozov | NEU RUS |
SWI | 16 June 1992 |
| Ross Murdoch | GBR SCO |
SWI | 14 January 1994 |
| Andi Murez | ISR USA |
SWI | 29 January 1992 |
| Katsumi Nakamura | JPN |
SWI | 21 February 1994 |
| Nándor Németh |  HUN |
SWI | 19 November 1999 |
| Anna Ntountounaki | GRE |
SWI | 9 September 1995 |
| Yui Ohashi | JPN |
SWI | 18 October 1995 |
| Sydney Pickrem | CAN |
SWI | 21 May 1997 |
| Benedetta Pilato | ITA |
SWI | 18 January 2005 |
| Brett Pinfold | USA |
SWI | 22 April 1995 |
| Alessandro Pinzuti | ITA |
SWI | 10 May 1999 |
| Ben Proud | ENG GBR |
SWI | 21 September 1994 |
| Maxime Rooney | USA |
SWI | 16 April 1998 |
| Christopher Rothbauer |  AUT |
SWI | 29 January 1998 |
| Yevgeny Rylov | RUS |
SWI | 23 September 1996 |
| Fernando Scheffer | BRA |
SWI | 6 April 1998 |
| Duncan Scott | GBR SCO |
SWI | 6 May 1997 |
| Daiya Seto | JPN |
SWI | 24 May 1994 |
| Katie Shanahan | GBR SCO |
SWI | 25 June 2004 |
| 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 |
| Grigory Tarasevich | RUS |
SWI | 1 August 1995 |
| Fanny Teijonsalo |  FIN |
SWI | 6 February 1996 |
| Kira Toussaint | NED |
SWI | 22 May 1994 |
| Kanako Watanabe | JPN |
SWI | 15 November 1996 |
| Marie Wattel | FRA |
SWI | 2 June 1997 |
| Abbey Weitzeil | USA |
SWI | 3 December 1996 |
| Ingrid Wilm | CAN |
SWI | 8 June 1998 |