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 |
| Alia Atkinson |  JAM |
SWI | 11 December 1988 |
| Kathleen Baker |  USA |
SWI | 28 February 1997 |
| Holly Barratt |  AUS |
SWI | 1 January 1988 |
| Ilaria Bianchi |  ITA |
SWI | 6 January 1990 |
| Ilya Borodin |  NEU RUS |
SWI | 14 February 2003 |
| Lisa Bratton | USA |
SWI | 5 May 1996 |
| Martina Carraro | ITA |
SWI | 21 June 1993 |
| Dylan Carter |  TTO |
SWI | 30 January 1996 |
| Thomas Ceccon | ITA |
SWI | 27 January 2001 |
| Kyle Chalmers | AUS |
SWI | 25 June 1998 |
| Apostolos Christou |  GRE |
SWI | 1 November 1996 |
| Matteo Ciampi | ITA |
SWI | 3 November 1996 |
| Tess Cieplucha | CAN |
SWI | 24 September 1998 |
| Imogen Clark | ENG GBR |
SWI | 1 June 1999 |
| Michelle Coleman |  SWE |
SWI | 31 October 1993 |
| Breno Correia |  BRA |
SWI | 19 February 1999 |
| Elena Di Liddo | ITA |
SWI | 8 September 1993 |
| Silvia Di Pietro | ITA |
SWI | 6 April 1993 |
| Christian Diener |  GER |
SWI | 3 June 1993 |
| Valentine Dumont |  BEL |
SWI | 2 July 2000 |
| Béryl Gastaldello |  FRA |
SWI | 16 February 1995 |
| Kristian Gkolomeev | GRE |
SWI | 4 July 1993 |
| Anastasia Gorbenko |  ISR |
SWI | 7 August 2003 |
| Luke Greenbank | ENG GBR |
SWI | 17 September 1997 |
| Vladislav Grinev | NEU RUS |
SWI | 21 July 1996 |
| Guilherme Guido | BRA |
SWI | 12 February 1987 |
| Louise Hansson | SWE |
SWI | 24 November 1996 |
| Brent Hayden | CAN |
SWI | 21 October 1983 |
| Zac Incerti | AUS |
SWI | 13 July 1996 |
| Mariya Kameneva | NEU RUS |
SWI | 27 May 1999 |
| Arno Kamminga |  NED |
SWI | 22 October 1995 |
| Yuri Kisil | CAN |
SWI | 18 September 1995 |
| Luc Kroon | NED |
SWI | 30 August 2001 |
| Marius Kusch | GER |
SWI | 5 May 1993 |
| Vinícius Lanza | BRA |
SWI | 22 March 1997 |
| Annie Lazor | USA |
SWI | 17 August 1994 |
| Max Litchfield | ENG GBR |
SWI | 4 March 1995 |
| Alyssa Marsh | USA |
SWI | 8 September 1997 |
| Nicolò Martinenghi | ITA |
SWI | 1 August 1999 |
| Kylie Masse | CAN |
SWI | 18 January 1996 |
| Summer McIntosh | CAN |
SWI | 18 August 2006 |
| Anton McKee |  ISL |
SWI | 18 December 1993 |
| Emma McKeon | AUS |
SWI | 24 May 1994 |
| Alessandro Miressi | ITA |
SWI | 2 October 1998 |
| 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 |
| Anna Ntountounaki | GRE |
SWI | 9 September 1995 |
| Grigori Pekarski |  BLR NEU |
SWI | 8 January 1998 |
| Sydney Pickrem | CAN |
SWI | 21 May 1997 |
| Brett Pinfold | USA |
SWI | 22 April 1995 |
| Alberto Razzetti | ITA |
SWI | 2 June 1999 |
| Matteo Rivolta | ITA |
SWI | 16 November 1991 |
| Maxime Rooney | USA |
SWI | 16 April 1998 |
| Kayla Sanchez | CAN PHI |
SWI | 7 April 2001 |
| Fernando Scheffer | BRA |
SWI | 6 April 1998 |
| Fabian Schwingenschlögl | GER |
SWI | 15 August 1991 |
| Duncan Scott | GBR SCO |
SWI | 6 May 1997 |
| Fabio Scozzoli | ITA |
SWI | 3 August 1988 |
| Tom Shields | USA |
SWI | 11 July 1991 |
| Laura Stephens | ENG GBR |
SWI | 2 June 1999 |
| Dominika Sztandera |  POL |
SWI | 19 January 1997 |
| Kotryna Teterevkova |  LTU |
SWI | 23 January 2002 |
| Kira Toussaint | NED |
SWI | 22 May 1994 |
| Marie Wattel | FRA |
SWI | 2 June 1997 |
| Abbey Weitzeil | USA |
SWI | 3 December 1996 |
| Katarzyna Wilk-Wasick | POL |
SWI | 22 March 1992 |
| Ingrid Wilm | CAN |
SWI | 8 June 1998 |
| Madi Wilson | AUS |
SWI | 31 May 1994 |
| Lorenzo Zazzeri | ITA |
SWI | 9 August 1994 |