Competitors for 2021 International Swimming League (ISL)
| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Bailey Andison |  CAN |
SWI | 13 November 1997 |
| Helena Bach |  DEN |
SWI | 12 June 2000 |
| Madeline Banic |  USA |
SWI | 15 April 1997 |
| Holly Barratt |  AUS |
SWI | 1 January 1988 |
| Adam Barrett |  ENG GBR |
SWI | 30 July 1992 |
| Tatiana Belonogoff | GBR RUS |
SWI | 16 July 2001 |
| Ilya Borodin |  NEU RUS |
SWI | 14 February 2003 |
| Lisa Bratton | USA |
SWI | 5 May 1996 |
| Annika Bruhn |  GER |
SWI | 5 October 1992 |
| Martina Carraro |  ITA |
SWI | 21 June 1993 |
| Arianna Castiglioni | ITA |
SWI | 15 August 1997 |
| Thomas Ceccon | ITA |
SWI | 27 January 2001 |
| Matteo Ciampi | ITA |
SWI | 3 November 1996 |
| Tess Cieplucha | CAN |
SWI | 24 September 1998 |
| Michelle Coleman |  SWE |
SWI | 31 October 1993 |
| Tommy Cope | USA |
SWI | 11 January 1997 |
| Ali DeLoof | USA |
SWI | 14 August 1994 |
| Leonardo de Deus |  BRA |
SWI | 18 January 1991 |
| Elena Di Liddo | ITA |
SWI | 8 September 1993 |
| Joanna Evans |  BAH |
SWI | 25 July 1997 |
| Felipe França | BRA |
SWI | 14 May 1987 |
| Vladislav Grinev | NEU RUS |
SWI | 21 July 1996 |
| Viktoria Zeynep Güneş |  TUR UKR |
SWI | 19 June 1998 |
| 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 |
| Femke Heemskerk |  NED |
SWI | 21 September 1987 |
| Ryan Hoffer | USA |
SWI | 9 July 1998 |
| Anna Hopkin | ENG GBR |
SWI | 24 April 1996 |
| Zsu Jakabos |  HUN |
SWI | 3 April 1989 |
| Chase Kalisz | USA |
SWI | 7 March 1994 |
| Mariya Kameneva | NEU RUS |
SWI | 27 May 1999 |
| Arno Kamminga | NED |
SWI | 22 October 1995 |
| Kliment Kolesnikov | NEU RUS |
SWI | 9 July 2000 |
| Luc Kroon | NED |
SWI | 30 August 2001 |
| Max Litchfield | ENG GBR |
SWI | 4 March 1995 |
| Jay Litherland | USA |
SWI | 24 August 1995 |
| Linnea Mack | USA |
SWI | 27 November 1995 |
| 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 |
| Clément Mignon |  FRA |
SWI | 21 January 1993 |
| Alessandro Miressi | ITA |
SWI | 2 October 1998 |
| Lidón Muñoz |  ESP |
SWI | 3 December 1995 |
| Camden Murphy | USA |
SWI | 6 April 1999 |
| Mark Nikolayev | RUS |
SWI | 30 July 1997 |
| Federica Pellegrini | ITA |
SWI | 5 August 1988 |
| Ben Proud | ENG GBR |
SWI | 21 September 1994 |
| Alberto Razzetti | ITA |
SWI | 2 June 1999 |
| Matteo Rivolta | ITA |
SWI | 16 November 1991 |
| Yevgeny Rylov | RUS |
SWI | 23 September 1996 |
| Kayla Sanchez | CAN PHI |
SWI | 7 April 2001 |
| Fabio Scozzoli | ITA |
SWI | 3 August 1988 |
| Aleksandr Shchogolev | NEU RUS |
SWI | 6 April 2002 |
| Serhiy Shevtsov | UKR |
SWI | 29 June 1998 |
| Anastasiya Shkurdai |  BLR NEU |
SWI | 3 January 2003 |
| Ilia Shymanovich | BLR NEU |
SWI | 2 August 1994 |
| Sarah Sjöström | SWE |
SWI | 17 August 1993 |
| Laura Stephens | ENG GBR |
SWI | 2 June 1999 |
| Dominika Sztandera |  POL |
SWI | 19 January 1997 |
| Fanny Teijonsalo |  FIN |
SWI | 6 February 1996 |
| Mariya Temnikova | NEU RUS |
SWI | 17 November 1995 |
| Jessica Vall | ESP |
SWI | 22 November 1988 |
| Katarzyna Wilk-Wasick | POL |
SWI | 22 March 1992 |
| Lorenzo Zazzeri | ITA |
SWI | 9 August 1994 |
| Kregor Zirk |  EST |
SWI | 3 July 1999 |