| Athlete | Country | Sports | Date of birth |
|---|---|---|---|
| Yevgeniya Abdriziakova | WAP | 7 June 1988 | |
| Arif Abdul Latif | BDM | 22 August 1989 | |
| Jaouad Achab | TKW | 20 August 1992 | |
| Kieran Ackhurst | VOL | 16 January 1997 | |
| Seiya Adachi | WAP | 24 June 1995 | |
| Jakub Adamski | ATH | 11 November 1987 | |
| Dirk Adriaanse | ROW | ||
| Leonardo Affede | FEN | 26 April 1994 | |
| Laura Agard | FTB | 26 July 1989 | |
| Jason Agopian | VOL | 3 May 1993 | |
| Óscar Aguirre | VOL | 5 December 1990 | |
| Omowumi Agunbiade | BAS | 31 January 1992 | |
| Ahn Woo-Jae | VOL | 19 December 1994 | |
| Zhaniya Aidarkhanova | SHO | 24 May 1992 | |
| Docus Ajok | ATH | 12 July 1994 | |
| Rinas Akhmadeyev | ATH | 25 May 1989 | |
| Mehmet Akkoyun | ATH | 28 February 1989 | |
| Arda İnan Akyar | WAP | 22 June 1990 | |
| Berkay Akyol | TKW | 5 June 1996 | |
| Anniina Ala-Seppälä | OWS/SWI | 13 August 1993 | |
| Sebastián Albornoz | VOL | 17 June 1992 | |
| Emilija Aleksandrović | WAP | 16 December 1997 | |
| Moisés Alicastro | VOL | 9 June 1995 | |
| Bengü Alkan | TKW | ||
| Jonathan Allardon | JUD | 3 June 1991 | |
| Haley Allen | DIV | 3 June 1997 | |
| Felipe Almeida | WAP | 16 April 1996 | |
| Omid Amidi | TKW | 14 June 1992 | |
| Maedeh Aminzadeh | SHO | 8 January 1995 | |
| Javad Amiri | TKW | 27 June 1996 | |
| An Ba-Ul | JUD | 25 March 1994 | |
| An Chang-Rim | JUD | 2 March 1994 | |
| Naa Anang | ATH | 10 March 1995 | |
| Maria Anasti | DIV | 24 December 1994 | |
| Aleksandar Andrejević | WAP | ||
| Andriyan | DIV | 4 December 1994 | |
| Irina Anikina | DIV | 3 June 1997 | |
| Emilia Ankiewicz | ATH | 22 November 1990 | |
| Yevelina Anoshkina | HAN | 26 June 1994 | |
| Pavel Antipov | BAS | 19 September 1991 | |
| Miyuu Aoki | WAP | 8 July 1993 | |
| Reona Aoki | SWI | 24 February 1995 | |
| Atsushi Arai | WAP | 3 February 1994 | |
| Ikki Arai | FTB | 8 November 1993 | |
| Konatsu Arai | RGY | 1996 | |
| Midori Arai | FTB | 12 August 1993 | |
| Kenta Araki | WAP | 6 April 1995 | |
| Shota Araki | ROW | 1 May 1993 | |
| Rodolfo Aranzubia | VOL | 2 August 1988 | |
| Gabriel Araya | VOL | 6 November 1995 | |
| Anzaur Ardanov | JUD | 4 July 1991 | |
| Nina Argunova-Morozova | ATH | 15 September 1989 | |
| Elle Armit | WAP | 20 August 1991 | |
| Oliver Armstrong-Scott | DIV | 31 March 1993 | |
| Kaspar Arn | HAN | 29 May 1994 | |
| Fernando Arpajou | VOL | 8 November 1994 | |
| Vitaliy Arseniev | GYM | 23 March 1992 | |
| Sarah Asahina | JUD | 22 October 1996 | |
| Mateja Asanović | WAP | 30 October 1995 | |
| Miki Asayama | OWS | ||
| José Ascanio | VOL | 11 April 1989 | |
| Mehran Askari | TKW | 7 July 1997 | |
| Ophélie Aspord | OWS | 21 May 1991 | |
| Gustavo Assis | JUD | 4 November 1994 | |
| Stephanie Au | SWI | 30 May 1992 | |
| Gabriele Auber | DIV | 20 February 1994 | |
| Bastien Auzeil | ATH | 22 October 1989 | |
| Aleksandrs Avdejevs | VOL | 28 April 1995 | |
| Nataliya Avdeyeva | ARC | 6 September 1988 | |
| Suppanyu Avihingsanon | BDM | 24 October 1989 | |
| Darya Avtonomova | RGY | 24 April 1996 | |
| Amélie Awong | FEN | 9 June 1994 | |
| Vaslav Ayala | TKW | ||
| Furkan Asena Aydın | TKW | 12 February 1991 | |
| Rinat Ayupov | SHO | 3 May 1989 | |
| Aleksandra Babintseva | JUD | 4 February 1993 | |
| Léa Bachelier | WAP | 13 February 1993 | |
| Mathias Bachelier | WAP | 21 December 1995 | |
| Bae Jong-Beom | TKW | 15 November 1996 | |
| Baek Gye-Joong | VOL | 9 April 1994 | |
| Baek Seung-Ho | OWS/SWI | 2 March 1990 | |
| Cristopher Baeza | VOL | 21 December 1995 | |
| Donothan Bailey | GYM | 29 December 1990 | |
| Tyler Baillie | WAP | 8 June 1995 | |
| Ana Bajić | TKW | 19 March 1995 | |
| Yuliya Bakhareva-Lichagina | FEN | 7 April 1994 | |
| Andrey Balakirev | WAP | 31 March 1996 | |
| Dmitry Balandin | SWI | 4 April 1995 | |
| Fabien Ballorca | FEN | 3 March 1993 | |
| Sara Balzer | FEN | 3 April 1995 | |
| Ivan Banzeruk | ATH | 9 February 1990 | |
| Botond Barabás | WAP | 8 July 1991 | |
| Solène Barbance | FTB | 13 August 1991 | |
| Jade Barber | ATH | 4 April 1993 | |
| Arianna Barbieri | SWI | 23 February 1989 | |
| Marie Barbieux | WAP | 12 August 1991 | |
| Anastasiya Barchuk | VOL | 9 February 1996 | |
| Paval Bareysha | ATH | 16 February 1991 | |
| Nikita Barinov | BAS | 21 January 1991 | |
| Matthew Barnard | DIV | 3 November 1995 | |
| Andrea Baroglio | FEN | 7 May 1987 | |
| Thomas Barr | ATH | 24 July 1992 | |
| Crauler Barra | VOL | 15 April 1988 | |
| Holly Barratt | SWI | 1 January 1988 | |
| Julia Barton | WAP | 13 June 1996 | |
| Rosa Bas | ROW | 1 January 1991 | |
| Davor Basarić | HAN | 3 November 1990 | |
| Anna Başta | FEN | 10 July 1996 | |
| Bence Bátori | WAP | 28 December 1991 | |
| Brian Baudouin | SHO | 10 June 1994 | |
| Tobias Baumgartner | HAN | 20 February 1991 | |
| Simona Baumrtová-Kubová | SWI | 24 August 1991 | |
| Karolis Bauža | JUD | 24 April 1987 | |
| Fabio Baviera | HAN | 7 March 1992 | |
| Anastasiya Bavykina | VOL | 6 July 1992 | |
| Tristin Baxter | OWS | 6 March 1992 | |
| Yelizaveta Bazarova | SWI | 28 November 1995 | |
| Galsan Bazarzhapov | ARC | 1 November 1994 | |
| Nadja Bazynski | JUD | 25 May 1993 | |
| Christina Bechtel | SWI | 24 June 1993 | |
| Yekaterina Begoulova | SHO | 4 December 1992 | |
| Andrea Bekić | JUD | 18 October 1991 | |
| Benjamin Bell | VOL | 24 February 1990 | |
| Marco Belotti | SWI | 29 November 1988 | |
| Ramiro Benítez | VOL | 18 July 1992 | |
| Craig Benson | SWI | 30 April 1994 | |
| Francesco Bergamini | FTB | 5 November 1994 | |
| Madison Berggren | WAP | 2 December 1996 | |
| Annemarie Bernhard | ROW | 8 July 1992 | |
| Filippo Berra | FTB | 6 February 1995 | |
| Joep van den Bersselaar | WAP | 2 June 1993 | |
| Dániel Berta | FEN | 30 March 1994 | |
| Miķelis Bērziņš | VOL | 9 August 1990 | |
| Yuliya Bessolova | FTB | 23 August 1992 | |
| Tommaso Biasci | FTB | 10 November 1994 | |
| Lina Bikulova-Kalutskaya | ATH | 1 October 1988 | |
| Niyaz Bilalov | JUD | 5 September 1994 | |
| Andreas Billi | DIV | 11 July 1990 | |
| Laura Bilotta | DIV | 9 March 1996 | |
| Tobia Biondo | FEN | 16 May 1989 | |
| Robyn Birch | DIV | 10 January 1994 | |
| Dane Bird-Smith | ATH | 15 July 1992 | |
| Katarina Biserčić | SHO | 9 September 1992 | |
| Iso Bishop | WAP | 8 September 1991 | |
| Dávid Bisztritsányi | WAP | 7 June 1987 | |
| Berk Bıyık | WAP | 1 January 1993 | |
| Luis Blanco | VOL | 5 March 1991 | |
| Quentin Blary | WAP | 1993 | |
| Karina Blynskaya | FTB | 5 May 1993 | |
| Samuel Boehm | VOL | 4 March 1988 | |
| Dmytro Bohdan | VOL | 5 July 1989 | |
| Anna Bomboyeva-Balsukova | ARC | 2 June 1992 | |
| Aleksandr Bondar | SHO | 2 May 1988 | |
| Anton Bondarenko | ROW | 12 September 1992 | |
| Leonel Bonón | ATH | 13 December 1993 | |
| Rachel Bootsma | SWI | 15 December 1993 | |
| Yannick Borel | FEN | 5 November 1988 | |
| Wouter Borghs | ROW | ||
| Jaime Bories | VOL | 23 May 1989 | |
| Matteo Borsini | ROW | 19 April 1994 | |
| Goitsemodimo Bothobutle | ATH | 1991 | |
| Yuranan Boudang | VOL | 20 December 1987 | |
| Béline Boulay | FEN | 13 September 1992 | |
| Sonia Bouloukbachi | WAP | 10 January 1996 | |
| Laura Bourgoin | FTB | 17 September 1992 | |
| Elisabeth Boyer | ATH | 23 September 1992 | |
| Rui Bragança | TKW | 26 December 1991 | |
| Carlton Bragg | BAS | 14 December 1995 | |
| Lazar Brakočević | WAP | 1996 | |
| Irvandeep Brar | VOL | 24 April 1995 | |
| Namanveer Brar | SHO | 14 June 1993 | |
| Hans-Georg Brase | BAS | 15 September 1993 | |
| Lisa Bratton | SWI | 5 May 1996 | |
| Dmitry Brayko | SHO | 17 April 1987 | |
| David Brembly | BAS | 19 March 1993 | |
| Arianna Bridi | OWS | 6 November 1995 | |
| Kevin Bright | BAS | 7 September 1992 | |
| Sofya Brodatskaya | ATH | 4 October 1995 | |
| Nicholas Brooks | WAP | 12 October 1995 | |
| Benjamin Brossier | TTN | 20 January 1994 | |
| Alexander Brown | ROW | ||
| Kemarley Brown | ATH | 20 July 1992 | |
| Nic Brown | SWI | 8 March 1996 | |
| Jost Brücker | HAN | 17 February 1991 | |
| Lorenzo Bruni | WAP | 8 April 1994 | |
| Lorenzo Bruttini | FEN | 14 November 1991 | |
| Christopher Bryan | OWS | 8 May 1990 | |
| Robert Bryliński | ATH | 2 April 1991 | |
| Matúš Bubeník | ATH | 14 November 1989 | |
| Aleksandr Bulanov | ATH | 26 December 1989 | |
| Adut Bulgak | BAS | 20 December 1992 | |
| Porntip Buranaprasertsuk | BDM | 24 October 1991 | |
| Mikhail Burchalin | SHO | 25 June 1993 | |
| Jelena Bursać | HAN | 8 November 1988 | |
| Camille Buscomb-French | ATH | 11 July 1990 | |
| Xiomarlys Bustamante | OWS | 29 January 1993 | |
| Burcu Büyükbezgin | ATH | 15 September 1991 | |
| Lorenzo Buzzi | FEN | 2 April 1994 | |
| Alican Çağatay | WAP | 15 October 1990 | |
| Olga Calissi | FEN | 23 March 1992 |