Sportler
| M/F | Land | Alter | Geburtstag | ||
|---|---|---|---|---|---|
| Jack O'brien | M |  | AUS | 01.03.1998 | |
| Kelland O'Brien | M | | AUS | 22.05.1998 | |
| Mollie O'Callaghan | F | | AUS | 02.04.2004 | |
| Austin Richard O'Connor | M |  | IRL | 10.12.1974 | |
| Ben O'Connor | M | | AUS | 25.11.1995 | |
| Cian O'Connor | M | | IRL | 12.11.1979 | |
| Kate O'Connor | F | | IRL | 12.12.2000 | |
| Lauren O'Connor | F |  | USA | 10.08.1998 | |
| Emma Maire O'Croinin | F |  | CAN | 22.05.2003 | |
| Christopher O'Donnell | M | | IRL | 17.05.1998 | |
| Shane O'Donoghue | M | | IRL | 24.11.1992 | |
| Paul O'Donovan | M | | IRL | 19.04.1994 | |
| Jade O'Dowda | F |  | GBR | 09.09.1999 | |
| Fiona O'Keeffe | F | | USA | 24.05.1998 | |
| Connor O'Leary | M |  | JPN | 12.10.1993 | |
| Shane O'Neill | M | | AUS | 03.01.1990 | |
| Aoife O'Rourke | F | | IRL | 02.07.1997 | |
| Christian O'Sullivan | M |  | NOR | 22.08.1991 | |
| Sophie O'Sullivan | F | | IRL | 23.12.2001 | |
| Nicolae Oanta | M |  | ROU | 14.08.1990 | |
| Yuta Obara | M | | JPN | 29.02.1996 | |
| Michael Obasuyi | M |  | BEL | 12.08.1999 | |
| Dallas Oberholzer | M |  | RSA | 27.06.1975 | |
| Alex Obert | M | | USA | 18.12.1991 | |
| Ernest John Obiena | M |  | PHI | 17.11.1995 | |
| Hellen Obiri | F |  | KEN | 13.12.1989 | |
| Blessing Oborududu | F |  | NGA | 12.03.1989 | |
| Andreas Obst | M |  | GER | 13.07.1996 | |
| Marie-Therese Obst | F | | NOR | 07.01.1996 | |
| Miguel Ángel Oca Gaia | M |  | ESP | 15.04.1970 | |
| Daiana Ocampo | F |  | ARG | 16.02.1991 | |
| Oleh Andriiovych Ocheretko | M |  | UKR | 25.05.2003 | |
| Manuel Ochoa | M | | ESP | 21.12.1998 | |
| Prestina Oluchi Ochonogor | F | | NGA | 03.07.2006 | |
| Eddie Ockenden | M | | AUS | 03.04.1987 | |
| Rezza Octavia | F |  | IDN | 25.10.2000 | |
| Makoto Odakura | M | | JPN | 20.07.1993 | |
| Alisher Odilov | M |  | UZB | 15.07.2001 | |
| Lilian Odira | F | | KEN | 18.04.1999 | |
| Tsetsentsengel Odkhuu | M |  | MGL | 18.10.1999 | |
| Jayhan Odlum-Smith | M |  | LCA | 11.01.2002 | |
| Kauldi Odriozola Yeregui | M | | ESP | 07.01.1997 | |
| Sophie Oestergaard | F |  | DEN | 11.11.1999 | |
| Elena Oetling | F |  | MEX | 18.04.1993 | |
| Saskia Oettinghaus | F | | GER | 03.04.1998 | |
| Tinka Eline Offereins | F |  | NED | 05.10.1993 | |
| Favour Ofili | F | | NGA | 31.12.2002 | |
| Sebastian Ofner | M |  | AUT | 12.05.1996 | |
| Stine Bredal Oftedal | F | | NOR | 25.09.1991 | |
| Alexander Ogando | M |  | DOM | 03.05.2000 | |
| Alina Oganesyan | F | | GER | 13.06.2004 | |
| Daiki Ogawa | M | | JPN | 17.04.2003 | |
| Rika Ogawa | F | | JPN | 28.07.1994 | |
| Samuel Ogazi | M | | NGA | 14.05.2006 | |
| Chiaka Ogbogu | F | | USA | 15.04.1995 | |
| Joy Ogbonne Eze | F | | NGA | 06.06.2004 | |
| Fidan Ogel | F |  | TUR | 17.01.2002 | |
| Godson Oke Oghenebrume | M | | NGA | 27.05.2003 | |
| Daichi Ogihara | M | | JPN | 17.03.2003 | |
| Flynn Ogilvie | M | | AUS | 17.09.1993 | |
| Maja Ognjenović | F |  | SRB | 06.08.1984 | |
| Berkay Ömer Öğretir | M | | TUR | 16.02.1998 | |
| Nikola Ogrodníková | F |  | CZE | 18.08.1990 | |
| Yemisi Ogunleye | F | | GER | 03.10.1998 | |
| Omolara Ogunmakinju | F | | NGA | 25.05.1993 | |
| Christianah Tolulope Ogunsanya | F | | NGA | 12.01.2002 | |
| Cynthia Temitayo Ogunsemilore | F | | NGA | 14.05.2002 | |
| Sanguk Oh | M |  | KOR | 30.09.1996 | |
| Ye Jin Oh | F | | KOR | 10.05.2005 | |
| Yeonji Oh | F | | KOR | 04.08.1990 | |
| Yui Ohashi | F | | JPN | 18.10.1995 | |
| Ayumu Ohata | M | | JPN | 27.04.2001 | |
| Shu Ohba | F | | JPN | 11.07.2002 | |
| Aya Ohori | F | | JPN | 02.10.1996 | |
| Isak Öhrström | M |  | SWE | 26.11.1990 | |
| Riyu Ohta | F | | JPN | 17.08.1994 | |
| Mei Ohtani | F | | JPN | 28.05.2000 | |
| Victoria Ohuruogu | F | | GBR | 28.02.1993 | |
| Janek Öiglane | M |  | EST | 25.04.1994 | |
| Oihane Hernández Zurbano | F | | ESP | 04.05.2000 | |
| Shihori Oikawa | F | | JPN | 12.03.1989 | |
| Ayami Oishi | F | | JPN | 09.04.1991 | |
| Go Oiwa | M | | JPN | 23.06.1972 | |
| Yoshiaki Oiwa | M | | JPN | 19.07.1976 | |
| Ifeanyi Emmanuel Ojeli | M | | NGA | 10.10.1998 | |
| Tade Ojora | M | | GBR | 14.10.1999 | |
| Chrisant Ojwang | M | | KEN | 15.12.1998 | |
| Shinnosuke Oka | M | | JPN | 31.10.2003 | |
| Keiju Okada | M | | JPN | 02.12.1995 | |
| Kumiko Okada | F | | JPN | 17.10.1991 | |
| Naoya Okada | M | | JPN | 10.10.1990 | |
| Daisuke Okamoto | M | | JPN | 29.03.1995 | |
| Mana Okamura | F | | JPN | 28.05.2005 | |
| Eva Okaro | F | | GBR | 10.11.2006 | |
| Keigo Okawa | M | | JPN | 11.03.1990 | |
| Haruka Okazaki | F | | JPN | 03.07.1998 | |
| Sewonrets Quincy Mensah Okazawa | M | | JPN | 21.12.1995 | |
| Chidinma Nkeruka Okeke | F | | NGA | 11.08.2000 | |
| Seraphine Okemba | F |  | FRA | 03.12.1995 | |
| John Okeyo | M | | KEN | 28.04.2000 | |
| Chidi Anthony Okezie | M | | NGA | 08.08.1993 | |
| Patrick Odongo Okong'o | M | | KEN | 20.03.2000 | |
| Amy Nnenna Okonkwo | F | | NGA | 26.08.1996 | |
| Ifunanya Okoro | F | | NGA | 06.07.1999 | |
| Georgii Okorokov | M | | AUS | 14.12.1996 | |
| Ijeoma Esther Okoronkwo | F | | NGA | 27.03.1997 | |
| Lawrence Okoye | M | | GBR | 06.10.1991 | |
| Yu Okudaira | M | | JPN | 26.05.1999 | |
| Olayinka Olajide | F | | NGA | 28.10.2002 | |
| Olaitan Adam Olaore | M | | NGA | 07.03.2002 | |
| Maria Olarasu | F |  | MDA | 28.05.2000 | |
| Dan Olaru | M | | MDA | 11.11.1996 | |
| Oyesade Olatoye | F | | NGA | 25.01.1997 | |
| Benjamin Craig Old | M |  | NZL | 13.08.2002 | |
| Keet Oldenbeuving | F | | NED | 01.09.2004 | |
| Marloes Oldenburg | F | | NED | 09.03.1988 | |
| Cian Oldknow | F | | RSA | 17.09.1996 | |
| Penelope Oleksiak | F | | CAN | 13.06.2000 | |
| Jacob Thorbjørn Olesen | M | | DEN | 21.12.1989 | |
| Peeter Olesk | M | | EST | 22.04.1993 | |
| Mahdi Olfati | M |  | IRN | 06.03.2001 | |
| Olga Carmona García | F | | ESP | 12.06.2000 | |
| Orlann Oliere | F | | FRA | 26.05.1991 | |
| Andrej Olijnik | M |  | LTU | 16.10.1987 | |
| Leandra Olinga-Andela | F | | FRA | 12.08.1997 | |
| Michael Akpovie Olise | M | | FRA | 12.12.2001 | |
| Ingrid Oliveira | F |  | BRA | 07.05.1996 | |
| Lorrane dos Santos Oliveira | F | | BRA | 13.04.1998 | |
| Luiz Gabriel Oliveira | M | | BRA | 24.01.2001 | |
| Nelson Filipe Santos Simoes Oliveira | M |  | POR | 06.03.1989 | |
| Rui Felipe Alves Oliveira | M | | POR | 05.09.1996 | |
| Vitória Oliveira | F | | POR | 30.08.1992 | |
| Eduardo Oliveira De Moraes | M | | BRA | 02.07.2001 | |
| Mayan Oliver | F | | MEX | 11.07.1993 | |
| Esti Olivier | F | | RSA | 10.12.1992 | |
| Ethan Olivier | M | | NZL | 07.08.2005 | |
| Marc-Antoine Olivier | M | | FRA | 18.06.1996 | |
| Ljudmyla Oljanowska | F | | UKR | 20.02.1993 | |
| Alena Olsen | F | | USA | 06.12.1995 | |
| Laerke Olsen | F | | DEN | 21.06.1998 | |
| Shallon Jade Olsen | F | | CAN | 10.07.2000 | |
| Evan Olson | M | | USA | 27.07.1997 | |
| Josefin Olsson | F | | SWE | 23.08.1989 | |
| Sebastian Stefan Oltean | M | | ROU | 03.01.2001 | |
| Bekmurod Oltiboev | M | | UZB | 17.06.1996 | |
| Tochukwu Oluehi | F | | NGA | 02.05.1987 | |
| Veronica Oluoch Adhiambo | F | | KEN | 05.06.1999 | |
| Osmar Olvera Ibarra | M | | MEX | 05.06.2004 | |
| Kelly Tyler Olynyk | M | | CAN | 19.04.1991 | |
| Nicola Olyslagers | F | | AUS | 28.12.1996 | |
| Eugene Omalla | M | | NED | 05.10.2000 | |
| Ferdinand Omanyala | M | | KEN | 02.01.1996 | |
| Ahmed Omar | M |  | EGY | ||
| Yahia Khaled Mahmoud Fathy Omar | M | | EGY | 09.09.1997 | |
| José Omar de la Cruz Mangas | M | | DOM | 26.08.2001 | |
| Artur Omarov | M | | CZE | 13.08.1988 | |
| Elizabeth Omoregie | F |  | SLO | 29.12.1996 | |
| Loveth Oghosasere Omoruyi | F |  | ITA | 25.08.2002 | |
| Nuni Omot | M |  | SSD | 03.10.1994 | |
| Olajide Omotayo | M | | NGA | 06.07.1995 | |
| Sakurako Omoto | F | | JPN | 19.03.1998 | |
| Ona Batlle Pascual | F | | ESP | 10.06.1999 | |
| Nelson Onana | M | | BEL | 01.03.2000 | |
| Ahmet Önder | M | | TUR | 12.07.1996 | |
| Oriane Onacia Ondono | F | | FRA | 14.04.1996 | |
| Adam Ondra | M | | CZE | 05.02.1993 | |
| Imke Onnen | F | | GER | 17.08.1994 | |
| Hiroto Ono | M | | JPN | 03.12.2004 | |
| Shohei Ono | M | | JPN | 03.02.1992 | |
| Ginwoo Onodera | M | | JPN | 15.02.2010 | |
| Taishi Onodera | M | | JPN | 27.02.1996 | |
| Taisiia Onofriichuk | F | | UKR | 28.05.2008 | |
| Ella Onojuvwevwo | F | | NGA | 25.03.2005 | |
| Steve Onosai Rimoni | M |  | SAM | 19.09.2001 | |
| Ifeoma Chukwufumnay Onumonu | F | | NGA | 25.02.1994 | |
| Udodi Chudi Onwuzurike | M | | NGA | 29.01.2003 | |
| Vincent Onyala | M | | KEN | 10.12.1996 | |
| Chioma Onyekwere | F | | NGA | 28.06.1994 | |
| Toru Onzuka | M | | JPN | 05.06.1979 | |
| Emma Oosterwegel | F | | NED | 29.06.1998 | |
| Ryan Oosthuizen | M | | RSA | 22.05.1995 | |
| Don Opeloge | M | | SAM | 13.05.1999 | |
| Motu Opetai | M | | SAM | 20.06.2001 | |
| Anuoluwapo Juwon Opeyori | M | | NGA | 01.06.1997 | |
| Stefano Oppo | M | | ITA | 12.09.1994 | |
| Soren Opti | M |  | SUR | 16.05.1997 | |
| Aibek Oralbay | M |  | KAZ | 11.06.2000 | |
| Nurbek Oralbay | M | | KAZ | 11.06.2000 | |
| Sarah Orban | F | | CAN | ||
| Richard André Ordemann | M | | NOR | 06.08.1994 | |
| Hatice Gizem Örge | F | | TUR | 26.04.1993 | |
| Delicious Orie | M | | GBR | 31.05.1997 | |
| Keturah Orji | F | | USA | 05.03.1996 | |
| Angie Orjuela | F |  | COL | 09.05.1989 | |
| Marcus Orlob | M | | USA | ||
| Tarsis Gracious Orogot | M |  | UGA | 24.11.2002 | |
| Alejandra Orozco Loza | F | | MEX | 19.04.1997 | |
| Alessia Orro | F | | ITA | 18.07.1998 | |
| Riccardo Orsoni | M | | ITA | 20.01.2000 | |
| Luis Alberto Orta Sanchez | M |  | CUB | 22.08.1994 | |
| Alejandra Ortega | F | | MEX | 08.07.1994 | |
| Antonio Carlos Ortega | M | | JPN | 14.07.1971 | |
| Mauricio Ortega | M | | COL | 04.08.1994 | |
| Cristian David Ortega Fontalvo | M | | COL | 20.09.2000 | |
| Alondra Ortiz | F |  | CRC | 18.08.2002 | |
| Beatriz Ortiz Muñoz | F | | ESP | 21.06.1995 | |
| Carlos Ortiz | M | | MEX | 24.04.1991 | |
| Chris Ortiz | M |  | PUR | 02.04.1993 | |
| Citlalli Vanessa Ortiz | F | | MEX | 19.01.2000 | |
| Idalys Ortíz | F | | CUB | 27.09.1989 | |
| Mariona Ortiz | F | | ESP | 28.02.1992 | |
| Ricardo Ortiz | M | | MEX | 07.02.1995 | |
| Silvia Ortiz | F |  | ECU | 30.06.1992 | |
| Selin Oruz | F | | GER | 05.02.1997 | |
| Assem Orynbay | F | | KAZ | 07.09.1993 | |
| Matías Osadczuk | M | | ARG | 22.04.1997 | |
| Naomi Ōsaka | F | | JPN | 16.10.1997 | |
| Suguru Osako | M | | JPN | 23.05.1991 | |
| Daisy Osakue | F | | ITA | 16.01.1996 | |
| Óscar Ureña Garcia | M | | DOM | 31.05.2003 | |
| Felix Oschmautz | M | | AUT | 18.07.1999 | |
| Ochumba Oseke Lubandji | F |  | ZAM | 01.07.2002 | |
| Asisat Lamina Oshoala | F | | NGA | 09.10.1994 | |
| Ohale Osinachi Marvis | F | | NGA | 21.12.1991 | |
| Svetlana Osipova | F | | UZB | 03.05.2000 | |
| Adil Osmanov | M | | MDA | 02.07.2000 | |
| Maria Camila Osorio Serrano | F | | COL | 22.12.2001 | |
| Honey Osrin | F | | GBR | 24.02.2003 | |
| Jeļena Ostapenko | F |  | LAT | 08.06.1997 | |
| Morgane Osyssek-Reimer | F | | FRA | 15.12.2002 | |
| Kaiya Ota | M | | JPN | 27.07.1999 | |
| Tomoki Ota | M | | JPN | 17.10.1997 | |
| Rhema Otabor | F |  | BAH | 03.12.2002 | |
| Nicolás Hernán Gonzalo Otamendi | M | | ARG | 12.02.1988 | |
| Marie Oteiza | F | | FRA | 30.01.1994 | |
| Matias Otero | M |  | URU | 14.02.1998 | |
| Munkhtsetseg Otgon | F | | MGL | 16.03.1988 | |
| Khuslen Otgonbayar | F | | MGL | 26.10.2004 | |
| Tatsunori Otsuka | M | | JPN | 06.11.2000 | |
| Joris Otten | M | | NED | 01.12.1997 | |
| Payton Otterdahl | M | | USA | 02.04.1996 | |
| Beauty Akinaere Otuedo | F | | NGA | 10.10.1997 | |
| Xuan Yi Ou | M |  | CHN | 23.01.1994 | |
| Yushan Ou | F | | CHN | 13.01.2004 | |
| Zixia Ou | F | | CHN | 24.09.1995 | |
| Abd Elkrim Ouakali | M |  | ALG | 19.03.1993 | |
| Abdessamad Oukhelfen | M | | ESP | 18.12.1998 | |
| Naby Youssouf Oularé | M |  | GUI | 06.08.2002 | |
| Sofiane Oumiha | M | | FRA | 23.12.1994 | |
| Mouhcin Outalha | M |  | MAR | 15.12.1998 | |
| Vanessa Hazel Ouwehand | F | | NZL | 30.12.1999 | |
| Sara Ouzande | F | | ESP | 11.08.1996 | |
| Dimitrij Ovtcharov | M | | GER | 02.09.1988 | |
| Ayden Owens-Delerme | M | | PUR | 28.05.2000 | |
| Pamella Adhiambo Owino | F | | KEN | 26.09.2001 | |
| Esraa Owis | F | | EGY | 15.10.1997 | |
| Lily Isabelle Owsley | F | | GBR | 10.12.1994 | |
| Aaron Ghebre Owusu | M |  | ERI | 13.10.2006 | |
| Yesugen Oyunbat | F | | MGL | 20.06.1999 | |
| Esugen Oyuntsetseg | F | | MGL | 09.01.2001 | |
| Nonoka Ozaki | F | | JPN | 23.03.2003 | |
| Seri Ozaki | F | | JPN | 22.09.2002 | |
| Szofi Ozbas | F |  | HUN | 19.10.2001 | |
| Cansu Özbay | F | | TUR | 17.10.1996 | |
| Elis Özbay | F | | TUR | 24.07.2001 | |
| Muhammed Furkan Özbek | M | | TUR | 24.01.2001 | |
| Kaan Kigen Özbilen | M | | TUR | 15.01.1986 | |
| Ela Naz Özdemir | F | | TUR | 23.04.2006 | |
| Gizem Ozer | M | | TUR | 09.04.2001 | |
| Kayhan Ozer | M | | TUR | 11.06.1998 | |
| Alisa Ozhogina Ozhogin | F | | ESP | 31.10.2000 | |
| İlke Özyüksel | F | | TUR | 26.02.1997 | |
| Hedda Øritsland | F | | NOR | 08.01.1999 | |
| Petter Øverby | M | | NOR | 26.03.1992 | |
| Sander Andreassen Øverjordet | M | | NOR | 08.04.1996 |