| Name | Cohort | Country |
|---|---|---|
| O'Brien Pádraig D |
UK | |
| O'Byrne Sharon D |
Ireland | |
| O'Connor Anthony | UK | |
| O'Connor Ian | Hong Kong | |
| O'Connor Liam | UK | |
| O'Donnell Gerard | UK | |
| O'Driscoll Rowan | UK | |
| O'Duffy Cian D |
UK | |
| O'Gara Rory | UK | |
| O'Keeffe Diego | Brazil | |
| O'Neill Shane | UK | |
| O'Rourke Conor W |
Belgium | |
| O'Shea Daniel | UK | |
| O'Shea Liam | UK | |
| Obembe Daniel | UK | |
| Obi-Wilson Dr Juliana | USA | |
| Ocelewicz Lucasz | UK | |
| Odegaard Mette FC |
Denmark | |
| Odemann Kim Daniel | Netherlands | |
| Oderda Gianluca | Italy | |
| Odia Oghenevwede | UK | |
| Odogwu Kingsley Chilobe | UK | |
| Odozi Isioma Toyin | UK | |
| Odum Nnamdi | United Kingdom | |
| Oduro-Kwarteng Baffour | Ghana | |
| Oestringer Kevin | Germany | |
| Oeuvray Rodrigue | Switzerland | |
| Oglouzdine Serguei | USA | |
| Oh Kyungmi | UK | |
| Oh Siew Wei | Malaysia | |
| Ohma Eirik Forsell | UK | |
| Ohtsuka Nobuo | Japan | |
| Oie Mika D |
USA | |
| Oikonomitsios Vasileios | UK | |
| Oikonomou-Mpegetis Sotirios | UK | |
| Ojha Abhishek | USA | |
| Ojha Satyapriya D |
USA | |
| Okaeme Nnamdi Anthony D |
UK | |
| Okci Ayşegül Dilara | UK | |
| Okoli Ikenna | Guernsey |
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