| Link | Location |
|---|
 | Michael O'Donnell | Dublin, Irlanda |
| Michael O'Meara | Minneapolis, Minnesota, Stati Uniti |
| Adis O'Neill | Mirimar, Florida, Stati Uniti |
| Anthony O'Neill | Dublin, Irlanda |
| Samantha O'Neill | Swindon, Regno Unito |
| Conor O'Reilly | Dublin, Irlanda |
| Colm O'Shea | Galway, Irlanda |
| Conor O'Sullivan | Dublin/London, Irlanda |
| John O’Brien | Boston, Massachusetts, Stati Uniti |
| Sagar Oak | Munich, Germania |
| Haruka Oba | Tokyo, Giappone |
| Florian Obermayer | Munich, Germania |
| Chris Oberndorfer | Duvall, Washington, Stati Uniti |
| DMITRIY OBREZKOV | Moscow, Russia |
 | Samuel Obuch | Brno, Cechia |
