| Link | Location |
|---|
 | Conor O'Reilly | Dublin, Irland |
| Colm O'Shea | Galway, Irland |
| Conor O'Sullivan | Dublin/London, Irland |
| John O’Brien | Boston, Massachusetts, Vereinigte Staaten |
| Sagar Oak | Munich, Deutschland |
| Haruka Oba | Tokyo, Japan |
| Florian Obermayer | Munich, Deutschland |
| Chris Oberndorfer | Duvall, Washington, Vereinigte Staaten |
| DMITRIY OBREZKOV | Moscow, Russische Föderation |
 | Samuel Obuch | Brno, Tschechien |
| Greta Obuchaviciute | Kuwait City, Kuwait |
| Katarzyna Obuchowska | Wrocław, Polen |
| Naoki Ochiai | Tokyo, Japan |
| Marcin Ochota | Wrocław, Polen |
 | Teodora Ocokoljić | BELGRADE, Serbien |
