Stadia
Alphabetical: O
club|country|stadium|capacity
| Odense Boldklub | DEN | Fionia Park | 15761 | |
| OFI Kriti | GRE | Pankritio Stadium | 26400 | GM |
| Oldham Athletic | ENG | Boundary Park | 13624 | GM |
| Olympiakos Piraeus | GRE | Yorgos Karaiskakis | 33300 | GM |
| Olympique Lyonnais | FRA | Municipal de Gerland | 41200 | GM |
| Olympique Marseille | FRA | Velodrome | 60031 | GM |
| Olympique Nice | FRA | Municipal du Ray | 17000 | GM |
| Os Belenenses | POR | Estadio do Restelo | 32500 | GM |
| Osijek | CRO | Gradski vrt | 19500 | GM |
| Oxford United | ENG | Kassam Stadium | 12500 | GM |
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