Calcio Squadre che iniziano con Ö
- Orleta Kielce
- Olympic Kingsway Sports Club
- Osasuna C
- Oud Heverlee Leuven II (Women)
- Olimpic Snagov
- Olympia Rajecko
- OFI (Women)
- Olimpiada Imittou (Women)
- Osterbro
- Olympique Akbou (U 21)
- OFK Backa Palanka
- Olimpic Zarnesti II
- OKS Stomil Olsztyn II
- Osijek (Women)
- Orlando Pirates U23
- Omarska
- OFK Mihajlovac
- Orca Kamogawa FC
- Omiya Ardija Ventus (W)
- Ormidias
- Oliver Mueller
- Once Lobos Chalchuapa
- Olympique Marseille Women
- Olympiacos (U 19)
- Once Lobos
- Omonia Nikosia (Women)
- OFK Petrovac U19
- Olympique Lyonnais U19 (Wom)
- ODR Petrovaradin U19
- Organica Masachapa U20
- Odds Ballklubb 2
- Odysseas Moschato (Women)
- Olympiakos Piraeus B