Calcio Squadre che iniziano con Ö
- Okocimski KS Brzesko
- Oakville Blue Devils
- OKC Energy FC (W)
- Orsomarso SC U20
- OTP (W)
- Orlando Pirates FC (Reserves)
- Oakleigh Cannons U21
- Olympic Kingsway SC U20
- Oulunsalon Pallo
- Old Bridge FC
- Olympic FC (W)
- OFK Topličanin Prokuplje
- One Knoxville SC
- OFK Dynamo Malzenice
- Orapa United FC
- Olympic FC U23
- OFK Mladost DG
- Ol Berytus (W)
- Olympiacos FC B
- Oslo FA Dakar
- Once Deportivo de Ahuachapan Reserves
- Olimpia (W)
- Operario Ferroviario EC U20
- OFK Levski 2007
- Olympique Saumur FC
- Ormeau U23
- OFC Lokomotiv Mezdra
- Olympique Saint-Quentin
- O'Higgins (Wom)
- OFK Pirin Blagoevgrad (W)
- Oddar Meanchey
- Orzel Kolno
- OSK Havran Lubochna U19
- Ormeau FC