Calcio Squadre che iniziano con O
- Olympique DAles En Cevennes
- Olympias Lympia
- Ornament
- Olympic Star
- Once Deportivo Reserves
- Olympic Star FC
- Once Deportivo Ahuachapan (R)
- Oceania Futbol Club
- Old Melburnians SC
- Olimpia Occidental LEC
- OFK Partizan Cherven Bryag
- ORL Magic
- O´Higgins FC U21
- Oxford United LFC
- Olympique Saint Quentinois
- Oslo Fa
- Oviedo Moderno CF B
- Oviedo CB
- Obras Sanitarias
- Oostende (U 21)
- Oberwart
- Olympic Kingsway (U 20)
- Olimpija Ljubljana (U 19)
- Olimpik Tashkent
- Olympia Warriors Hobart Reserve
- Oakleigh Cannons (U 23)
- Orijent Rijeka
- Olympia Warriors Hobart
- Olympique Medea (U 21)
- Once Ahuachapan
- Oromia Police
- Omedla
- Orgullo Reynosa
- Onze Créateurs De Niaréla