Football Teams Starting with O
- Oltrepo FC
- Odense Bk Ii Women
- OB Odense II W.
- Once Deportivo Ahuachapan Reserves
- Operario Lagoa
- Olimpico Litoral
- Oyonesa (Women)
- OFK Sofia 1992 U19
- Oriental La Paz
- OFC Sofia U19
- Oltrepo FBC
- Olympique Rovenain U19
- Olympique Rovenain (U 19)
- Oliveira De Frades
- Os Gavionenses
- Osasuna (Women)
- Olympia Bobrov
- Orzel Marszowice
- Oviedo Moderno Women
- Olimpia Gherla W
- Olympic Charleroi CF
- Ogura, Kosuke
- Oliveira, Goncalo
- Oleksandria U19
- OFC Kom Berkovitsa
- OFK Beograd (U 19)
- Odra Wodzislaw
- Oregon Tech University
- Oriental (U 19)
- Olympique Marcquois U19
- Olaria U20
- Orientacion Maritima (W)
- Olympique Marcquois (U 19)
- Okoshi Kyoto AC
- O Elvas CAD U19
- Old Dominion Monarchs (Wom)
- Oissel
- Oriente Petrolero (N)
- OM AL Qutain
- Old Veste 54
- Olde Veste'54
- Oddor Meanchey Province
- Odds U19
- Olympic Star Cluj (Women)
- Olimpic Star Cluj Napoca
- Olympico Golubovci
- Osterakers United FK
- Orix Buffaloes
- Olesnice U Bouzova
- OFK Radnicki Nis
- OFK Radnicki Nis U19