Futbol O ile başlayan takımlar
- Orbi Tbilisi 2
- Ozd Sajovolgye
- Operario Ltda U20
- Orel Minsk
- OZD Sayovolgi
- Operario FC Ltda U20
- Operário FC MT U20
- Orthodox
- Ottawa Redblacks
- Onehunga Mangere United AFC
- Onehunga Mangere United
- Orzel Pawlowice Wroclaw
- Olympie Tyn Nad Vltavou
- Odense (Women)
- Oberlausitz Neugersdorf
- Oeste Sao Paulo
- Olimpico EC U20
- Olimpico EC Itabaianinha U20
- Operario FC MT
- Operario Varzea Grande U20
- Oceanside Dutch Lions (W)
- Oakland Soul SC (W)
- Ozarowianka OM
- Olympia Warriors Hobart 2
- Oberndorfer SK
- Olympic Brisbane W.
- Oikawa, Mizuki
- Opava (N)
- Olmecas De Tabasco
- Operario MS U20
- Oeste FC SP
- Olimpija Ljubljana (N)
- Odd BK (W)
- Oldland Abbotonians FC
- O Connor Knights SC U23
- Oly Town (Women)
- Operario AC De Dourados U20
- Olympia Washington (Women)
- Ole
- Olympic Football Club U23
- Ogden, Trey
- Özcan, Tayfun
- Oliveira, Charles
- O'Malley, Sean
- O'Sullivan, Rhian
- Oeirense PI U20
- O Connor Knights FC (N)
- Ostinghausen 1947
- OFK Trebatice
- OFK Tovarniky
- OFK 1950 Priechod