ClubLocationLeagueTierFounded
OF Arkalochoriou—EPS Heraklion - A1—1960OFAM—EPS Kerkyras - A—1972OFI Ierapetras—Super League Greece 2—1970OFI U20——Odysseas Anagennisi—Dissolved 2012—1952Odysseas Kordeliou—EPS Makedonias - B—1947Oikonomos—Gamma Ethniki - Group 3—1953Olympiakos Agiou Stefanou—EPS ANA - A—UNKOlympiakos B—Super League Greece 2—2021Olympiakos Lamias—EPS Phthiotidas - A—1975Olympiakos Laurium—EPS ANA - C—1926Olympiakos Neon Liosion—EPS Athinon - A—1952Olympiakos U20——Olympiakos Volou—EPS Thessalias - A—1937Olympos Kerkyras—EPS Kerkyras - A—1934Opountios—Gamma Ethniki - Group 4—1932Orchomenou—Dissolved Inactive—1945Orestis——Orfeas Eleftheropouli—EPS Kavalas - A—1925Orfeas Xanthis—Gamma Ethniki - Group 1—1903