Olympiakos may refer to:
- Olympiacos CFP, a multisport club in Piraeus, Greece
- Olympiacos F.C., the football department of Olympiacos CFP
- Olympiacos B.C., the basketball department of Olympiacos CFP
- Olympiakos Chersonissos F.C., a football club in Chersonisos, Greece
- Olympiakos Neon Liosion, a football club in Ilion, Greece
- Olympiakos Nicosia, a football club in Nicosia, Cyprus
- Olympiakos Patras F.C., a football club in Patras, Greece
- Olympiakos Volou 1937 F.C., a football club in Volos, Greece