Olympiakos or Olympiacos 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
- Olympiacos S.C., the men's volleyball department of Olympiacos CFP
- Olympiacos Water Polo Club, the men's water polo department of Olympiacos CFP
- Olympiacos Women's Water Polo Team, the women's water polo department of Olympiacos CFP
- Olympiacos women's volleyball, the women's volleyball 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
- Olympiacos Volou 1937 F.C., a football club in Volos, Greece
See also
- All pages with titles containing Olympiakos
- Olympikus, a Brazilian sports manufacturer