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| Artist | Title | Format | Label | Release | Country | Year | Condition | Genre | Price |
| Ono Gagaku Kai | Japon3 Gagaku | LP | Ocora | 1983 | france | 1979 | Good | folk | |
| Onra | Long Distance | 2LP | All-cityrecords | 2009 | france | 2009 | Good | hip hop | |
| Orchestre Batuan | Bali Musique Et Theatre | LP | Ocora | 70s | france | 1971 | Good | folk | |
| Orchestre Rouge | Des Restes | LP | Orchestre | 80s | france | 80s | Medium | post punk | |
| Orchestre Rouge | More Passion Fodder | LP | Rca | 1983 | france | 1983 | Good | post punk | |
| Orchestre Rouge | Yellow Laughter | LP | Rca | 1982 | france | 1982 | Good | post punk | |
| Organisation | Tone Float | LP | Drone Syndicate | 1994 | uk | 1970 | Perfect | krautrock | |
| Ornette Coleman | Friends And Neighbors | LP | Rca | 70sjazzline series | france | 1970 | Good | jazz | |
| Ornette Coleman | New York Is Now! | LP | Blue Note | 1968 | usa | 1968 | Medium | free jazz | |
| Ornette Coleman | Ornette On Tenor | LP | Atalantic | 1962 | france | 1962 | Medium | free jazz | |
| Ornette Coleman | Skies Of America | LP | Cbs | reissue | usa | 1972 | Good | orchestral | |
| Ornette Coleman | Tomorrow Is The Question | LP | Contemporay | reissue zyx | germany | 1959 | Perfect | free jazz | |
| Ornette Coleman | Town Hall 1962 | LP | Get Back | 1998 | italy | 1962 | Perfect | free jazz | |
| Ornette Coleman Double Quartet | Free Jazz A Collective Improvisation | LP | Atalantic | reissue | usa | 1960 | Perfect | free jazz | |
| Ornette Coleman Quartet | Ornette! | LP | Atalantic | reissue | usa | 1961 | Perfect | free jazz | |
| Osibisa | B.o.f Super Fly T.n.t. | LP | Buddah | 1973 | france | 1973 | Medium | funk | |
| Osibisa | Woyaya | LP | Warner | 1971 | france | 1971 | Bad | afro pop | |