| O lucky man! | Price Alan | Warner | WB 46227 |
| Oasis | Rasa | Lotus Eye | BBT-S-16 |
| Ocean | Micus Stefan | ECM | 1318 |
| Oh Yeah? | Hammer Jan Group | Nemperor | W 50276 |
| Old crest on a new wave | Mason Dave | CBS | 83828 |
| Old soldier never die | Heads hands & feet | Atlantic | K 40465 |
| Olympic rock & blues circus | Olympic Rock & Blues Circus | Jeton | 1003321 |
| Omega III | Omega | Bacillus | BAC 2030 |
| Ommadawn | Oldfield Mike | Virgin | 89552 XOT |
| On duke's birthday | Westbrook Mike | Hat ART | 2012 |
| Once again | Barclay James Harvest | Sire | SI 4904 |
| Ondas | Nock Mike | ECM | 1220 |
| One for the world | Hardin and York | Decca | SLK 16722-P |
| One of a kind | Bruford Bill | Polydor | POLD 5020 |
| One world | Rare Earth | Rare Earth | 1C 062-91 996 |
| Open | Hillage Steve | Virgin | V 2135 |
| Open road | Donovan | Epic | BN 26278 |
| Orange town | Schlüter Wolfgang/Spendel Christoph | EMI | 1C066-64 599 |
| Oregon | Oregon | ECM | 1258 |
| Orgue vol.2 | Louiss Eddy | America | AM 6132 |
| Other roads | Scaggs Boz | CBS | 461121 |
| Our only weapon is our music | Gonzalez | EMI | EMC 3100 |
| Out in the sun | Moraz Patrick | Charisma | CDS 4007 |
| Out of the mist | Illusion | Island | ILPS 9489 |
| Out West | Alex Campbell | Society | SOC 912 |
| Outside inn | Witchcraft | Philips | 6 305 389 |
| Over the rainbow, the last concert | Various artists | Chrysalis | 6 307 547 |
| Over the top | Powel Cozy | Ariola | ARL 5038 |
| Owlcreek incident | Prelude | Dawn | DNLH 3 |