| Artist | Title | Cat # | Label | Year | Country | Genre | Description | Price |
| Obituary | Cause of Death | 00931 | Roadrunner | 1990 | USA | $12.00 | ||
| Obscenity | Cold Blooded Murder | 12551 | SPV | 2002 | Germany | Death | $11.00 | |
| Obscenity | Human Barbecue | 12687 | Morbid | 1998 | Germany | Death | EXTREMELY hard to find release. | $22.00 |
| Obscenity | Intense | 12550 | SPV | 2000 | Germany | Death | Was a limited release. Now hard to find | $18.00 |
| Oceans of Sadness | For We Are | 15609 | LSP | 2000 | Belgium | Doom | My Dying Bride meets Tiamat | $12.00 |
| Odin | Fight for Your Life | 05776 | Perris | USA | $17.00 | |||
| Odyssea | Tears in Floods | 14741 | Scarlet | 2004 | Italy | Power | Melodic Progressive Power metal with Labyrinth members Rob Tyrant and Pier Gonella | $16.00 |
| OHM | OHM | 10863 | Lion | 2003 | Sweden | Instr. | Guitar oriented fusion rock. | $13.00 |
| Old Dead Tree, The | The Perpetual Motion LTD | 16008 | MMV | 2005 | USA | Doom | A compelling mixture of catchy gothic rock and melancholy doom metal. Combo of clean and death vox. A great album for all fans of doom. This is the digibook version. | $15.00 |
| Old Man's Child | Ill-Natured Spiritual Invasion | 12651 | Century Black | 1998 | USA | Death | $16.00 | |
| Old Man's Child | In Defiance of Existence | 10507 | Century Media | 2003 | Germany | Metal | Ltd ed in slide case…Symphonic Black Metal ex Dimmu Borgir members | $17.00 |
| Omen | Warning of Danger | 11359 | Metal Blade | 1985 | Germany | Metal | Classic metal. For Maiden fans | $12.00 |
| On Thorn I Lay | Crystal Tears | 02364 | Holy | 2000 | France | $17.00 | ||
| On Thorns I Lay | Egocentric | 13209 | BLR | 2003 | Greece | Goth | Melancholic romantic Goth rock, with excellent riffage and immaculate production | $16.00 |
| Once and Future King (Gary Hughes) | Rock Opera Part I | 13629 | Frontiers | 2003 | Italy | Rock | With Gary Hughes, Lana Lane, Danny Vaughn, Bob Catley, Damian Wilson, Irene Jansen, Neil Harris, Etc.. Fantastic music and vocals! Beautifully packaged. | $16.00 |
| Once and Future King (Gary Hughes) | Rock Opera Part II | 13630 | Frontiers | 2003 | Italy | AOR | The second/final part of this story of King Arthur. Great cast, w/ D.C. Cooper, Doogie White, Bob Catley, Gary Hughes, Harry Hess, Lana Lane, Irene Jansen etc. | $16.00 |
| Only Child | II | 06586 | Seagull | 1996 | Germany | Rock | Hard Rock with Paul Sabu OOP | $18.00 |
| Onward | Evermoving | 04547 | Century Media | 2001 | USA | $16.00 | ||
| Onward | Reawaken | 07191 | Century Media | 2002 | USA | Metal | 2-CD 1st pressing incl.13 song power metal sampler | $16.00 |
| Opeth | Morningrise +1 Ltd | 15057 | Candlelight | 2000 | UK | Metal | Melodic death reissue limited edition with bonus track | $17.00 |
| Opeth | My Arms, Your Hearse | 07156 | Century Media | 1998 | USA | Metal | Melodic death | $16.00 |
| Opeth | Orchid | 07155 | Century Media | 1997 | USA | Metal | Melodic death | $16.00 |
| Opeth | Still Life | 10960 | Peaceville | 2003 | UK | Metal | Melodic Death | $16.00 |
| Opus Atlantica | Opus Atlantica | 10800 | Regain | 2003 | Import | Power | Epic power metal | $16.00 |
| Oratory | Beyond Earth | 09990 | Recital | 2002 | Portugal | Metal | Portugese power metal w/killer female vocalist and excellent chorus work | $16.00 |
| Organization, The | Savor the Flavor | 11389 | Metal Blade | 1995 | USA | Metal | Former members of Death Angel | $11.00 |
| Origin | Informis Infinitas Inhumanitas | 12552 | Relapse | 2002 | USA | Death | $12.00 | |
| Orion Riders | A New Dawn | 13065 | LMC | 2003 | Finland | Impressive debut album by this Italian symphonic power metal band. Recommended for fans of Sonata Arctica and Stratovarious | $16.00 | |
| Orphaned Land | Mabool 2CD Limited | 15943 | CM | 2004 | USA | Prog | Brilliant mix of vocal styles, Middle Eastern guitar riffage, & melody with exotic instrumentation, choirs. Incredible concept metal album! Ltd 2CD version. | $19.00 |
| Osbourne, Ozzy | Tribute | 00191 | CBS | 1987 | USA | $19.00 | ||
| OSI | Office of Strategic Influence LTD | 10842 | Inside Out | 2003 | USA | Prog | Ltd digibook with bonus CD. Members of Dream Theater and Fates Warning | $17.00 |
| Outlander | Outlander | 10055 | Idie | 2001 | USA | Prog | Excellent Technical Progressive Melodic and Heavy w/ great production | $16.00 |
| Outrage | Black Clouds | 16327 | Polydor | 1988 | Japan | Thrash | WAAY out of print and rare first full-length disc from this speed/thrash band from Japan. Mint cd and inserts. No obi. You won't find this title anywhere else! | $79.00 |
| Over Soul | Seven Days in November | 10415 | Brainticket | 2000 | USA | Doom | Doom/Stoner with some Katatonia style melodies | $16.00 |
| Overlife | Last Millennium | 15819 | GTR | 2001 | Spain | Prog | Secondhand OOP Import...heavy Progressive | $16.00 |
| Oxygene 8 | Poetica | 13886 | Indie | 2003 | Prog | Unique and quirky, spacey, some electronica…for fans of Porcupine Tree. | $19.00 | |
| Ozric Tentacles | Afterwish | 05716 | SMDCD | 1998 | UK | 2-CD | $19.00 | |
| Ozric Tentacles | Arborescence | 09013 | SMMCD | 1999 | UK | Prog | Cosmic rock | $14.00 |
| Ozric Tentacles | Become the Other | 11361 | SMM | 1999 | UK | Prog | Synth technical progressive rock..Unique | $14.00 |
| Ozric Tentacles | Jurassic Shift | 08733 | SMMCD | 1998 | UK | Prog | One of the most interesting prog rock bands | $15.00 |
| Ozric Tentacles | Strangeitude + 1 | 08732 | SMMCD | 1998 | UK | Prog | One of the most interesting prog rock bands | $15.00 |
| Ozric Tentacles | Tantric Obstacles/Erpsongs 2-CD | 05238 | SMD | 2000 | UK | Prog | 2-CD | $19.00 |
| Ozric Tentacles | The Bits Between the Bits / Sliding Gliding Worlds | 05024 | Snapper | 2000 | UK | Prog | 2-CD | $19.00 |
| Ozric Tentacles | There is Nothing - Live Ethereal Cereal | 05017 | SMD | 2000 | UK | Prog | 2-CD | $19.00 |