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| Oceans Of Sadness | Mirror Palace | Prog Metal | |
| Octavia Sperati | Winter Enclosure | Gothic | |
| October Equus | October Equus | Prog | |
| Odin's Court | Deathanity | new | Prog Metal |
| Odra Reg | God's Garden | Prog | |
| Odyssice | Impression | Prog | |
| Of The Wand and the Moon | Emptiness, Emptiness, Emptiness | Gothic | |
| Ohm | Ohm | Fusion | |
| Ohm | Live on PKFK 90.7 FM | Fusion | |
| O'Hora Tony | Escape Into the Sun | Hard Rock | |
| Okumoto Ryo | Coming Through | Prog | |
| Old Dead Tree | The Nameless Disease | Gothic Metal | |
| Olson Mark | The Salvation Blues | Roots Rock | |
| Omega | The Prophet | Prog Metal | |
| Omni | El Vals de los Duendes | Prog | |
| Oniric | Suggestioni | Gothic | |
| Onze H30 | Onze H30 | Rock | |
| Oophoi & Louisa John Kroll | I Hear the Water Dreming | Electronic | |
| Open Up | Open Up | AOR | |
| Opera Noire | Bad Intent | Gothic | |
| Opposition Of One | I Try to Understand This | Metal Core | |
| Opus Est | Opus I | Prog | |
| Oresund Space Collective | Oresund Space Collective | Space Rock | |
| Oresund Space Collective | It's All About Delay | Space Rock | |
| Oresund Space Collective | The Black Tomato | Space Rock | |
| Orme, Le | Live in Pennsylvania | new | Prog |
| Osada Vida | Three Seats Behind a Triangle | Prog | |
| Osada Vida | The Body Parts Party | new | Prog |
| Osi | Free | Prog Metal | |
| Osiris | Beyond Control | Prog | |
| Osiris | Visions From the Past | Prog | |
| Other, the | We Are Who We Eat | Horror Punk | |
| O-U | O-U | Prog | |
| Outer Limits | Stromatolite | Prog | |
| Over The Edge | Over The Edge | AOR | |
| Overhead | Metaepitome | Prog | |
| Oz Noy | Ha! | Fusion | |
| Ozark Mountain Daredevils | Our Most Dangerous Stunts | Country | |
| Ozric Tentacles | Spirals in Hyperspace | Prog | |
| Ozric Tentacles | The Floor's Too Far Away | Prog |