 | One Man Army And The Undead Quartet - The Dark Epic... Metal |  25.02.2011 |
 | One Tail, One Head - Worlds Open, Worlds Collide Metal | 05.10.2018 |
 | One-Way Mirror - Destructive By Nature Metal | 16.04.2012 |
 | Onfodt - Norden Metal |  13.08.2021 |
 | Onheil - In Black Ashes Metal | 14.07.2023 |
 | Onheil - Storm Is Coming Metal | 05.09.2014 |
 | Oni - Loathing Light Metal | 17.06.2022 |
 | Onirik - Casket Dream Veneration Metal | 23.10.2015 |
 | Onirik - Curling Serpents Under Stone Metal | 30.05.2025 |
 | Onirik - The Fire Cult Beyond Eternity Metal | 25.09.2020 |
 | Onirophagus - Endarkenment Metal |  19.02.2019 |
 | Onirophagus - Revelations From The Void Metal | 17.01.2025 |
 | Onlap - Waves Metal | 14.06.2024 |
 | Onmyo-Za - 雷神創世 Metal | 24.09.2014 |
 | Onmyo-Za - 風神界逅 Metal | 24.09.2014 |