 | Onslaught - Origins Of Aggression Metal |  23.05.2025 |
 | Ontborg - Following The Steps Of Damnation Metal |  24.02.2023 |
 | Onward - Of Epoch And Inferno Metal | 28.10.2022 |
 | Oomph! - Richter Und Henker Metal |  11.07.2023 |
 | Oomph! - Ritual Metal | 18.01.2019 |
 | Oomph! - XXV Metal | 31.07.2015 |
 | Oozing Wound - We Cater To Cowards Metal | 27.01.2023 |
 | Opera Diabolicus - Death On A Pale Horse Metal | 26.11.2021 |
 | Opera IX - Back To Sepulcro Metal | 01.11.2015 |
 | Opera IX - The Gospel Metal | 17.11.2018 |
 | Opera Magna - Del Amor Y Otros Demonios - Acto II [EP] Metal | 17.12.2015 |
 | Opera Magna - Heroica Metal | 01.03.2024 |
| Operatika Element - [Nowa Płyta] Metal | nieustalona |
 | Operation: Mindcrime - Resurrection Metal | 23.09.2016 |
 | Operation: Mindcrime - The Key Metal | 18.09.2015 |