| Band | Album | Grade | Written on... |
| Obscenity | Retaliation | 8 | April 27th, 2016 |
| Obscura | Diluvium | 9 | July 23rd, 2018 |
| Okidoki | When Oki Meets Doki | 8 | September 24th, 2019 |
| Ond Cirkel | Svavelvinter / Vilda Syrener | 7 | July 18th, 2018 |
| Oneiric Celephaïs | The Obscure Sibyl | 9 | July 19th, 2020 |
| One Tape | Goldfischglas | 8 | September 29th, 2020 |
| Onmens | Witruimte | 7 | March 23rd, 2016 |
| öOoOoOoOoOo | Samen | 10 | September 14th, 2016 |
| Opiliones / Frana | Split 7-Inch | 8 | April 8th, 2016 |
| Orakle | Éclats | 10 | April 9th, 2015 |
| OT&DO | OT&DO At The Place | 8 | September 18th, 2019 |