Death-Black-Doom
Orthodox - Sentencia
ss, 2009, Alone records SPA (black vinyl)
Orphaned Land - The Forbidden Tracks
n, 2019, Night of the Vinyl Dead ITA
Origin of Infinity - The Last Day on Earth
n, 2020, Origin of Infinity
Origin - Chaosmos
n, 2022, Agonia PL (red vinyl)
Organismos - Manejos Invisibles
n, 2011, Me Saco un Ojo Records UK
Ordo Inferus - Invictus et Aeternus
n, 2014, Doomentia CZ
Orcrist - Fallen
n, 2011, Aphelion UK
Opprobrium (Incubus) - Serpent Temptation
ss, 1988, High Roller D (2023)
Oppressor - The Demos
n, 1993, Hammerheart NL (2024) blue vinyl
Omega Infinity - Solar Spectre
n, 2020, Seasons of Mist FRA
Olde - The Gates of Dawn
n, 2013, Soulseller NL
Old Mans Child - Vermin
n, 2005, Cosmic Key NL (2024)
Old Mans Child - Revelation 666: The Curse of Damnation
n, 2000, Cosmic Key NL (2024)
Old Mans Child - In Defiance of Existence
ss, 2003, Abstract Emotions SPA (2024)
Old Mans Child - Ill-Natured Spiritual Dimension
n, 1998, Cosmic Key NL (2025)
October Tide - In Splender Below
n, 2019, Agonia PL
Obtest - Auka Seniems Dievams
n, 2001, Leda Takas LIT (2011)
Numen - Numen
n, 2021, Les Acteurs de l'Ombre FRA