Omen - Battle Cry
ss, 1984, High Roller D (2022)
Omen - Into the Arena
n, 2012, No Remorse GRE
Oniricous - Ritos Diabolicos
n, 2013, Equinox SPA (2015)
Onslaught - The Force
ss, 1986, High Roller D (2019)
Opprobrium (Incubus) - Serpent Temptation
ss, 1988, High Roller D (2023)
Opus Forgotten - Demon of Destruction
m, 2000, Aftermath Music, NOR
Orcrist - Fallen
n, 2011, Aphelion UK
Orden Ogan - Final Days
ss, 2020, AFM D - clear vinyl
Ordo Inferus - Invictus et Aeternus
n, 2014, Doomentia CZ
Organismos - Manejos Invisibles
n, 2011, Me Saco un Ojo Records UK
Origin of Infinity - The Last Day on Earth
n, 2020, Origin of Infinity
Orphaned Land - The Forbidden Tracks
n, 2019, Night of the Vinyl Dead ITA
Orthodox - Sentencia
ss, 2009, Alone records SPA (black vinyl)
Orthodox - Sentencia
ss, 2009, Alone records SPA (white vinyl)
Outrage - 1985 Demo(n)s
n, 1985, Ripping Storm, ITA (2014)
Outrage - The Book of the Seven Seals
n, 1987, Ripping Storm ITA (2023)
Pagan - Gehasst
m/m, 1997, Zorn D
Pagan Rites - Embrace the Torments of Hell
m/ex, 2010, Atolinga MEX