Opprobrium (Incubus) - Serpent Temptation
ss, 1988, High Roller D (2023)
Onslaught - The Force
ss, 1986, High Roller D (2019)
Oniricous - Ritos Diabolicos
n, 2013, Equinox SPA (2015)
Omen - Into the Arena
n, 2012, No Remorse GRE
Omen - Battle Cry
ss, 1984, High Roller D (2022)
Omega Infinity - Solar Spectre
n, 2020, Seasons of Mist FRA
Olde - The Gates of Dawn
n, 2013, Soulseller NL
Old Mans Child - Slaves of the World
n, 2009, Floga GRE (2018)
October Tide - In Splender Below
n, 2019, Agonia PL
Obtest - Auka Seniems Dievams
n, 2001, Leda Takas LIT (2011)
Obtest - Amžina Aušra
n, 2011, Ledo Takas LIT
Obsidian Kingdom - A Year with no Summer
n, 2016, Season of Mist FRA
Obituary - Dead
ss, 1998, Listenable FRA (2018)
Oak - Oak
n, 2009, A389 Recordings USA
Oak - ii
n, 2010, A389 Recordings USA
Nupta Cadavera - Nupta Cadavera
n, 2019, Nuclear War Now USA
Nunslaughter - Metal Assault on Melbeurne & Brisbane
n, 2009, Hells Headbangers USA (3 x 7")
Not Fragile / Z-Iron - Masters of Metal
ss, 2004, Hellion DŠedý vinyl