Oak - Disintegrate

Oathbound - Until It's Gone

Ob Nixilis - Abhorred

Obituary - Cause of Death (Live Infection)

Obituary - Slowly We Rot (Live and Rotting)

Obscene - Agony & Wounds

Obscene - From Dead HorizonTo Dead Horizon

Obscura Qalma - Veils Of Transcendence

Obscure Fate - Shades of a Dying World

Obscured Existence - Cystic Incursion

Obscureviolence - Refuting the Flesh

Obscurial - Heretic

Obscuritas - Engendrado en Muerte

Obscurity - Ascheregen

Obsidian Mantra - As We All Will

Obsidian Skies - Saturnian

Obsidious - Iconic

Obtruncation - The Callous Concept

Obvurt - Triumph Beyond Adversity

Occulsed - Antegnosis

Occulsed - Parturition of Adulteration

Odd Crew - Dark Matters Part II

Odd Eyed - Swords and Serpents

Of Darkness - Missa Tridentina

Offerblod - Vart sista nederlag

Okami CA - VOL 1

Okami CA - Vol 2

Okami CA - Vol 3: The Nihilist Chronicles

Okkultist - O M E N

Okular - Regenerate

Olamot - Path of Divinity

Old Night - Ghost Light

Old Skull - The Cult

Old Year - No Dissent

Olkoth - At the Eye of Chaos

Omelas - Dawn

Omicidio - Premature Exequie

Ominous Ruin - Requiem

Ominous Scriptures - Rituals Of Mass Self-Ignition

Omnerod - The Amensal Rise

Omnia Moritur - Ex Inferis

Omnicidal - The Omnicidalist

Omnicidal Instinct - Catharsis In Blight

Omnifariam - The Summoning

Omnium Gatherum - May The Bridges We Burn Light The Way

Omnivide - A Tale of Fire

Omnivide - Arise

Omnivortex - Throne Of Absolute Chaos

Omophagia - Rebirth in Black

Once Upon the End - Archive 200

Onchocerciasis Esophagogastroduodenoscopy - Fugue Gnawed from the Scabbed God Cerebrum

One Day In Pain - In Pain We Trust

One Hundred Thousand - Liminal

One Mind Ministry - Gates Of Time

Onheil - In Black Ashes

Onsetcold - Apocalyptic Sleep

Oobris Ios - Vospat

Opal Insight - Heir to Anger

Open Casket - Annihilation Summoning

Open Kasket - Trials of Failure

Open Surgery - Absolute Destruction

Open the Coffin - The World Is a Casket

Ophidian Memory - Our Shattered Garden

Ophidian Memory - The Stag

Ophiocordyceps - Anthropocene

Ophiolatry - Serpent's Verdict

Ophirae - Ophidian

Opium Death - Genocidal Nemesis

Oracle of Worms - Cult of Suffering

Oracle Spectre - Deceivers

Oraculum - Hybris Divina

Orbstruct - Ostracism

Orchid Throne - Buried in Black

Order 227 - Rattenkrieg

Order Ov Riven Cathedrals - Absolute

Ordh - Blind in Abyssal Realms

Orecus - Dreadnought

Organ Trail - Appetite for Dissection

Organectomy - Nail Below Nail

Origin - Chaosmos

Orphalis - As The Ashes Settle

Orpheus Omega - Emberglow

Orthodoxy - Ater Ignis

Oshiego - Crossing The Bridge Of Siraat

Osiah - Aion

Osiah - Chronos

Osiah - Kairos

Osiah - Live

Ossuary - Abhorrent Worship

Ossuary - Forsaken Offerings

Ossuary - Stellar Annihilation

Ostoraton - Somood

Our Dying World - The Egregious Sins Of Humanity

Our Vile Goddess - Cataclysm

Out of the Mouth of Graves - Harbinger Uncerimonious

Outer Heaven - Infinite Psychic Depths

Outergods - A Kingdom Built Upon The Wreckage of Heaven

Outlying - Oblivisci

Ov Sulfur - Endless

Over A Barrel - Self-Inflicted Wounds