Opaque Blue

Black Metal - Bosnia and Herzegovina

Open Grave (USA-1)

Black Metal - USA

Open Hell

Black Metal - Poland

Opera IX

Black Metal - Italy

Operation Volkstod

Black Metal - Germany

Operation Winter Mist

Black Metal - Canada

Opethian

Black Metal - Brazil

Opferblut

Black Metal - Canada

Opfern

Black Metal - Spain

Opfertod

Black Metal - Czechia

Ophian

Black Metal - USA

Ophidian Coil

Black Metal - Serbia

Ophidian Forest

Black Metal - USA

Ophidian Malice

Black Metal - Russia

Ophiel

Black Metal - USA

Ophthalamia

Black Metal - Sweden

Opiatdöd

Black Metal - Sweden

Opositor (COL)

Black Metal - Colombia

Opositor (HUN)

Black Metal - Hungary

Oppenheimer

Black Metal - USA

Opposite Devotion

Black Metal - Mexico

Oppress

Black Metal - United-Kingdom

Oppressive Descent

Black Metal - USA

Oppressive Light

Black Metal - Other

Optoletum

Black Metal - Norway

Opus 666

Black Metal - Brazil

Opus Dei (USA)

Black Metal - USA

Opus Diaboli

Black Metal - Uruguay

Opus Draconis

Black Metal - Portugal

Opus Forgotten

Black Metal - Norway

Opus Magorum

Black Metal - Greece

Opus Mortem

Black Metal - Sweden

Opus Mortifer

Black Metal - Italy

Opus Nocturnales

Black Metal - Belgium

Opus Nocturne

Black Metal - Mexico

Opus Nocturnem

Black Metal - Brazil

Opus Profanus

Black Metal - Brazil

Opvs Nostri

Black Metal - Brazil

Oracle (ITA)

Black Metal - Italy

Oraison Funèbre

Black Metal - France

Orant

Black Metal - Czechia

Orbios

Black Metal - France

Orbis Daemonium

Black Metal - Brazil

Orchid (ITA)

Black Metal - Italy

Orcivus

Black Metal - Sweden

Orco

Black Metal - Brazil

Orcrist

Black Metal - Italy

Orcultus

Black Metal - Sweden

Orcus (GRC)

Black Metal - Greece

Orcus (PL)

Black Metal - Poland

Orcustus

Black Metal - Norway

Ord

Black Metal - Canada

Ordalie

Black Metal - France

Ordem Da Caveira

Black Metal - Other

Ordem Satânica

Black Metal - Portugal

Order

Black Metal - Norway

Order Of Bileth

Black Metal - USA

Order Of Darkness

Black Metal - USA

Order Of Leviathan

Black Metal - USA

Order Of Nosferat

Black Metal - Germany

Order Of Orias

Black Metal - Australia

Order Of Tepes

Black Metal - United-Kingdom

Order Of The Ebon Hand

Black Metal - Greece

Ordinance (FIN)

Black Metal - Finland

Ordinul Negru

Black Metal - Romania

Ordo Blasphemus

Black Metal - France

Ordo Draconis

Black Metal - Netherlands

Ordo Karnivorum

Black Metal - Russia

Ordo Nigris Imperia

Black Metal - Ecuador

Ordo Sanguinis Noctis

Black Metal - Poland

Ordo Spiritum Invictis

Black Metal - France

Ordo Templi Aeternae Lucis

Black Metal - France

Ordog (FRA)

Black Metal - France

Ordog (RUS)

Black Metal - Russia

Ordog (UK)

Black Metal - United-Kingdom

Ordoxe

Black Metal - Canada

Ordum

Black Metal - Lebanon

Orek

Black Metal - Germany

Orelisk

Black Metal - USA

Oremus

Black Metal - Poland

Orenda (BGR)

Black Metal - Bulgaria

Orga

Black Metal - USA

Organ Trails

Black Metal - Switzerland

Orgg

Black Metal - Italy

Orgiastic Perversion

Black Metal - Brazil

Orgrel

Black Metal - Italy

Orgy Of Carrion

Black Metal - USA

Orhorho

Black Metal - Italy

Oriflamme (BEL)

Black Metal - Belgium

Oriflamme (CAN)

Black Metal - Canada

Origami Galaktika

Black Metal - Norway

Original Sin (CHN)

Black Metal - China

Orion (UK-1)

Black Metal - United-Kingdom

Orion Belt

Black Metal - Russia

Ork

Black Metal - Spain

Orkteria

Black Metal - Norway

Orlog

Black Metal - Germany

Orlok (FIN)

Black Metal - Finland

Ormagna

Black Metal - Iceland

Ormgard

Black Metal - Sweden