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Avant-Garde Metal

1 Album

Opal Insight

Doom Metal

1 Album

Oppressive Light

Depressive Black Metal

2 Albums

Orakle

Black Metal

4 Albums

Orbis

Doom Metal

1 Album

Ordalie

Black Metal

2 Albums

Order of the Death's Head

Black Metal

8 Albums

Ordo Blasphemus

Black Metal

2 Albums

Ordo Templi Aeternae Lucis

Black Metal

3 Albums

Orotoro

Progressive Metal

6 Albums

Osculum Infame

Black Metal

4 Albums

Osias Von Doom

Doom Metal

7 Albums

Otargos

Black Metal

9 Albums

Otium Adei

Doom Metal

1 Album

Ouroboros

Brutal Death Metal

1 Album

Overmars

Sludge Metal

3 Albums

Oversoul

Power Metal

3 Albums

Owl Cave

Black Metal

1 Album

Öxxö Xööx

Doom Metal

4 Albums

Palantyr

Heavy Metal

1 Album

Pâlefroid

Black Metal

3 Albums

Paramnesia

Black Metal

4 Albums

Pavillon Rouge

Black Metal

4 Albums

Paydretz

Melodic Black Metal

1 Album