Oakmord

Metal

3 Albums

Oath

Black Metal

4 Albums

Obcasus

Black Metal

2 Albums

Obfuscation

Death Metal

1 Album

Oblivion Gate

Black Metal

3 Albums

Obscenum

Death Metal

1 Album

Obscurant

Doom Metal

3 Albums

Obscure Burial

Black Metal

1 Album

Oceanwake

Doom Metal

4 Albums

OctaThorn

Gothic Metal

2 Albums

October Falls

Atmospheric Black Metal

9 Albums

Octoploid

Melodic Death Metal

1 Album

Oddland

Progressive Metal

3 Albums

Odiosior

Black Metal

2 Albums

Odious Devotion

Black Metal

3 Albums

Ofghost

Black Metal

3 Albums

Old Sorcery

Black Metal

11 Albums

Olio Tähtien Takana

Avant-Garde Metal

3 Albums

Omegathrum Moon

Black Metal

1 Album

Omnium Gatherum

Melodic Death Metal

12 Albums

Omnivortex

Technical Death Metal

3 Albums

Ondfødt

Black Metal

6 Albums

Ondrim

Black Metal

1 Album

Onkalo

Doom Metal

2 Albums