Order of the Dead

Thrash Metal

3 Albums

Order of the Nameless Ones

Black Metal

2 Albums

Ordinance

Death Metal

2 Albums

Ordo Anguis

Doom Metal

1 Album

Ordo Obsidium

Funeral Doom Metal

2 Albums

Ordrhein

Black Metal

2 Albums

Oreamnos

Black Metal

3 Albums

Orelisk

Black Metal

1 Album

Organ Dealer

Grindcore

3 Albums

Organ Trail

Death Metal

3 Albums

Orgone

Avant-Garde Metal

4 Albums

Orgy of Carrion

Black Metal

7 Albums

Orialus

Metalcore

1 Album

Origin

Technical Death Metal

10 Albums

Original God

Metal

9 Albums

(Origin Unknown)

Metalcore

1 Album

Orinoco

Metalcore

3 Albums

Orm

Doom Metal

2 Albums

Orodruin

Doom Metal

3 Albums

Oromet

Funeral Doom Metal

2 Albums

Orphans of Doom

Metal

2 Albums

Orthodox

Metal

5 Albums

Oryad

Symphonic Metal

2 Albums

Oryon Rex

Nu Metal

1 Album