Onysus

Progressive Metal · Portugal

1 Album

Onyxblade

Black Metal · United States

1 Album

OOBE

Alternative Metal · Poland

3 Albums

Ook

Doom Metal · Finland

1 Album

öOoOoOoOoOo

Avant-Garde Metal · France

1 Album

Oozing Wound

Thrash Metal · United States

5 Albums

Opal Insight

Doom Metal · France

1 Album

Opal In Sky

Metalcore · Canada

5 Albums

Opaque Mass

Death Metal · Netherlands

1 Album

Op de swarte Thraun

Black Metal · Germany

1 Album

Open Carry State

Mathcore · United States

2 Albums

Open Casket

Death Metal · Mexico

1 Album

Opened Paradise

Gothic Metal · Greece

4 Albums

Open Fire

Nu Metal · Italy

1 Album

Open Fire

Speed Metal · Poland

1 Album

Open Flesh Wound

Brutal Death Metal · United States

3 Albums

Opensight

Metal · United Kingdom

1 Album

Open Tomb

Sludge Metal · New Zealand

3 Albums

Open Wide, The Sky

Progressive Metal · United States

1 Album

Open Wound

Grindcore · Australia

3 Albums

Opera IX

Black Metal · Italy

12 Albums

Opera Magna

Power Metal · Spain

10 Albums

Operation: Mindcrime

Progressive Metal · United States

3 Albums

Opertus

Gothic Metal · Czechia

1 Album