O Sole Mio Entertainment

Germany

O Tannenbaum Records

Austria

O' Brien Records

USA

Oak Island Records

Germany

Oak Knoll Productions

USA

Oaken Palace Records

United-Kingdom

Oaken Shield

France

Oakfield Music Group

Sweden

Oakking Records

Netherlands

OarFin Distribution

USA

Oasis

Germany

Oasis D'Arts

Madagascar

Oasis Disc Manufacturing

USA

Oasis Records

South-Korea

Oath

unknown

Obee Records

USA

Obelisk Polaris Productions

Sweden

Obelisk Sounds

USA

OBH Musikverlag

Switzerland

OBI Records

unknown

Obiterdictum

Cyprus

Obituary Records

Sweden

Obitus Records

unknown

Object Enterprises

United-Kingdom

Objective-Subjective

USA

Obliteration Records

Japan

Oblivion

Germany

Oblivious Maximus

Australia

Obnoxious Cadaver Records

Australia

Obnoxious Noise Records

Finland

OBS Records

USA

Obscene Baby Auction Records

United-Kingdom

Obscene Extreme

Czechia

Obscene Productions

Czechia

Obscenity Cult Records

USA

Obscur Noise Prod

France

Obscura Funeralis Productions

France

Obscura Lyd Productions

Norway

Obscura Records

unknown

Obscurant Visions

Russia

Obscurantism Production

Canada

Obscuration Productions

Malaysia

Obscure Abhorrence Productions

Germany

Obscure Arts Productions

Germany

Obscure D-Vision

France

Obscure Domain Productions

Germany

Obscure Dungeon Records

France

Obscure Forest Productions

USA

Obscure Gate Productions

United-Kingdom

Obscure Musick

USA

Obscure Plasma Records

Italy

Obscure Productions

Australia

Obscure Propaganda Productions

Norway

Obscure Summoning

unknown

Obscure Transparency

unknown

Obscure Vanity

USA

Obscured Records

USA

Obscurica Records

USA

Obscuritas Aeterna

unknown

Obscurity Of Error Records

USA

Obscuro Records

Mexico

Obscvritas Pvtrefacta

Mexico

Obscvrvs Records

Italy

OBSE Productions

Greece

Observation Records

unknown

Observatory

unknown

Obsessed Records

unknown

Obsessed With Wickedness Records

USA

Obsession

unknown

Obsessive Fundamental Realism

Germany

Obsidian Banner Records

USA

Obsidian Factory Records

Japan

Obsidian Fortress Productions

Canada

Obsidian Records

Australia

Obsidian Sky Records

USA

Obsidian Spells

USA

Obskure Chaos

Brazil

Obskure Sombre Records

Canada

Obsolete Productions

Brazil

Obsolete Units

USA

Obstinacy

Brazil

Obuh Records

Poland

OCA Records

Spain

Occidental Records

United-Kingdom

Occult Antiquities

Canada

Occult Devotion

Germany

Occult Moon Records

Brazil

Occult Mountains Records

USA

Occult Records

Costa-Rica

Occult Roots Music

USA

Occult Sadism Records

Belgium

Occult Shop Productions

Italy

Occult Supremacy Productions

USA

Occult Whispers Records

USA

Occultelohim Productions

Mexico

Occultum

Italy

Occultum Productions

France

Occulture Records

USA

Ocean Records

USA

Oceanside Records

Italy