Ostatnie Tchnienie

Poland

Ostfront Produktion

Germany

Ostra Records

France

Ostrogothia Productions

Sweden

OSW Prods

Paraguay

Otcrah Records

Mexico

Othal Productions

Russia

Other Ear Music

USA

Other Electricities

USA

Other People Records

USA

Other Peoples Music

Canada

Other Records

United-Kingdom

Other Room Productions

USA

Otherness

unknown

Others Underground

Japan

Oto Records

Japan

Otokura Record

Japan

OTOW

Germany

OTR Productions

Germany

Otsego Entertainment Group

unknown

OTT Records

USA

Otter Records

Germany

Otto Produktzionne

France

Otvar

Russia

Oud Bos Records

Netherlands

Ouergh Records

United-Kingdom

Ouga Booga And The Mighty Oug Recordings

Greece

Oui Oui Records

Argentina

Oupiric Productions

Russia

Our Ancient Future

USA

Our Area

Germany

Our Blood Records

USA

Our Choice

Germany

Our Dark Lord Crondor Productions

unknown

Our First Record Company

USA

Our Own Records

USA

Our Records

unknown

Our Voice Records

Portugal

Our World Records

Germany

Ouro Preto Productions

USA

Out From The Dark Recordings

unknown

Out Of Enslavement Records

Canada

Out Of Line Music

Germany

Out Of Majors

unknown

Out Of Season

USA

Out Of Step Records

Brazil

Out Of The Box Records

unknown

Out Of The Dungeon

Finland

Out Of This Work Records

unknown

Out Of Time

unknown

Out On A Limb Records

Ireland

Out Rage Productions

Spain

Out Ta Bomb Records

Japan

Out There Records

Portugal

Outbreak Records (JAP)

Japan

Outbreak Records (UK)

United-Kingdom

Outer Battery

USA

Outer Circle Records

unknown

Outer Himalayan Records

United-Kingdom

OuterLoop Records

USA

Outersound Music

Ireland

Outlanders Productions

Finland

Outlast

unknown

Outlast Records

unknown

Outlaw Entertainment

Canada

Outlaw Label

unknown

Outlaw Recordings

USA

Outlaw Records

United-Kingdom

Outlet Records

Unknown

Outline Records

Spain

Outline Rekordz

Germany

Outono Music

Brazil

Outpost Recordings

USA

Output Music

Belgium

Output Records

Germany

Outrageous Defecation Records

Canada

Outrageous Weeb Power Productions

USA

Outsanes Records

Germany

Outsider Music Records

unknown

Outsider Records

United-Kingdom

Outsider Records (Bootleg)

Unknown

Outstanding Records

United-Kingdom

Outta Space Records

Germany

Outvillage Records

Sweden

Ovation Records

USA

OVC Media

unknown

Ovchi Recordings

unknown

Oveja Negra

Chile

Ovejero Records

Spain

Over Records

United-Kingdom

Over The Edge Recordings

France

Over The Under Records

Denmark

Overcome Records

France

Overcore

USA

Overdose On Records

USA

Overdrive (ESP)

Spain

Overdrive (NL)

Netherlands

Overfiend Records

unknown

Overflesh Records

Argentina

OverGhost Records

unknown