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• O Genesis
• O. Gudmundsen Minde
• O-Town Music
• Oaken Palace Records
• Observatoire
• Obskyr
• Obsolete Future
• Obsolete Units
• OBUH Records
• Ocora
• October Editions
• Octpia
• Officina Fonografica Italiana
• Oehms Classics
• OFFRANDES
• Offset Records
• OHN
• Okeanos Productions
• Old Captain
• Old Europa Cafe
• Old Heaven Books
• Old Mill
• Olde English Spelling Bee
• Olinkan
• Ormo Records
• Oltrarno Raw
• Oltrelanebbiailmare
• Omlott
• Olof Bright
• Om Ha Sva Ha Ksha Ma La Va Ra Yam
• Ominous Recordings
• Omnempathy
• Omnimemento
• Oms-b
• OnderStroom Records
• One Point Life
• Opal Tapes
• Opax Records
• Open Mouth
• Optical Sound
• Optimo Music
• OR
• Oral
• Orange Mountain Music
• Organ Reframed
• Organized Music From Thessaloniki
• Orgasm
• Orgel Fesper Music / Twin Tub & Beaver
• Orila
• Orpheus The Pantomime
• oscarson
• OSR Tapes
• Oryx_ Records
• Other Minds
• Other Voices Records
• Otobin
• Otomatik Muziek
• Otooto
• Otoroku
• OTP
• Ouidah
• Our Mouth Records
• Our Swimmer
• OUTERDISK
• Otototori
• Out Loud Records
• Outer Realm Records
• OVO
• Oxen
• Oxidation
• OYC Limited