Label » O
- Objet-a
- Oblivion Dip
- Obscène Et Anémique
- Ocean Floor
- Ochre
- Ochre Records
- Odd Size
- Off-Kilter
- Oh My World
- Olaf Ladousse
- Old Bicycle Records
- Old Europa Cafe
- Old Europe Cafe
- Olde English Spelling Bee
- Ole Records
- Olof Bright
- Oloj Records
- Oltrarno
- Oma333
- Omnidisc
- OnderStroom Records
- Ongehoord
- Onibaba
- Onomatopee
- ONPA)))))
- OOH-sounds
- Opa Opa
- Opal Tapes
- Open Circuit
- Optical Sound
- Opuntia Books
- OR
- Oral
- Orbis Pictus Club
- Ordia Muszc
- Ordo Viatorum
- Orient Press
- Oriental Music
- Orphax
- Orre
- Orthlorng Musork
- Oska Wald
- Ostblock Records
- Other Ideas
- Otomatik Muziek
- Otoroku
- Otto Splotch
- Out One Disc
- Outsider Records
- Overclockheadz
- Ozonokids
