O Records
O Records, Hispavox
O.R.S.
Oasis
Ode Records
Odeon
Odeon, EMI Italiana S.p.A.
Odeon, Fame
Odeon, HÖR ZU
Off The Track Records
Official Record Company
Ogun
Ohlone
Ohr
Ohr, Kosmische Musik
Ohrwaschl Records
Ohrwurm-Records
Ojee
OK-Musica
Old Europa Café
Old Europa Cafe, Misty Circles
Olympo
Omega International
On Stage Records
On The Road
One Little Indian
One Way Static Records
Opal Records
Opera
Optimism Inc
Opus
Orbis
ORFEO
Orfeu
ORG Music
Original Jazz Classics, New Jazz
Orion
Orizzonte
Orlando International Shows
Orlando, Carrere
Orpheus Records
Oscar Records
Osmose
Other Voices Records
Our Choice
OUT
Out Of Line
Outline Records
Ovation Records
Overseas Records
Overseas Records/Ariola/Teichiku Records
Overseas Records/Utopa/Teichiku Records
Oxford
Oxford, Charly Records
Oyster
