Katalog wytwórni
- Ogoprod
- Ogun Recording Ltd.
- Oh Boy
- Oh Hellos
- Oh Many Music
- Oh Wow Dang
- Ohm Resistance
- Ohoo Music
- Ohr
- Oi! the Boat
- Oido
- Oihuka
- Oilworks Rec.
- Oim
- Ojo De Apolo
- Ojo De Mujer
- Ok
- Ok!Good
- Okami
- Okay Nature
- Okee Dokee Music
- Okeh
- Okehdokee
- Okimi
- Oklahoma Wind
- Oktav
- Okum Produzioni
- Ol' Buddy Records
- Ola
- Old Europa
- Old Europa Cafe
- Old Gramaphone Works
- Old Growth Records
- Old Hat
- Old School Flava
- Old Soul Music
- Old Technology
- Olde-Tyme
- Oldham Street
- Oldskool Johnny
- Ole
- Olindo Records
- Olive Films
- Oliveme Llc
- Olivi
- Olivia Newton-John
- Ollie Mob Worldwide
- Olnaro
- Olsen
- Olufsen
- Om Records
- Om Swagger Music
- Omac Records
- Omani Records
- Omarka
- Omcd
- Omdrom Music
- Omega Record Group
- Omega Records
- Omezis
- Omf
- Omn Label Services
- Omni
- Omni Sounds
- Omnibus Press
- Omnichord Records
- Omnium
- Omniverse
- Omnivore Recordings
- Omoa
- Omp Company
- On and On
- On High
- On High Records
- On Loop
- On Parole Productions
- On Stage
- On the
- On the Beach
- On the Camper
- On the Corner
- On the Fiddle
- On the Hill
- On the Level
- On the One
- On Track
- On Your Own Records
- On-U Sound
- On1 Entertainment
- Onaimusic
- Once
- Onde Italiane
- Onde Music
- Onderstroom
- Ondine
- One
- One & Only
- One Canada
- One Coin Records
- One Cool Jacso
