- Olivia Anna Livki
- Orphan Songs
- 欧阳佩珊
- OutaMatic
- Omar Garcia
- Obscurus Advocam
- Olialia pupyčių
- Ozzie Ahlers
- Old & In the Gray
- Ocuto
- Oceans
- Okolokolo
- Original Silence
- Oisin
- Oceans Upon Us
- Ohm
- 欧阳靖&Stacie Bollman
- Once A Day
- Oracle Sun
- 欧翠峰
- Oblivion
- Otherflow
- Obsidian
- Opera Magna
- Ohio
- Other Side of Morning
- Omasphere
- Otter Petter
- Offcutts
- Only Living Witness
- Oliver Strauch Trio
- Oscar Dunbar
- Outburst
- Oliver Swain
- OMB
- O! The Joy
- Our Lady Peace
- Octobop
- Oedo Kuipers
- Opposite Exhale
- Osvaldo Chacón
- Oleg Butman
- Ossatura
- Oliver
- Old Bear
- Off Land
- Oaktown Irawo
- Orla Fallon
- Omar Apollo
- ok-one
- October Game
- Othala
- Office
- Omar Pedrini
- Orlando Dixon
- Oddeye
- O.kang
- offonoff
- Onuinu
- Oakhelm
- Oraison
- Our Crooked Teeth
- Odradek Room
- Outsmarting Simon
- OCEANLANE
- Out of Yesteryear
- Orwell
- Ongaku Gatas
- Orlog
- Olympic Cyclone Band
- Ondrej Pivec
- Open Road
- Orquesta Charangoa
- October Faction
- Ormatie
- Otis Blackwell
- Orenda
- ONE PROMISE
- Old Man Canyon
- O Pioneers!!!
- Oleg Serkov
- Optimystical
- OLAibi
- Ofelia K
- Oli Silk
- O.Ro.Thy
- Organoid
- Oscar Enestad
- Otto Lechner
- Outra-G
