- Orion's Reign
- Osewoudt
- Onkel Zbyndas Winterrock
- Only a Mother
- O Graceful Musing’s Burden
- Owen
- Oldelaf
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- Othila
- omu-tone
- Olga Kharitidi
- Old Time Radio
- On the Rise
- OnDaMiKe
- 欧海
- Otis Gibbs
- Obscure Infinity
- 欧光劲
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- Orion
- One Dove
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- OrdinarySuperFamilyComputer
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- Outside
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- Outsmarted
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- One Hundred
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- On Broken Wings
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- Orlek
- 欧秋亭
- Ori Kaplan
- Oh The Larceny
- Olivia Trummer
- Operababes
- Ojas
- Official Secrets Act
- Owen Ear
