- O. Children
- O2L
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- Oaks Mary
- Oasis
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- Обморок И Мама
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- Obsidian Gate
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- Обійми Дощу
- Ocarinah
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- Oda
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- Off
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- Of Machines
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- Олег Анофриев
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- Олександр Пономарьов
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- Orna
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- Othyrworld
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- OTTOTTRIO
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- Озоновый Слой
- Ozric Tentacles
- О.з.у.
- Ozz
- Ozzy & Kelly Osbourne
- Ozzy Osbourne