- Okkervil River
- Okki Nokki
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- Oku Onuora
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- Ola Horhe
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- Olafur Arnalds
- Olafur Arnalds & Alice Sara Ott
- Olafur Arnalds & Nils Frahm
- Olan Mill
- Olatunji
- Olavi Louhivuori
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- Old
- Old 97'S
- Old Baby
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- Oleksandr Yurchenko
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- Olli
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- Olten
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