- O Bando Do Velho Jack
- O Caiman Do Rio Tea
- O CĂrculo
- O Children
- O Connor
- O Rappa
- O Teatro Magico
- O-town
- O-two
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- Oag
- Oak And Gorski
- Oak Ridge Boys
- Oaks Worship
- Oar
- Oasis
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- Oathbreaker
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- Obb
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- Obie Bermudez
- Obituary
- Objek Bulat
- OBK
- Obliterations
- Obliveon
- Oblivion
- Oblivion Dust
- Obojeni Program
- Obrint Pas
- Obrother
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- Observer Drift
- Obtenebris
- Obtest
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- Oc Supertones
- Ocasek Ric
- Ocaso 2012
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- Occipitool
