- Orfeon Gagarin
- Orfeus
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- Organic
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- Organic Is Orgasmic
- Organic Quartet
- Organisation Toth
- Organization
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- Organized Sports
- Orgasmic&Fuzati
- Orgasmo Sonore
- Orgel Vreten
- Orgone
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- Origin One
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- Original Cast Recording
- Original Cast, Pet Shop Boys And Jonathan Harvey
- Original Five Blind Boys
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- Original Three
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- Oriol
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- Ornamento Y Delito
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- Orne
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- Ornette -quartet- Coleman
- Ornette Coleman
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- Oscar -jr.- Brown
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- Oscar Brown Jr
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- Oscar Peterson Trio
- Oscar Pettiford
- Oscar Pettiford Quartet
- Oscar Pettiford&Friend
- Oscar Sulley
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- Oscillation
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