- Operetta Che Passione!
- Operette
- operiod
- Opernchor Der Hochschule Für Musik Köln
- Opernchor Des Saarländischen Staatstheaters
- Opeth
- O.P.E.X.
- Opeye
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- Ophelia Rising
- Ophelia Rising
- Ophelia Swing Band
- Ophelia Syndrome
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- Ophelia's Innocence
- Ophelia's Kiss
- Ophelia's Looking Glass
- Ophelia's Sweet Demise
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- Opie Bellas
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- Opie Gone Bad
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- o.pinion
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- Opir