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- Opeth
- Orphaned Land
- Osbourne Ozzy
- OOMPH
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- Output
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- Offspring The
- Onose Jun
- Octavia
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- Ona
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- Orgy
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- One Dollar Short
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- Omega
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- Otro Yo El
- Obus
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- October Falls
- Overflow
- Old Dead Tree The
- Obsidio
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- Obrint Pas
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- Oficina G3
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- Opiosos Os
- Ostria Marcelo
- Orchestral Manoeuvres In The Dark Omd
- Obligation Or Reputation
- Oleander
- Osvajaci
- Oxidus
- Obispo Pascal
- Outlaw Torn The
- Ozric Tentacles
- Oleyire
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- Oreja De Van Gogh La
- Old Man Willow
- Office Of Strategic Influence
- Ogres De Barback Les
- October Thorns
- Offenbach Jacques