Artists by alphabet

• O F F love
• O Yuki Conjugate
• O. Children
• O.L.D.
• Oathbreaker
• Obscenity Trial
• Obsidia
• Occul
• Octavia Sperati
• October Falls
• Odessa
• Odroerir
• Of a Mesh
• Officium Triste
• OffLimits
• OhGr
• Oil in the Eye
• Okk▼l† K▲††
• Ola Mesh
• Old Swan Band
• Omdulö
• Omega Lithium
• Omnia
• On The Floor
• On Thorns I Lay
• One-Eyed Doll
• OneCyze Project
• Oneiroid Psychosis
• Oniric
• Onyria
• Oomph
• Oomph!
• oOoOO
• Open Ocean
• Opéra de Nuit
• Opera IX
• Opera Multi Steel
• Opeth
• Ophelia'S Dream
• Ophelia’s Dream
• Opium Den
• Oracles
• Orange Juice
• Orange Sector
• Orchestral Manoeuvres in the Dark
• Ordo Equitum Solis
• Ordo Rosarius Equilibrio
• Orgy
• Orphanage
• Orphex
• Orplid
• Ost+Front
• Ostara
• Ostfront
• Ostia
• Otep
• Other Day
• Otras Voces
• Otto Dix
• Ougenweide
• Our Time Down Here
• Oval
• Overgament
• Ozric Tentacles