O-5
- Over Kill
- Over Sands
- Overcoats
- OverDoz
- Overflow
- Overground
- Overgrown
- Overload Generation
- Overlorde
- Overly Attached Girlfriend
- Overmars
- OverMaster
- Overmood
- Overnight Classic
- Overnite
- Overprivileged (The)
- Overstreet
- Overtake
- Overthrow
- Overture Black
- OverUnder (The)
- Overwerk
- Ovidi Montllor
- Ovidiu Anton
- Ovila Légaré
- Ovlov
- Ovy On The Drums
- Owais
- OWEL
- Owen Benjamin
- Owen Campbell
- Owen Danoff
- Owen Ovadoz
- Owen Temple
- Owl
- Owl City
- Owl John
- Owl Paws
- Owlle
- Owls
- Owls By Nature
- OWS
- Oxana
- Oxford Collapse
- Oxford Drama
- Oxi
- Oxia
- Oxide & Neutrino
- Oxmo Puccino
- Oxmo Puccino feat. K-reen
- Oxo 86
- Oxygen
- Oxygene
- Oxymoron
- OY
- Oyann
- Oystar
- Oyster Prairie
- Oysterband (The)
- Oz Noy
- Ozan
- Ozan Doğulu
- Ozark Henry
- Ozi Noor
- Oziel Popoca
- Ozkar Zulu
- Ozma
- Ozomatli
- Ozuna
- OZVN
- Ozz - 01
- Ozzie Nelson
- Ozzy Osbourne
- OZZY OZBOURNE
