- O
- OO
- OO
- OO
- OOak
- OakOat
- OatObi
- ObiObs
- ObsOce
- oceOch
- OchOct
- OctOdd
- OddODE
- ODEOdo
- OdoOf
- OfOFF
- OffOfi
- OFKOgr
- OgrOh
- OhOht
- OhtOjo
- OjoOka
- OkdOku
- OkuOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOls
- Olsom
- OmOMB
- OMBOmi
- OmiOn
- OnOnd
- OndOne
- OneOne
- Oneone
- ONEOni
- ONJOno
- OnoOob
- OOcOpa
- OpaOpe
- OpOpp
- OprOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriOrl
- OrlOrp
- OrpOrq
- OrqOrt
- ortOs
- OsOsc
- OscOsk
- OskOss
- Ossota
- OtCOto
- OtoOtt
- OttOui
- OuiOus
- OusOut
- OutOut
- OutOv
- OvOve
- OveOvi
- OviOwe
- OweOxf
- OxfOza
- OzaOZR
- ozz
- Ochman (Polish singer-songwriter Krystian Ochman)
- Ochman & @Atutowy
- Ochman, Avi & @Atutowy
- Ochmoneks (from Düsseldorf Germany)
- Ocho
- Ocho Macho
- Ocho y Media
- Ochoa, Amparo
- Ochoa, Calixto
- Ochoa, Eliades
- Ochoa, Eliades & Blades, Rubén
- Ochoa, Eliades y el Cuarteto Patria
- Ochoa, Kelvis
- Ochoa, María Inés
- Ochoa, Mario (Colombian DJ & producer)
- Ochoa, Rolando
- Ochobre
- Ochre (electronic musician Christopher Leary, UK)
- ochre (Scottish post-punk band)
- Ochs, Conny
- Ochs, Phil
- Ochsenknecht, Uwe
- Ochunism
- Ocie Elliott
- Ócio (Brazilian rock band)
- Ock, Sam
- Ockeghem, Johannes (Franco-Flemish early Renaissance composer)
- Ockeroid
- Ockert, Darren
- Ockham’s Razor (folk rock quartet based out of Seattle)
- Ockney
- OCN
- OCnotes
- oco.
- Ocote Soul Sounds
- Ocote Soul Sounds & Quesada, Adrian
- Ocote Soul Sounds and Quesada, Adrian
- OCS
- OCS (dutch rapper)
- OCT
- Octafonic
- Octagon, Dr.
- Octagon, Dr. feat. Dexter
- Octahvia (US house/dance vocalist Octavia Lambertis)
- Octale (Belgian progressive metal band)
- Octane (Philadelphia hard rock band)
- Octane & DLR
- Octane & DLR feat. Marion
- Octappella (United States contemporary a cappella)
- Octarium
- Octava Dimesión, La (Colombian salsa group in the 1980s/90s)
- Octavarium
- Octave (Iranian Band)
- Octave Cat
- Octave Lissner
- Octave Minds (Chilly Gonzales and Boys Noize collaboration)
- Octave Minds feat. Chance the Rapper & Social Experiment, The
- Octave Noire (formerly known as Oh Morice)
- Octave One (Burden brothers, US techno producers)
- Octave One feat. Saunderson, Ann
- Octaves (US hardcore band from Baltimore, MD)
- Octaves, Les
- Octavia (Bolivian pop)
- Octavia Sperati (Norse gothic metal band)
- Octavia Wakes
- Octavian (South-London based rapper)
- Octavian feat. ABRA
- Octavian feat. ASAP Ferg
- Octavian feat. J Rick & Ware, Jessie
- Octavian feat. London, Theophilus
- Octavian feat. Skepta & Phantom, Michael
- Octavian feat. Smokepurpp
- Octavian Ft. Future
- Octavian ft. Gunna & SAINt JHN
- Octavian ft. Phantom, Michael
- Octavian ft. Skepta
- Octavian Winters
- OCTAVIO
- Octavio Garcia
- Octavio Mai (French electronic/alternative duo of Juliette Bazenet and Johan Putet)
- Octavio the Dweeb
- Octavus Lupus (Symphonic metal band from Lieusaint, Île-de-France)
- octi
- Octinomos
- OCTiV
- OCTiV feat. Celldweller
- Octo Octa
- October 31 (US Heavy Metal)
- October Burns Black
- October Country
