- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- oblObs
- ObsOce
- OceOch
- OchOCT
- OctODC
- ODCOdd
- OddOde
- OdeODU
- ODUof
- ofOFF
- OffOFK
- OfMOgr
- OgrOh
- OhOhi
- OhiOim
- OimOK
- OKOke
- OkeOl
- OlOl
- OlaOld
- OldOle
- OleOlg
- OlgOli
- OliOli
- OliOls
- OlsOma
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneOnk
- OnkOno
- OnoOny
- OnyOos
- OosOpe
- OpeOPL
- OPMOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriORK
- OrkOro
- OroOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOSK
- OskOss
- OssOta
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOza
- OzaOzo
- OzoOzz
- Ocher, Mary
- Ocher, Mary & Steer, Serafina
- Ocher, Mary & Your Government
- Ocher, Mary + Your Government
- Ocher, Mary feat. Steer, Serafina
- Ocher, Mary feat. Your Government
- Ochman (Polish singer-songwriter Krystian Ochman)
- Ochman & @Atutowy
- Ochman, Avi & @Atutowy
- Ochmoneks (from Düsseldorf Germany)
- Ocho Macho
- Ocho Sneak
- 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 (Scottish post-punk band)
- Ochs, Conny
- Ochs, Larry
- Ochs, Phil
- Ochumare Quartet
- Ochunism
- Ocie Elliott
- Ócio (Brazilian rock band)
- Ock, Sam
- Ockeghem, Johannes (Franco-Flemish early Renaissance composer)
- Ockeroid
- Ockert, Darren
- Ockney
- Ockney & Krimophonik
- OCN
- Ocno
- OCnotes
- Oco Yajé
- oco.
- Ocote Soul Sounds
- Ocote Soul Sounds & Quesada, Adrian
- Ocote Soul Sounds and Quesada, Adrian
- OCS
- OCS (dutch rapper)
- OCT
- Octa Push
- 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 Band, The
- 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 (chiptune covers)
- Octavia Sperati (Norse gothic metal band)
- Octavia Wakes
- Octaviagrace
- 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
