- O
- OO
- OO
- OO
- OOak
- OakOb
- ObObl
- OblOC
- OCOce
- OCEOct
- OctOcu
- OcuOdd
- OddOdi
- OdiODZ
- OeOff
- OffOff
- Offogo
- ogoOh
- OhOHN
- OhnOje
- OjeOKA
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- Ols
- OmaOme
- OmeOmn
- OmnOna
- OnaOne
- OneONE
- Oneone
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpp
- OprORA
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrq
- OrqOrs
- OrsOru
- Osb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtt
- OttOty
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxa
- OxbOZ
- Oz
- ozz
- OCEANDVST (Greek pop-punk)
- oceanfromtheblue (Korean singer)
- oceanfromtheblue & Doohyuk, Jang
- Oceanhoarse
- Oceania (New Zealand, Hinewehi Mohi & Jaz Coleman)
- Oceania (Jeremy Cordonnier Trance prod.)
- Oceanic (90s UK pop group)
- Oceanic (Progressive metal band)
- Oceanic (DJ & producer Job Oberman)
- OceanLab
- OceanLab & Above & Beyond
- OceanLab feat. Emery, Gareth
- OceanLab feat. Suissa, Justine
- OceanLab vs. Emery, Gareth
- OCEANLANE
- Oceanless (Manchester based, Birmingham band)
- Oceano (American deathcore band)
- Océano de Sangre
- Oceans (Kiz aka Kiz Keyz)
- Oceans (post‐metal/metalcore)
- Oceans (Japanese band, group organized by Yuki Kurei)
- Oceans Above (Christian Worship Band)
- Oceans Ate Alaska
- Oceans Ate Alaska feat. Teyen, Alex
- Oceans Divide
- Oceans of Slumber
- Oceans of Time
- Oceans on Orion
- Oceans Red
- Oceans, The
- Oceanship
- Oceanside85
- Oceansize
- Oceanspeak
- Oceanus (future disco)
- Oceanus Orientalis
- Oceanus Orientalis & Mese, Idil
- Oceanwake
- Oceill
- Ocelotl
- Ocelots, The (Irish indie folk duo)
- Oceransky, Edgar
- Oceransky, Edgar & Ornelas, Raúl
- Oceransky, Edgar feat. Quesada, Bernardo
- ocete
- Ochaion, Kfir
- Ocher, Mary
- 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
- 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
- OCS
- OCS (dutch rapper)
- OCT
- Octafonic
- Octagon, Dr.
- Octagon, Dr. feat. Dexter
- Octahvia (US house/dance vocalist Octavia Lambertis)
- Octale (Belgian progressive metal band)
