- O
- OO
- OO
- OO
- OOAF
- OAFOak
- OakObe
- ObeObo
- OboOca
- OcaOce
- OceOct
- OctOct
- OctOdd
- OddODE
- ODEOds
- OdsOf
- ofOff
- OffOfM
- OfMOgr
- OgrOH
- OhOhN
- OHOOje
- OjeOKA
- OKAOkt
- OktOla
- OlaOld
- OldOl
- OlOlg
- OlgOli
- OliOli
- OliOls
- OlsOma
- OmaOmb
- OmbOmi
- OmiOn
- OnOnC
- OndOne
- OneOne
- OneONE
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOp
- OpeOpo
- OpoOqu
- OquORA
- ORAOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrl
- OrlOrp
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- Orqort
- OrtOs
- OsOsc
- OscOsi
- OsiOsp
- OspOsw
- OszOti
- OtiOtt
- OttOtw
- OtwOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOwa
- OwaOwl
- OwlOxl
- Oxl
- Ozu
- Ozuozz
- Omission (Dutch hardcore band, active 2003 - 2007)
- Omit (melodic doom metal band based in Oslo, Norway)
- Omkara (New Age musician/singer/songwriter Lauren Piazza)
- Omkara Techichi
- omlet (indie pop musician)
- Omloop, Laura (Belgian teen-pop singer)
- Omme Kolsoum
- Ommm (French vocal quintet group)
- Omnerod (Belgian progressive death metal)
- Omni (Los Angeles rapper J. McDonald)
- Omni (French pop/rock)
- Omni (US lo-fi pop band from Atlanta)
- Omni Gardens
- Omni Selassi (Swiss experimental rock)
- Omni Trio (drum and bass musician)
- Omnia (Neoceltic/Paganfolk)
- Omnia (trance producer Evgeny Smirnov)
- Omnia (italian rock band)
- Omnia & Gallagher, Audrey
- Omnia & Ira
- Omnia & Ira
- Omnia feat. Burns, Christian
- Omnia feat. Everything by Electricity
- Omnia feat. Loretta, Melissa
- Omnia feat. Nadeau, Danyka
- Omnia feat. Rose, Jonny
- Omnia feat. Wrigsell, Tilde
- Omniblank
- omniboi
- omniboi feat. Fantasyluv
- omniboi feat. Zeph
- Omnific, The
- Omnific, The ft. Gober, Clay
- Omniflux
- Omnikrom
- Omnikrom ft. TTC
- Omnimar
- Omnimotion
- Omnioid
- Omnipotence (Canada / Death/Black Metal)
- Omnis (ambient / drone)
- Omniscient (Indian technical death metal band)
- Omnisoul
- Omnispawn
- Omnitica
- Omnitron (Thrash Metal band from Sweden)
- Omnium (Australian death metal)
- Omnium Gatherum
- Omnivalent (Houston, TX Rock/Alt-Rock band)
- Omnivide
- Omnivortex
- OMNOM (Tech House artist)
- Omnyama, Mfaz'
- Omodaka
- Omodaka (Soichi Terada)
- Omodaka
- OMOH (Pop electro french duo)
- Omoi (Sakurai & Kimura)
- Omoinotake
- Omole, Faith
- Omonoko (Northern Irish Alt pop quartet)
- Omoregie, Allen (Nigerian Gospel singer)
- OMORI (Composers of the video game soundtrack “Omori”)
- Omori, Aki
- Omori, Cullen
- Omori, Hinako
- Ōmori, Toshiyuki
- Omosumo
- Omoto, Trevor & UNDY
- Omotola
- OMP
- Omp El Capitán (Dominican Christian music singer)
- OMR (Paris-based French Rapper)
- Omraz (Bulgarian Extreme Metal Band)
- Omri (emo electro)
- Oms, Kuba (Canadian soul singer and producer)
- Omul cu Șobolani
- Omulu & DUDA BEAT
- Omulu & Letrux
- Omulu & Maria Maud
- Omulu + King Doudou
- Omulu, DUDA BEAT & Lux & Tróia
- Omulu, Luna, Luedji & ÀTTØØXXÁ
- OMY, The
- OMYRA & Rubin, Josh
- ON (Sylvain Chauveau and Steven Hess with rotating guest artists)
- ON (solo project of Ken Andrews)
- ON (Hardcore)
- on a créé un monstre
- On a Dead Machine
