- O
- OO
- OO
- OOak
- OakOb
- ObeObo
- OBOOce
- OceOch
- OchOct
- Odd
- OddODM
- ODOOf
- OfOff
- OFFOgr
- OgrOh
- OhOIR
- OirOKA
- OkaOku
- OkuOla
- OlaOld
- OldOli
- OliOli
- OliOls
- OlsOMA
- OmaOme
- OmeOmo
- OMPOnd
- One
- OneOne
- OneOni
- OniOno
- OnoOom
- OomOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrc
- OrcOrg
- OrgOri
- OriOrk
- OrkOrp
- OrpOrr
- OrrOrv
- OrvOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOue
- OugOut
- OutOut
- OutOut
- OutOve
- OveOVR
- ovrOwl
- OwlOxx
- OxyOZR
- ozz
- Omen (Hungarian metal)
- Omen (Chicago rapper)
- Omenbringer
- Omens
- OmenXIII
- Omer Adam
- Omerettà the Great
- Omerta (Lithuanian hip hop)
- Omerta (metalcore band from Houston, TX)
- Omerta Beatz
- Omerta feat. Latvaitytė, Erika
- Omerta feat. Pashkius
- Omesthesia
- OMFG
- OMFG (Dave Owens)
- OMG (Oh My Goodness, US rapper, Ice Cube's son)
- OMG Girlz, The
- omgjo4Y!
- OMI ("Cheerleader", Jamaican reggae/pop artist Omar Samuel Pasley)
- Omid (hip hop producer Omid Walizadeh)
- Omid (Iranian singer)
- Omid (released Life of Omid)
- Omid Shabani
- OMIDO (producer and songwriter)
- Omie Wise (Portuguese Band)
- Omiki (Psytrance)
- Omini
- Omino (Argentinian electronic rock)
- Ominous (Swedish melodic death/thrash metal band)
- Ominous (0minous)
- Ominous Eclipse (Canadian melodic death/thrash metal)
- Ominous Glory (USA power metal)
- Ominous Ruin (USA technical brutal death metal)
- Ominum
- Omission (Dutch hardcore band, active 2003 - 2007)
- Omit (melodic doom metal band based in Oslo, Norway)
- Omkara (New Age musician/singer/songwriter Lauren Piazza)
- 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 & Gallagher, Audrey
- Omnia & Ira
- Omnia feat. Burns, Christian
- Omnia feat. Loretta, Melissa
- Omnia feat. Nadeau, Danyka
- Omnia feat. Rose, Jonny
- Omnia feat. Wrigsell, Tilde
- omniboi
- omniboi feat. Fantasyluv
- omniboi feat. Zeph
- Omnific, The
- Omnific, The ft. Gober, Clay
- Omnihility
- 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 Gatherum
- Omnivide
- Omnivortex
- OMNOM (Tech House artist)
- Omnyama, Mfaz'
- Omodaka
- Omodaka (Soichi Terada)
- OMOH (Pop electro french duo)
- Omoinotake
- Omonoko (Northern Irish Alt pop quartet)
- OMORI (Composers of the video game soundtrack “Omori”)
- Omori, Cullen
- Omori, Hinako
- Ōmori, Toshiyuki
- Omosumo
- Omotola
