- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- OMB Peezy feat. King Von & Jackboy
- OMB Peezy feat. Sada Baby
- OMB Peezy feat. TK Kravitz
- Ombao, Dan
- Ombladon
- Ombladon feat. Cheloo & Freakadadisk
- Ombligo (Spanish folk band)
- Ombligo (Ombligomusica)
- OMBRE (Collaboration between Helado Negro and Julianna Barwick)
- Ombu
- OMC
- Omdat Het Kan Soundsystem (Belgian DJ Jasper Donkers & MC Average Rob)
- OMDC
- Ome (Dubstep Producer)
- Ome Henk
- Omega (Hungarian rock band)
- Omega (merengue mambo singer, aka “El Fuerte”)
- Omega (NWOBHM, formerly Apocalypse)
- Omega (Greek songs)
- Omega "El Fuerte" (Dominican merengue)
- Omega 3 (Dale Fairbairn, Steve Arnold, Jon Bell)
- Omega Crosby
- Omega Diatribe
- Omega Experiment, The (US progressive rock/metal band)
- Omega feat. JN3
- Omega Lithium
- Omega Nebula (dub duo)
- Omega Point, The
- Omega Sapien
- Omega Sin
- Omega Tribe (Japanese AOR band)
- Omega Vibes (Greek duo of Dimitris Panopoulos and Eva Tselidou)
- Omega Virus
- OMEGA X (South Korean boy group)
- Omega Zero (Italian progressive metal band)
- OMEGAH RED
- OmegaMode (dubstep producer William Gatliff)
- Omegatypez
- Omelchuk, Alexey
- Omen (80's American metal group)
- Omen (Hungarian metal)
- Omen (Chicago rapper)
- Omenbringer
- Omens
- OmenXIII
- Omer Adam
- Omerettà the Great
- Omerta (Lithuanian hip hop)
- Omerta (Houston, Texas)
- Omerta Beatz
- Omerta feat. Latvaitytė, Erika
- Omerta feat. Pashkius
- Omesthesia
- OMFG
- OMG (Oh My Goodness, US rapper, Ice Cube's son)
- Omg Girlz, The
- omgjo4Y!
- Omi (Israeli DJ/producer Omri Harpaz)
- OMI ("Cheerleader", Jamaican reggae/pop artist Omar Samuel Pasley)
- OMI feat. AronChupa
- 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)
