- O
- OO
- OO
- OOas
- OatObl
- OblOce
- OceOck
- OckOda
- OdaODE
- ODEOes
- OetOff
- offO
- OGXOhi
- OhiOjo
- OjoOkl
- OklOlc
- OldOle
- OleOli
- OliOls
- OlsOma
- OmaOmn
- OmnOnc
- OncOne
- OneOne
- OneOnl
- OnlOOB
- OobOpe
- OpeOps
- OptOra
- OraOrc
- OrcORE
- OREOri
- OriOrl
- OrlOrq
- OrqOrw
- OrxOsc
- OscOsm
- OsmOte
- Oteott
- OttOui
- OuiOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOys
- OysOZZ
- Omarion feat. Brown, Chris & Jhené Aiko
- Omarion feat. Fabolous & Pusha T
- Omarion feat. Fauntleroy, James
- Omarion feat. Houston, Marques
- Omarion feat. Jay Rock
- Omarion feat. Jeremih
- Omarion feat. Kid Ink & French Montana
- Omarion feat. Mila J
- Omarion feat. Ross, Rick
- Omartian, Michael and Omartian, Stormie
- Omb (Israeli progressive/avant-garde metal band)
- OMB Bloodbath
- OMB Peezy
- OMB Peezy feat. Sada Baby
- OMB Peezy feat. TK Kravitz
- 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)
- OMDC
- 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 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)
- OMEGAH RED
- OmegaMode (f4f42739-441b-4c6f-8b23-ee7166d5cf01)
- Omegatypez
- Omelchuk, Alexey
- Omen (80's American metal group)
- Omen (Hungarian metal)
- Omen (Chicago rapper)
- Omens
- OmenXIII
- Omer Adam
- Omerettà the Great
- Omerta (Houston, Texas)
- Omesthesia
- OMFG
- OMG (Oh My Goodness, US rapper, Ice Cube's son)
- Omg Girlz, The
- 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)
- OMIDO (producer and songwriter)
- Omie Wise (Portuguese Band)
- Omiki (Psytrance)
- Omini
- Omino
- Ominous (Swedish melodic death/thrash metal band)
- Ominous (0minous)
- Ominous Eclipse (Canadian melodic death/thrash 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)
- Omloop, Laura (Belgian teen-pop singer)
- Omme Kolsoum
- Ommm (French vocal quintet group)
- Omnerod (Belgian progressive death metal)
- Omni (US lo-fi pop band from Atlanta)
- Omni Gardens
- Omni Selassi
- Omni Trio (drum and bass musician)
- Omnia (Neoceltic/Paganfolk)
- Omnia (trance producer Evgeny Smirnov)
- Omnia & Gallagher, Audrey
- Omnia & Ira
- Omnia & Ira
