- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOCE
- OceOct
- octOdd
- OddOdi
- OdiOf
- OfOff
- OffOh
- ohohG
- OhgOji
- OJMokh
- OKIOla
- OlOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnOnb
- OncOne
- OneOne
- OneOni
- ONJont
- OntOos
- OotOph
- OphOR
- OrOrb
- OrbOrc
- OrcORE
- OreOri
- OriOrl
- OrlOrp
- OrpOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOye
- Ozy
- OzzOZZ
- One‐T + Cool‐T
- One‐T + Cool‐T
- One‐Two‐Three (concept group with Bobby Orlando)
- One, Albert
- One, Andrew
- One, Audio
- One, Peter (African folk artist)
- One, Player (Synthwave)
- One, Res
- One, The (Hip Hop Artist)
- One, The (boyband "One More Chance")
- ONE: A Worship Collective
- One11Twenty
- ONEDEFINED (Dutch-born techno producer with Moroccan roots)
- Oneeva
- onefive
- onefour (Drill Group from Western Sydney)
- Onefour (sydney rapper)
- OneFromTheNorth
- Oneheart (Russian lo‐fi, phonk, wave and ambient beatmaker)
- onehundredhours
- Oneida (experimental rock band from Brooklyn)
- Oneil
- Oneil (Russian Artist)
- Oneiroid Psychosis
- onelinedrawing
- Onelinedrawing
- OneMic
- Oneness Darkness (Goth industrial metal band)
- Oneness of Juju
- oneohkay (Artist associated with artbyFORM)
- Oneohtrix Point Never (Daniel Lopatin, commonly abbreviated OPN)
- Oneohtrix Point Never & ROSALÍA
- Oneohtrix Point Never feat. Pop, Iggy
- OnePhatDeeva
- ONEPIXCEL
- oneproudmonkey
- OneRepublic
- OneRepublic & Alesso
- OneRepublic & Seeb
- OneRepublic feat. Amir
- OneRepublic feat. Cassius
- OneRepublic feat. Gabriel, Peter
- OneRepublic feat. Santigold
- OneRepublic feat. Timbaland
- OneRepublic vs. Alesso
- Ones You Forgot
- Ones, The (US EDM band)
- Onesa, Paolo
- OneSideZero
- Onestar (former member of Monday Kiz)
- Onete, Dona
- Onething Live (Live Recordings from Onething Conference)
- Onetwo (synthpop duo Claudia Brücken & Paul Humphreys)
- OneUp Studios
- OneUps, The
- ONEUS
- OneVoice Gospel Choir
- ONEW
- ONEWE
- ONEWE & ONEUS
- Oneworld (Dave Randall & friends)
- OneWorld (Current Solo project Sander van der Waal)
- Onexx (Crossover Band from Bonn, Germany)
- Oney (hard rock)
- Öney, Feryal
- ONF
- Ong, Daryl
- Ong, Olivia
- Ongala, Remmy & Orchestre Super Matimila
- Ongoing Concept, The
- Onheil (Dutch blackened/melodic thrash/death metal)
- ONI (Canadian Progressive Metal Band)
- Oni Cea$
- ONI INC.
- Oni Rock (Brazilian rock band)
- Onike, Abdul
- Onile, Marie
- Onion Flavored Rings
- ONIONRING (Japanese rock band)
- Onionz
- Onirama
- Oniric (Italian dark folk duo)
- Onirismo
- Onis, Manuel
- Onishi, Junko, Trio
- Onision
- Onitsuka, Chihiro
- Ónix Ensamble (Mexican chamber music group)
- Oniyama, Josephine