- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObs
- ObsOce
- OceOch
- OchOct
- OctODD
- OddOde
- OdeOdi
- OdiODY
- OdyOfe
- OfeOff
- OffOG
- OGOGX
- OhOh
- OhOhN
- OHOOja
- OjaOka
- OkaOkl
- OklOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOlm
- OlmOlu
- Oma
- OmaOme
- OmeOmn
- OmnOn
- OnOnd
- OndOne
- OneOne
- Oneone
- OneOni
- OniOnl
- OnlOnw
- OnwOon
- OoOOpe
- OpeOph
- OpiOpu
- OpuOra
- OraOrb
- OrbOrc
- Orcorc
- orcOre
- OreOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrp
- OrpOrq
- OrqOrt
- OrtOsa
- OsaOsc
- OscOsi
- OsiOso
- OsoOsv
- OsvOth
- OthOts
- OtsOtt
- OttOur
- OurOut
- OutOut
- OutOUT
- OutOv
- OvOVE
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOzb
- Ozb
- Ozuozz
- Onward to Olympas
- Onward, etc.
- Onyanko Club
- Onyeabor, Charles
- Onyeabor, William
- Onyioha, Oby
- Onyria (Oniria)
- Onysus
- ONYVAA
- Onyx (New York hardcore rap group)
- Onyx (Israeli psytrance DJ Yaniv Goldfarb)
- Onyx (IDM artist, track "Under Pressure")
- Onyx & Dope D.O.D.
- Onyx Collective
- Onyx feat. ASAP Ferg & Price, Sean
- Onyx feat. DMX
- Onyx feat. Dope D.O.D.
- Onyx feat. Genovese
- Onyx feat. Havoc
- Onyx feat. Makem Pay
- Onyx feat. Papoose & Cormega
- Onyx feat. Reks
- Onyx feat. Snak the Ripper
- Onyx feat. X1
- Onyx, PTX & Domestic
- Onza (Spanish prog and fusion band)
- Onza (Spanish rock band.)
- Onze‐Mots
- Onze:20
- ONZY
- OOBE (Italian techno/house producer)
- OOBE (Polish Rock Band)
- Ooberfuse
- Ooberman
- Oobik & the Pucks
- OOcarpet (South Korean band)
- Oodaredevil (Yeat collaborator aka DareDevil)
- ooes
- ooes, Pantera Blue
- oofoe
- Oogie
- Ooh La La
- Oohashi, Takuya
- Oohlas, The
- OOHYO
- ooi (German indie pop band)
- Ooi, Imee
- OOJA, Ms. (hiphop)
- OOJA, Ms. feat. LATINO, EL
- Oojami
- Ookay
- Ookay & Byers, Piper
- Ookay & Cesqeaux
- Ookay & Chime
- Ookay & JSTJR
- Ookay & Linney
- Ookay & Sinjin
- Ookay & Stevenson, Fox
- Ookay & YDG
- Ookay feat. Byers, Piper
- Ookay feat. Renee, Bella
- Ookay feat. Vance, David
- Ookla the Mok (filk group)
- Ooklah the Moc
- Öökülm
- Oolacile
- Oolacile feat. Code: Pandorum
- Oolong (LI emo)
- oomiee
- Oomori, Kinuko (Japanese singer)
- Oomori, Seiko (Japanese pop/rock singer-songwriter)
- Oomph!
- Oomph! feat. Apocalyptica
- Oomph! feat. Harms, Chris
- Oomph! feat. Jandová, Marta
- Oomph! feat. Kieß, Stephanie
- Oomph! feat. L'ÂME IMMORTELLE
- Oomph! feat. L’Âme Immortelle
- Oomph! feat. Sharon den Adel
- Oompie Koerier
- Oona (Graphic artist born Oona Leganovic)
- Oona (Oona Garthwaite and Dave Tweedie)
- OONA. (P-Pop Girl Group)
- Oonagh (Senta-Sofia Delliponti)
- Oonagh & Santiano
- Oonagh feat. Björn
- Oonagh feat. Celtic Woman
- Oonagh feat. Fischer, Helene
- Oonagh feat. Safri Duo
- Oonagh feat. Santiano
