- O
- OO
- OO
- OOak
- OakOBG
- ObiObs
- ObsOce
- OceOct
- OctODD
- OddODE
- ODEOdy
- OdyOff
- OffOga
- OgaOh
- Ohohs
- OhtOK
- OKOko
- OkoOla
- OLAOld
- OldOli
- OliOli
- OliOls
- OlsOm
- OmaOmi
- OmiOn
- OnOne
- OneOne
- OneOne
- OneOnl
- OnlOob
- OobOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrd
- ORDOrg
- OrgORI
- OriOrl
- OrlOrq
- OrqOrt
- OrtOsa
- OsaOsc
- OsdOso
- OsoOte
- OteOtt
- OttOua
- OuaOut
- OutOut
- OutOut
- OutOve
- OveOvy
- OWOwl
- OwlOza
- OzaOZZ
- Octave Minds (Chilly Gonzales and Boys Noize collaboration)
- Octave Minds feat. Chance the Rapper & Social Experiment, The
- Octave Noire (formerly known as Oh Morice)
- Octave One (Burden brothers, US techno producers)
- Octave One feat. Saunderson, Ann
- Octaves (US hardcore band from Baltimore, MD)
- Octaves, Les
- Octavia (Bolivian pop)
- Octavia Sperati (Norse gothic metal band)
- Octavia Wakes
- Octavian (South-London based rapper)
- Octavian feat. ABRA
- Octavian feat. ASAP Ferg
- Octavian feat. J Rick & Ware, Jessie
- Octavian feat. London, Theophilus
- Octavian feat. Skepta & Phantom, Michael
- Octavian feat. Smokepurpp
- Octavian Ft. Future
- Octavian ft. Gunna & SAINt JHN
- Octavian ft. Phantom, Michael
- Octavian ft. Skepta
- Octavian Winters
- OCTAVIO
- Octavio Mai (French electronic/alternative duo of Juliette Bazenet and Johan Putet)
- Octavio the Dweeb
- Octavus Lupus (Symphonic metal band from Lieusaint, Île-de-France)
- octi
- Octinomos
- OCTiV
- OCTiV feat. Celldweller
- Octo Octa
- October 31 (US Heavy Metal)
- October Burns Black
- October Country
- October Dogs
- October Drift
- October Ends
- October Fall (piano-fueled pop punk band)
- October Falls (Finnish atmospheric black metal)
- October File
- October Light
- October London
- October Noir
- October Project
- October Rage
- October Sky
- October Tide
- Octobre (rock band from Quebec)
- Octobre Rouge (French rap group)
- Ôctôctô
- OctoLab
- Octopus (UK britpop group)
- Octopus (1970s German progressive rock group)
- Octopus (1970s Belgian pop band)
- Octopus (Progressive metal band from Chile)
- Octopus (1970s British psychedelic pop band)
- Octopus (1970s UK psychedelic rock band from Hatfield)
- Octopus Montage
- Octopus Project, The
- Octubre (spanish power-pop)
- OCULA
- OCULA feat. Tailor
- Oculist, The
- Oculos (Death/Thrash Metal band from Turkey)
- Oczojebny, Jakub
- OD Kokemus
- OD404
- ODA (Pop Singer)
- Oda (French stoner doom band)
- Oda, Kaori (KAORI for Yuki Kajiura)
- Oda, Kazumasa
- Oda, Tetsurou
- Oda, Yuji
- Odal (German pagan black metal band)
- Odani, Misako
- Odar (Bosnian Black Metal from Sarajevo)
- Odawas
- Odbicia, W Witrynach
- ODC (Modern Rock and Metal project created and led by Celia Do)
- Odd (Norwegian singer/songwriter Odd Nordheim)
- Odd (Filipino post-rock band from Dumaguete)
- Odd Advantage, The (Ska band from Hemet, California)
- Odd Beholder (Swiss pop duo)
- Odd Børre
- Odd Chap
- Odd Couple (house artist)
- Odd Couple (German garage rock band)
- Odd Couple, The (US hip-hop duo Louis Logic & Jay Love)
- Odd Crew
- ODD EYE CIRCLE (South Korean girl group)
