- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblOBS
- ObtOce
- OceOch
- ochOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OGBOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- okaOku
- OkuOla
- OlaOld
- OldOld
- OleOle
- OleOli
- OliOLI
- OliOls
- Olsom
- OmOma
- OmaOme
- OmeOmn
- OmnOn
- ONOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOOc
- OodOpa
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOua
- OuaOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOVX
- OvyOwe
- OweOxi
- OxiOza
- OzaOzo
- OzoOZZ
- October London feat. Snoop Dogg
- October Man
- October Noir
- October People
- October Project
- October Rage
- October Rising
- October Sky
- October Tide
- October Tooth (Zachary Threlkeld)
- October, Jonny (NYC rapper)
- Octoberman (Canadian indie rock band)
- Octobre (rock band from Quebec)
- Octobre Rouge (French rap group)
- Ôctôctô
- OctoLab
- Octoploid
- Octoploid feat. Joutsen, Tomi
- Octoploid feat. Koivusaari, Tomi
- Octoploid feat. Kotamäki, Mikko
- 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
- Octopvs to the Party
- OCTPATH
- Octubre (spanish power-pop)
- Octubre Doce
- OCULA
- OCULA feat. LaRue, Phillip
- OCULA feat. Tailor
- Oculist, The
- Oculos (Death/Thrash Metal band from Turkey)
- Ocults
- Oczojebny, Jakub
- Oczojebny, Jakub feat. Kiti
- OD Band
- OD Bongo
- OD Kokemus
- OD404
- Oda (Norwegian pop singer)
- Oda (French stoner doom band)
- Oda Loves You
- Oda, Hiroyuki pres. HanasoumenP
- Oda, Kaori (KAORI for Yuki Kajiura)
- Oda, Kazumasa
- Oda, Tetsurou
- Oda, Yuji
- Oda, Yuji
- ODAE
- Odal, Billy
- Odani, Misako
- Odar (Bosnian Black Metal from Sarajevo)
- Odawas
- Odbicia, W Witrynach
- ODC (Modern Rock and Metal project created and led by Celia Do)
- ODC feat. SUN
- ODC, Offspec
- 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 Chap & Lea, Emma
- Odd Chap & Lyre Le Temps
- Odd Chap & Rose, Octavia
- Odd Chap, Myers, Sarah
- Odd Couple (house artist)
- Odd Couple (German garage rock band)
- Odd Couple, The (US hip-hop duo Louis Logic & Jay Love)
- Odd Couple, The feat. Celph Titled, J‐Zone & Brown, J.J.
- Odd Crew
- ODD EYE
- ODD EYE CIRCLE (South Korean girl group)
- ODD Foot Works
- Odd Future
- Odd Logic (US prog rock/metal)
- Odd Mob
- Odd Mob & OMNOM: HYPERBEAM
- Odd Mob feat. Alexander, Kameron
- Odd Mob feat. Blackman, Bertie
- Odd Mob feat. Graves, Ed
- Odd Mob ft. Blackman, Bertie
- Odd Mob ft. Lizzy Land
- Odd Mob x Super Silly
