- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeOBL
- OblObs
- Obsoce
- OceOce
- oceOct
- OctOda
- OdbOdd
- OddOde
- OdeODU
- ODUOf
- OfOff
- OFFOfi
- Ofiogo
- OGROh
- OhOhi
- OhiOIL
- OilOk
- OkOke
- OkeOl
- OlOla
- OlaOld
- OldOl
- OlOlg
- OlgOli
- OliOli
- OliOls
- OlsOMA
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- ONEOne
- OneOne
- OneOne
- OneONJ
- OnkOnn
- ONOOny
- OnyOos
- OosOpe
- OpOpi
- OpiOpu
- OpuOra
- Oraorb
- OrbOrc
- OrcOrc
- OrcOre
- OreOrh
- OrhOri
- ORIOrk
- OrkOrn
- OrnOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOsk
- OskOss
- OssOT
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOve
- OveOwe
- OweOwl
- OwlOxl
- Oxl
- OzaOzo
- OzoOzz
- Obsidian Tide feat. LePond, Michael
- Obsidian Tide feat.LePond, Michael
- Obsidian Tongue (US atmospheric black metal)
- Obsidian Voice
- Obsidion (symphonic metal)
- Obsidiots
- Obsidious
- Obskür (Dublin duo)
- Obskür (Obskür)
- Obskuros
- Obsolescence
- Obsolete Humanity (Belgian death/groove metal band)
- Obsolete Mankind
- Obsolete Theory
- Obsoletos
- Obstetra (Grindcore from Spain)
- Obstler
- Obstrukt
- Obstruktor
- OBSYDIA (NIJISANJI EN VTuber group)
- Obtained Enslavement
- Obtenebris
- Obtest
- Obukuro, Nariaki
- Obús
- Obviously
- obylx
- Obywatel G.C.
- OBZ (Dutch Group)
- Obzee, Barry
- OC (German Rapper)
- OC Chris (Dallas rapper)
- OC Hermo
- OC Saint
- OC Ska Kids
- OC Times (Barbershop Quartet)
- OC Tolbert
- OC, Charlotte (Singer)
- Ocak, Arif Erdem
- Ocaklı, Erkan
- Öçal, Burhan & Trakya All Stars, The
- Ocampo, Pablo
- Ocaña, Chico
- Ocasan
- Ocasek, Ric
- Ocaso (Hardcore deathcore band from Chile)
- OCB (alias of Moroccan DJ & producer Driss Bennis)
- Occams Laser
- Occas (new age)
- Occasional Dreams
- Occasionally Humans
- Occasionally, Jordan
- Occhipinti, Michael & Shine On
- Occrasy (Alternative rock from Sweden)
- Occult (Dutch thrash metal band)
- Occult (Dutch Death/Thrash Metal band)
- Occult Hand Order
- Occult X
- Occultation (US Doom Metal)
- Occults
- Occultum (Black Metal from Poland)
- Occultus (Occultus Melodic Black Metal band from Cali Colombia)
- Occurrence (Experimental Electronic Pop Band from NYC)
- OCD (Philadelphia rap duo)
- Oceaán (Brussels-born Manchurian electronic music producer)
- Oceán (Czech electronic group)
- Ocean (1970s Canadian gospel/soft rock band)
- Ocean (Swiss soft rock/folk rock band)
- Ocean (Polish rock band)
- Ocean (1960s US folk rock band)
- Ocean Alley
- Ocean Beats & Shiloh Dynasty
- Ocean Between Us, An
- Ocean Between Us, The
- Ocean Blue, The (American indie pop)
- Ocean Chief
- Ocean Colour Scene
- Ocean Drive
- Ocean Drive feat. Oriska, DJ
- Ocean Flaws
- Ocean Floor (Northern UK alt-rock 4 piece)
- Ocean Flor
- Ocean Grove (Australian nu metal band)
- Ocean Grove (United States)
- Ocean Grove feat. Adult Art Club & New Babylon
- Ocean Grove feat. Dune Rats
- Ocean Grove feat. lil aaron
- Ocean Hills (Rock band from Los Angeles)
- Ocean Is Theory
- ocean jams
