- O
- OO
- OO
- OO
- OOaf
- OAFOaK
- OakObe
- ObeOBO
- Obo
- OcaOce
- OceOCT
- OctOct
- OctOdd
- oddODE
- ODEOdo
- OdoOf
- OfOFF
- OffOfi
- OfiOgr
- OgrOh
- OhOhn
- OhnOJ
- OJOka
- OKAOko
- OkoOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOls
- OlsOma
- OmaOmb
- OMBOMI
- OMIOmo
- OmoOnc
- OncOne
- OneONE
- OneONE
- OneONF
- OnFOnl
- OnlOnu
- OnuOom
- OomOpe
- OpeOph
- OphOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrc
- OrdOre
- OreOri
- OriOri
- OriOrl
- Orl
- OroOrq
- OrqOrs
- ORTOrw
- OrwOsb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtr
- OTROtt
- OttOum
- OumOut
- OUTOut
- OutOut
- OutOuv
- OUWOVE
- OveOvi
- OviOwe
- OweOwu
- OwuOya
- OyaOzi
- oziozz
- Obo & Jorge
- Obojeni program
- Obongjayar
- Obongjayar & Sarz
- Obongjayar feat. Garcia, Nubya
- Obongjayar feat. Little Simz
- OBOY (French rapper, Mihaja Ramiarinarivo)
- OBOY feat. SCH
- Obradors, Fernando
- Obray Ramsey (folk musician and banjo player)
- obraza net (Russian electro-punk band)
- Obregon, Juan (from Venezuela, Obregon Music, Obregon hand move)
- Obrero
- Obrint Pas
- OBS (German DJ duo)
- Obscene Eulogy (Canadian black metal)
- Obscene Illusion (Swedish death metal band)
- Obscene Worship
- Obscenity (German death metal band)
- Obscenity Trial
- Obscura (technical death metal band from Munich, Germany)
- Obscura Hail
- Obscura Qalma (Symphonic death metal from Venice, Italy)
- Obscura Religio
- Obscurcis Romancia
- Obscure (Bangladeshi band)
- Obscure Anachronism
- Obscure Disorder
- Obscure of Acacia
- Obscure Sphinx
- Obscure, The
- Obscurest Vinyl (parody music)
- Obscurity (Swedish death metal band)
- Obscurity (black/Viking metal band from Germany)
- Obsequiae
- Observatory, The (US rock band from Athens, Georgia)
- Observatory, The (Singaporian space rock)
- Observe & Control
- Observer (Shoegaze)
- Observer Drift
- Obsesion, La (La Obsesión Factory)
- Obsessed, The (doom metal music)
- Obsession (UK dance remakes for Almighty Records)
- Obsession (New Haven, CT metal)
- Obsessive (1990s techno/trance artist David Lübner)
- Obsessives, The
- Obsidia (Dubstep/Dubstyle/Drum & Bass/Electronic Producer from the UK)
- Obsidian Kingdom
- Obsidian Mantra (Polish Prog Death Metal)
- Obsidian Mind
- Obsidian Shell
- Obsidian Shrine
- Obsidian Tide
- Obsidian Tide feat. LePond, Michael
- Obsidian Tide feat.LePond, Michael
- Obsidian Tongue (US atmospheric black metal)
- Obsidian Voice
- Obsidiots
- Obsidious
- Obskür (Dublin duo)
- Obskür (Obskür)
- Obskuros
- Obsolescence
- Obsolete Humanity (Belgian death/groove metal band)
- Obsolete Theory
- Obsoletos
- Obstetra (Grindcore from Spain)
- Obstler
- Obstrukt
- Obstruktor
- OBSYDIA (NIJISANJI EN VTuber group)
- Obtained Enslavement
- Obtest
- Obukuro, Nariaki
- Obús
- Obviously
- obylx
- Obywatel G.C.
- OBZ (Dutch Group)
- OC (German Rapper)
- OC Chris
- OC Hermo
- OC Saint
- OC Ska Kids
- OC Times (Barbershop Quartet)
- OC, Charlotte (Singer)
- Ocak, Arif Erdem
- Ocaklı, Erkan
- Öçal, Burhan
- Öçal, Burhan & Trakya All Stars, The
