- O
- OO
- OO
- OO
- OOak
- OakOb
- ObObl
- OblOC
- OCOce
- OCEOct
- OctOcu
- OcuOdd
- OddOdi
- OdiODZ
- OeOff
- OffOff
- Offogo
- ogoOh
- OhOHN
- OhnOje
- OjeOKA
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- Ols
- OmaOme
- OmeOmn
- OmnOna
- OnaOne
- OneONE
- Oneone
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpp
- OprORA
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrq
- OrqOrs
- OrsOru
- Osb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtt
- OttOty
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxa
- OxbOZ
- Oz
- ozz
- Oblivion (French Heavy Metal with two formers members from Nightmare)
- Oblivion (New Jersey thrash metal band)
- Oblivion (US metal band from Bay Area, California)
- OBLIVION DUST
- Oblivion Machine
- Oblivion’s Mighty Trash
- Oblon, Jim (LA/Nashville guitarist, drummer)
- OBLVYN
- OBLVYN & RIELL
- OBLVYN & Røyale
- OBN Dev
- ObnoXiouS (Dutch metal band)
- Obnoxiuz (Swedish rapper)
- OBO (German flamenco guitarist)
- Obo & Jorge
- Obojeni program
- Obongjayar
- 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)
- Obscenity (German death metal band)
- Obscenity Trial
- Obscura (technical death metal band from Munich, Germany)
- 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 Obsesion 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)
- Obstrukt
- Obstruktor
- OBSYDIA (NIJISANJI EN VTuber group)
- Obtained Enslavement
- Obtest
- Obukuro, Nariaki
- Obús
- Obviously
- obylx
- Obywatel G.C.
- OBZ (Dutch Group)
- OC Chris
