- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOCE
- OceOct
- octOdd
- OddOdi
- OdiOf
- OfOff
- OffOh
- ohohG
- OhgOji
- OJMokh
- OKIOla
- OlOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnOnb
- OncOne
- OneOne
- OneOni
- ONJont
- OntOos
- OotOph
- OphOR
- OrOrb
- OrbOrc
- OrcORE
- OreOri
- OriOrl
- OrlOrp
- OrpOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOye
- Ozy
- OzzOZZ
- Obispo, Pascal & Mars, Mélissa
- Obispo, Pascal & St-Pier, Natasha
- Obispo, Pascal avec Zazie
- Obispo, Pascal feat. Baby Bash
- Obispo, Pascal feat. Calogero
- Obispo, Pascal feat. Casal, Luz
- Obispo, Pascal feat. Christophe
- Obispo, Pascal feat. Hallyday, Johnny
- Obispo, Pascal feat. La Troupe des Dix Commandements
- Obispo, Pascal feat. N'Dour, Youssou
- Obispo, Pascal feat. N’Dour, Youssou
- Obispo, Pascal feat. Pagny, Florent
- Obispo, Pascal feat. Stoner, Sam
- Obispo, Pascal feat. Zazie
- Obispo, Pascal, Willem, Christophe, Fiori, Patrick, Alizée
- Obito
- Obits
- Obituary (US death metal band)
- Objekt (TJ Hertz)
- Objektif
- Objetivo Birmania
- OBK
- OBLADAET (Russian rapper)
- Obladaun (Russian parody rap)
- Obligaatiot
- Obligatorisk Tortyr
- Oblio (Alt-rock trio based in Pasadena California)
- Oblique (New Wave/Electronic)
- Oblique (Bangladeshi band)
- Oblique Brown
- Obliterate (Slovak grindcore)
- Obliterate (Canadian deathcore)
- Obliterations
- Oblivia (Australian band)
- Oblivians
- Oblivion (Chicago punk band)
- Oblivion (Blackened Technical Death Metal from the Bay Area)
- Oblivion (US metal band from Bay Area, California)
- OBLIVION DUST
- Oblivion Machine
- OBLVYN
- OBN Dev
- ObnoXiouS (Dutch metal band)
- Obo & Jorge
- Obojeni program
- Obongjayar
- Obongjayar feat. Garcia, Nubya
- OBOY (French rapper, Mihaja Ramiarinarivo)
- Obradors, Fernando
- Obregon, Juan (from Venezuela, Obregon Music, Obregon hand move)
- Obrero
- Obrint Pas
- OBS (German DJ duo)
- 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 (Pioneer in Bangladesh)
- Obscure Anachronism
- Obscure Disorder
- Obscure Sphinx
- Obscure, The
- Obscurest Vinyl (AI generated music, uses various false pseudonyms)
- 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
- Obsessed, The (doom metal music)
- Obsession (UK dance remakes for Almighty Records)
- Obsession (American metal)
- Obsessive
- Obsessives, The
- Obsidia (Dubstep/Dubstyle/Drum & Bass/Electronic Producer from the UK)
- Obsidia & Boyinaband
- Obsidian Kingdom
- Obsidian Mind
- Obsidian Shell
- Obsidian Shrine
- Obsidian Tide
- Obsidian Tongue (US atmospheric black metal)
- Obsidiots
- Obsidious
- Obskür
- Obskür (Obskür)