- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOCT
- OctOda
- OdaODE
- ODEODU
- ODUOfe
- OfeOG
- OGOh
- OhOhl
- OhmOjo
- Ojookg
- okhOla
- OlaOld
- OldOle
- OleOli
- OliOlm
- OLMOma
- OmaOme
- OmeOmo
- OMPOnd
- OndOne
- Oneone
- oneONJ
- OnkOns
- Ons
- OosOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- OriOro
- OroOrq
- OrqOrv
- OrvOsb
- OsbOsk
- OskOst
- Oth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOva
- OvaOve
- OveOwe
- OweOxf
- Oxf
- OZZ
- Oberschlesien
- Oberst, Conor
- Oberst, Conor and Mystic Valley Band, The
- Obese Turtles, The (Kimya Dawson side project)
- Obeses
- Obey City
- Obey Me! Boys
- Obey the Brave
- Obey, Ebenezer
- OBGMs, The
- Obi (UK britpop band)
- Obi Best (formerly called Colorforms)
- Obia le Chef
- Obia le Chef avec Caballero & JeanJass
- Obia le Chef feat. Tizzo
- Obiat
- Obibox
- Obie Hans
- Obiedo, Ray
- Obieglo, Andreas
- Obispo, Pascal
- Obispo, Pascal & Alexia Gredy
- Obispo, Pascal & Angi, Giordana
- Obispo, Pascal & Frégé, Élodie
- Obispo, Pascal & Mars, Mélissa
- Obispo, Pascal & St-Pier, Natasha
- Obispo, Pascal avec Zazie
- Obispo, Pascal feat. Calogero
- Obispo, Pascal feat. Casal, Luz
- 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)
- obli
- Obligaatiot
- Obligatorisk Tortyr
- Obliging Victims, The
- 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 (US garage punk trio)
- Oblivion (Chicago punk band)
- Oblivion (Blackened Technical Death Metal from the Bay Area)
- Oblivion (US metal band from Bay Area, California)
- OBLIVION DUST
- Oblomov (Czech experimental black/death metal band)
- 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 (Bangladeshi band)
- Obscure Anachronism
- Obscure Disorder
- Obscure Sphinx
- Obscure, The
- Obscurity (Swedish death metal band)
- Obscurity (Black/Viking metal band from Germany)
