- O
- OO
- OO
- OOak
- OakObe
- ObeObr
- OBSOce
- OceOch
- OchOct
- OctOde
- OdeOdo
- OdoOf
- OfOff
- OffOgr
- OgrOha
- Oiz
- OizOka
- OKAOkw
- OkYOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOm
- OmOmi
- OMIOn
- OnOne
- OneOne
- OneONE
- oneOnl
- OnlOnu
- OnuOoy
- OozOpe
- OpgOpu
- OpuOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- OriOrn
- OrnOrq
- OrqOrt
- OrtOsb
- OsbOsh
- OshOss
- OssOte
- OteOtt
- Ott
- Out
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOXO
- OxoOzo
- OzoOZZ
- Ōhara, Sakurako
- Ohara, Yuiko
- Ohashi, Ayaka
- Ohashi, Chippoke
- Ohashi, Junko
- ohashiTrio
- Ohasis (Oasis Tribute band from Nottingham)
- Ohbijou
- Ohead
- OHEY
- OhGeesy
- OhGeesy feat. BIA
- OhGeesy Feat. Boogie Wit da Hoodie, A
- OhGeesy feat. Cash Kidd
- OhGeesy Feat. Central Cee
- OhGeesy Feat. DaBaby
- OhGeesy feat. Kalan.FrFr
- OhGeesy feat. Tyga
- ohGr (electro-industrial band)
- Ohguro, Maki
- Ohio Express
- Ohio Players
- Ohio State University Marching Band
- Ohja, Udhav, Shetty, Manohar, Ishaan, Pandit, Shweta, Bhatawdekar, Sonali & Mazumdar, Preetha
- OHKABE (Canadian Artist)
- Ohkawa, Mizuki (riparia records)
- Ohlenbusch, Henning (singer/songwriter)
- Ohlin, Ari
- Ohm (fusion band of ex-Megadeth guitarist Chris Poland)
- Ohm Guru
- Ohm-I (Leron Gray)
- Ohm-N-I
- Ohmama, Takashi
- Ohmna
- Ohmura, Takayoshi
- OHN
- OHNA (Newcastle, Australia)
- Ohno, Aika
- Ohno, Eri
- Ohno, Yuji (anime music composer and jazz pianist)
- Ohno, Yuji & Lupintic Five
- Ohno, Yuji, Trio
- OHO (Trip-Hop/Folk/Electronica)
- OhPonyBoy
- OHR (Seattle based psych solo project of Craig Klein.)
- Ohrage
- Ohrbooten
- Ohrenfeindt
- Ohta, Mitsuhiro
- Ohtaki, Eiichi
- Ohtani, Tomoya, Eguchi, Takahito feat. Barnitt, Quinn
- Ohtis
- Ohuchi, Yoshiaki
- OHYUNG
- Oi Polloi
- Oi Va Voi (British band)
- Oi Va Voi feat. Zinger, Earl
- Oi-Melz
- Oi-Skall Mates
- Oi! Scouts, The (Oi band from USA)
- Oi! Se Arma (Islas Canarias)
- Oi! The Arrase
- Óige
- Õigemeel, Birgit
- OIJ (Dutch musician Valentijn Crouwel)
- Oikawa, Mitsuhiro
- Oiki (dubstep artist)
- Oil (Bolivian Rock Band)
- Oil 10
- Oil Barons, The
- Oil Boom
- Oil Giant
- Oil on Canvas (Daggers, Hoffmann)
- Oiling Boiling Rhythm ’n’ Blues Band
- Oilix
- Oimara
- Oimara (aka Benedikt Hafner)
- Oingo Boingo
- OIO (polish Hip-Hop trio (OKI, Igi, Otsohodzi))
- OiOai (Portuguese pop-rock band)
- OIR A RIO
- Oirabot
- Oishi, Masayoshi
- Oisín (70/80s Irish Celtic Folk)
- Oisin (Argentinian nu metal band)
- Oistrakh, David Fiodorovich (violinist)
- Oistrakh, David Fiodorovich, Yampolsky, Vladimir
- Oizo, Mr. (Quentin Dupieux)
- Oizo, Mr. & Phra
- Oizo, Mr. feat. Boys Noize
