- 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
- Ohno, Aika
- Ohno, Eri
- Ohno, Katsuo
- Ohno, Yuji (anime music composer and jazz pianist)
- Ohno, Yuji & Lupintic Five
- Ohno, Yuji, Trio
- OHO (Trip-Hop/Folk/Electronica)
- OHora, Zephaniah
- OhPonyBoy
- OHR (Seattle based psych solo project of Craig Klein.)
- Ohrage
- Ohrbooten
- Ohrenfeindt
- Ohta, Mitsuhiro
- Ohtaki, Eiichi
- Ohtani, Tomoya, Eguchi, Takahito feat. Barnitt, Quinn
- Ohtar (Polish black metal)
- Ohtis
- Ohuchi, Yoshiaki
- OHYUNG
- OHYUNG & STEFA*
- 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
- Oídos Fresh, Los
- Oigăn (Eugen Nuțescu)
- Óige
- Õigemeel, Birgit
- Oihenart, Maddi (Basque singer)
- OIJ (Dutch musician Valentijn Crouwel)
- Oikawa, Mitsuhiro
- Oiki (dubstep artist)
- Oil (Bolivian Rock Band)
- Oil (Hard Rock band from Lahr in Germany)
- Oil 10
- Oil Barons, The
- Oil Boom
- Oil Giant
- Oil on Canvas (Daggers, Hoffmann)
- Oil Thief
- 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
- Oiseaux-Tempête
- Oishi, Masayoshi
- Oisín (70/80s Irish Celtic Folk)
- Oisin (Argentinian nu metal band)
- Oister Boy (Minneapolis grunge punk band)
- Oistrakh, David Fiodorovich (violinist)
- Oistrakh, David Fiodorovich, Berliner Philharmoniker
- Oistrakh, David Fiodorovich, Moscow Philharmonic Orchestra, Rozhdestvensky, Gennadi Nikolayevich
- Oistrakh, David Fiodorovich, State Academic Symphony Orchestra of the Russian Federation, Kondrashin, Kirill
- Oistrakh, David Fiodorovich, Yampolski, Vladimir
- Oistrakh, David Fiodorovich, Yampolsky, Vladimir
- Oito7Nove4
- Oizo, Mr. (Quentin Dupieux)
- Oizo, Mr. & Phra
- Oizo, Mr. feat. Bart B More
- Oizo, Mr. feat. Boys Noize
- Oizo, Mr. feat. Castro, Carmen
- Oizo, Mr. feat. Charli xcx
- Oizo, Mr. feat. Mocky
- Oizo, Mr. feat. Peaches
- Oizo, Mr. feat. Phra
- Oizo, Mr. feat. Siriusmo
- Oizo, Mr. feat. Skrillex
- Oizo, Mr. feat. Uffie
- Oizo, Mr., Phra & Frah Quintale
- OJ da Juiceman
- OJ da Juiceman & Gorilla Zoe
- OJ da Juiceman & Gucci Mane
- Ojaghloo, Mobin
- Ojala, Aleksi
- Ojanen, Ville
- Ojatula, Celeste
- Ojay (Alternative Rock)
- Ojba Rasta
- Ojeda Fabián (Paraguayan Christian music singer)
- Ojeda, Eddie
