- O
- OO
- OO
- OOak
- OakObi
- ObiObt
- ObtOce
- OceOct
- OctOdd
- OddODM
- ODOOf
- OfOfn
- OfnOh
- OhOhm
- OhmOK
- OKOkm
- OKOOla
- OlaOld
- OldOli
- OliOll
- OllOly
- OlyOME
- OmeOMP
- OmpOnD
- OneONE
- ONEOne
- OneOnl
- OnlOOJ
- OojOpe
- OpeOpp
- OppOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- OriOrp
- OrpOrs
- OrtOsa
- OsaOse
- OshOss
- OssOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOxy
- OyOzu
- OzuOZZ
- Ohmna
- Ohmura, Takayoshi
- OHN
- Ohno, Aika
- Ohno, Eri
- Ohno, Yuji (anime music composer and jazz pianist)
- Ohno, Yuji & Lupintic Five
- Ohno, Yuji & You & The Explosion Band
- Ohno, Yuji, Trio
- OHO (Trip-Hop/Folk/Electronica)
- OhPonyBoy
- Ohrbooten
- Ohrenfeindt
- Ohtaki, Eiichi
- Ohtani, Tomoya
- Ohtani, Tomoya feat. NateWantsToBattle
- Ohtani, Tomoya, Eguchi, Takahito feat. Barnitt, Quinn
- Ohtis
- 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
- Oiki (dubstep artist)
- Oil (Bolivian Rock Band)
- Oil 10
- Oil Boom
- Oiling Boiling Rhythm ’n’ Blues Band
- Oilix
- 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
- Oizo, Mr. feat. Charli XCX
- Oizo, Mr. feat. Manson, Marilyn
- 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
- OJ da Juiceman feat. Gucci Mane
- Ojaghloo, Mobin
- Ojala, Aleksi
- Ojanen, Ville
- Ojatula, Celeste
- Ojba Rasta
- Ojeda Fabián (Paraguayan Christian music singer)
- Ojeda, Eddie
- Ojeda, Javier
- Ojeda, Jesús y sus Parientes (Regional Mexican)
- Ojerime (R&B singer)
- Ojete Calor
- Ojima, Yoshio (composer and music producer)
- OJM (Italian stoner rock band)
- Ojo Rojo (German stoner rock)
- Ojo, Daniel (Gospel Singer)
- Ojos (French duo)
- Ojos de Brujo
- Ojos de Brujo feat. Bebe
- Ojos de Brujo feat. Capossela, Vinicio
- Ojos de Brujo feat. Drexler, Jorge
- Ojos de Brujo feat. González Rivero, Roldán
- Ojos de Brujo feat. Juno Reactor
- Ojos de Brujo feat. Sawhney, Nitin
- Ojos de Brujo feat. Troba Kung-Fú, La
- Ojos Locos
- OK (french indie band)
- OK Band (Czech new wave band)