- 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
- 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
- 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)
- 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 (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)
- Ojeda, Tino
- Ojerime (R&B singer)
- Ojete Calor
- Ojima, Yoshio (composer and music producer)
- Ojinaga, La Fiera De
- OJM (Italian stoner rock band)
- Ojo Rojo (German stoner rock)
- Ojo, Daniel (Gospel Singer)
- Ojos (French duo)
