- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- 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 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)
- 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)
- OK Band (Serbian pop-folk band)
- OK Button (Group from Scotland)
- OK Cool (Chicago based indie duo)
- ok danke tschüss
- OK Factor, The (Cello and violin duo of Olivia Diercks and Karla Colahan)
- OK Go
- Ok Goodnight (progressive rock band based in Boston, MA)
- Ok Goodnight feat. Hull, Elizabeth
- OK K.O.! Let’s Be Heroes
- OK KID
- OK KID feat. Banjo, Olli
- OK KID feat. Gerard
- OK KID feat. Mädness
- OK KID feat. Megaloh
- OK KID feat. Spilker, Frank
- Ok Moon
- OK PANDA (Belgian electro pop/rock band)
- OK Pirámides
- OK Social Club, The
- OK Sweetheart
- Ok, Ju Hyun
- Ok, Taecyeon
