- 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
- Oishi, Masayoshi
- Oisín (70/80s Irish Celtic Folk)
- Oisin (Argentinian nu metal band)
- Oistrakh, David Fiodorovich (violinist)
- Oistrakh, David Fiodorovich, Yampolsky, Vladimir
- Oitava Igreja Presbiteriana de Belo Horizonte
- 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
- 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)
- Ojos (groupe)
- Ojos de Brujo
- Ojos de Brujo feat. Bebe
- Ojos de Brujo feat. Capossela, Vinicio
- Ojos de Brujo feat. Chicuelo
- 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 Band (Czech new wave band)
- OK Button (Group from Scotland)
- OK Cool (Chicago based indie duo)
- ok danke tschüss
- 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. 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
- OKAAY
- Okabayashi, Kazuma (Japanese ambient / drone musician)
- Okabe (Canadian Artist)
- Okabe, Keiichi
- Okada, Yukiko
- Okafor, Ben
- Okaly, Kyle
