- 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
- Orsen, Jack & Taktloss
- Orsenna, Erik
- Orsi
- Orso, L’ (Italian band)
- Orso, L’ con tropicalisti, I
- Orso, L’ con Tropicalisti, I
- Orsolics, Hans
- Orson (00s US power pop band)
- Orson Family
- Orsons, Die
- Orsons, Die feat. CRO
- Orsons, Die feat. Maxim
- Orsons, Die feat. Mine
- ORTA
- Orta, Choco
- Orta, Manuel
- Orta, María (Puerto Rican Christian music singer)
- Orta, Paul
- Ortaç, Serdar
- Ortaçgil, Bülent
- Ortaçgil, Bülent & Kızılok, Fikret
- Ortaçgil, Bülent & Teoman
- Ortak, Svaba (rapper from Austria)
- Ortega, Anthony (jazz saxophonist)
- Ortega, Anthony, Trio
- Ortega, Emanuel
- Ortega, Fernando
- Ortega, Ginesa
- Ortega, Jeannie
- Ortega, Jeannie feat. Papoose
- Ortega, José (designer)
- Ortega, Lindi
- Ortega, Luis "Luca" (Luis Carlos Ortega; Mexican musician, producer, composer/songwriter)
- Ortega, Michael
- Ortega, Miguel (Spanish conductor)
- Ortega, Paco
- Ortega, Palito (singer, actor, record producer, film director, politician)
- Ortega, Rosario (Argentinean singer)
- Ortegon, Sr (José Miguel Ortegón)
- Ortelli, Paolo
- Ortelli, Paolo, Matrix, DJ, Party Boomers feat. C, Jay
- ortensia
- Örter, Hasan Cihat
- Ortero, David
- orteus
- Orth, Marisa
- Orthentix
- Orthodox (Spanish doom metal)
- Orthodox (straight edge hardcore band from Nashville, TN, US)
- Orthodox Celts
- Orthostat
- orti (electronic/electroclash/techno project)
- Orties
- Ortiga (Chilean canto nuevo group)
- Ortiga (Former Esteban & Manuel member)
- Ortiga & Grande Amore
- Ortiz Tirado, Alfonso
- Ortiz, Alfredo Rolando (player of the Paraguayan harp)
- Ortiz, Anthony
- Ortiz, Bill
- Ortiz, Carola
- Ortiz, Coqui
- Ortiz, Cristina (Brazilian pianist)
- Ortiz, Esaú
- Ortiz, Farid & Durán, Jader
- Ortiz, Farid & García, Anuar
- Ortiz, Farid & Osorio, Dagoberto “El Negrito”
- Ortiz, Gerardo (Regional Mexican singer)
- Ortiz, Joell (rapper fka Jo‐ell Quikman)
- Ortiz, Joell feat. Blakk Soul
- Ortiz, Joell feat. Bruja, La
- Ortiz, Joell feat. Immortal Technique
- Ortiz, Joell feat. Novel
- Ortiz, Kevin
- Ortiz, Mario (violinist)
- Ortiz, Mario (salsa artist and arranger)
- Ortiz, Paul y La Orquesta Son
- Ortize, Brian
- Ortolani, Riz
- Ortolani, Riz feat. Ranieri, Katyna
- Orton, Beth
- Orton, Mark
- Ortopedia Técnica (Garage Punk band from Castellón de la Plana)
- ortoPilot
- Ortsul (Poland / Black Metal)
- ORU Worship
- Oruã (Brazilian group)
- Oruam (Brazilian rapper)
- Oruç, Mustafa
- Orup (Swedish musician Hans Thomas Eriksson)
