- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- oblObs
- ObsOce
- OceOch
- OchOCT
- OctODC
- ODCOdd
- OddOde
- OdeODU
- ODUof
- ofOFF
- OffOFK
- OfMOgr
- OgrOh
- OhOhi
- OhiOim
- OimOK
- OKOke
- OkeOl
- OlOl
- OlaOld
- OldOle
- OleOlg
- OlgOli
- OliOli
- OliOls
- OlsOma
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneOnk
- OnkOno
- OnoOny
- OnyOos
- OosOpe
- OpeOPL
- OPMOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriORK
- OrkOro
- OroOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOSK
- OskOss
- OssOta
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOza
- OzaOzo
- OzoOzz
- Orrje, Carl, Piano Ensemble
- Orsa spelmän
- Orselli, Folco
- Orsen
- Orsen, Jack
- Orsen, Jack & Taktloss
- Orsen, Jack & Taktloss
- Orsen, Jack & Taktloss feat. EundB & King Orgasmus One
- Orsenna, Erik
- Orsi
- Orslok
- Orslok & Rojuu
- Orso, L’ (Italian band)
- Orso, L’ con tropicalisti, I
- Orso, L’ con Tropicalisti, I
- Orson (00s US power pop band)
- Orson Family
- Orsons, Die
- Orsons, Die feat. CRO
- Orsons, Die feat. Maxim
- Orsons, Die feat. Mine
- Orsow, Andy
- ORTA
- Orta, Choco
- Orta, Manuel
- Orta, María (Puerto Rican Christian music singer)
- Ortaç, Serdar
- Ortaça, Pedro
- Ortaçgil, Bülent
- Ortaçgil, Bülent - Teoman
- Ortaçgil, Bülent & Kızılok, Fikret
- Ortaçgil, Bülent & Teoman
- Ortaçgil, Bülent, Teoman
- Ortak, Svaba (rapper from Austria)
- Ortega, Anthony (jazz saxophonist)
- Ortega, Anthony, Trio
- Ortega, Emanuel
- Ortega, Fernando
- Ortega, Ginesa
- Ortega, Jeannie
- 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
- Ortiz, Farid / Oviedo, Emilio
- Ortiz, Farid & Durán, Jader
- Ortiz, Farid & García, Anuar
- Ortiz, Farid & Meza, Ciro
- Ortiz, Farid & Osorio, Dagoberto “El Negrito”
- Ortiz, Farid & Oviedo, Emilio
- Ortiz, Gerardo (Regional Mexican singer)
- Ortiz, Gumbi
- Ortiz, Joell (rapper fka Jo‐ell Quikman)
- Ortiz, Joell feat. Bruja, La
- Ortiz, Joell feat. Fat Joe
- Ortiz, Joell feat. Immortal Technique
- Ortiz, Joell feat. Novel
- Ortiz, Joell feat. Ras Kass, Stimuli, Grafh & Gab Gotcha
- Ortiz, Kevin
