- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObs
- OBSOce
- OceOch
- OchOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OgaOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- OkaOku
- OkuOla
- OlaOld
- Oldold
- OldOle
- OleOli
- OliOli
- OLIOls
- OlsOM
- omOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOob
- OOcOP
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOu
- OuaOUR
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOvt
- OvvOwe
- OweOxh
- OxiOza
- OzaOzo
- OzoOZZ
- Orta, María (Puerto Rican Christian music singer)
- Orta, Paul
- 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, 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 / Oviedo, Emilio
- Ortiz, Farid & Durán, Jader
- Ortiz, Farid & García, Anuar
- Ortiz, Farid & Osorio, Dagoberto “El Negrito”
- 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
- Ortiz, Luis “Perico”
- Ortiz, Mario (violinist)
- Ortiz, Mario (salsa artist and arranger)
- Ortiz, Paul y La Orquesta Son
- Ortiz, Rich
- Ortize, Brian
- Ortolan (US indie pop band on Sounds Familyre)
- Ortolani, Riz (songwriter, film music composer and music director)
- Ortolani, Riz feat. Ranieri, Katyna
- Orton, Beth
- Orton, Beth feat. Callier, Terry
- Orton, Mark
- Ortopedia Técnica (Garage Punk band from Castellón de la Plana)
- ortoPilot
- Ortsul (Poland / Black Metal)
- Oruã (Brazilian group)
- Oruam (Brazilian rapper)
- Oruç, Mustafa
- Orup (Swedish musician Hans Thomas Eriksson)
- Orus, Susan (Swiss singer)
- Örvarsson, Atli (Icelandic score composer)
- Orvis, Jayke (US singer-songwriter)
- Orvokki
- Orwell (French band)
- Orwells, The
- Orxata Sound System
