- O
- OO
- OO
- OO
- OOaf
- OAFOaK
- OakOBE
- ObeObn
- OBO
- Oce
- OceOCS
- OCTOct
- OctOdd
- OddODE
- ODEOdo
- OdoOf
- OfOff
- OffOff
- OfiOgr
- Ogroh
- OhOHN
- OHNOiz
- OizOka
- OKAOkl
- OklOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOls
- OlsOm
- OmOma
- OmaOMG
- OMGOmo
- OmoOna
- OnaOne
- OneONE
- ONEOne
- ONEOne
- OneOnl
- OnlOns
- OnsOom
- OomOpe
- OpeOpg
- OpgOpt
- OptOra
- OraOrb
- OrbOrc
- OrcOrc
- orcOre
- OreOrh
- OrhOri
- ORIOrk
- ORKOro
- OroOrq
- OrqOrs
- OrsOrt
- OrtOsb
- OsbOsc
- OscOsl
- OslOst
- Ote
- OteOTR
- OTROtt
- OttOug
- OugOus
- OusOut
- OutOut
- OutOut
- OutOve
- OveOve
- OVEOwe
- OweOwl
- Owl
- Oxx
- Ozz
- Ozzozz
- Orsen, Jack & Taktloss
- Orsen, Jack & Taktloss feat. EundB & King Orgasmus One
- 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
- 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. Blakk Soul
- Ortiz, Joell feat. Bruja, La
- Ortiz, Joell feat. Fat Joe
- 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
- 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
