- 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
- Order of the Fly, The
- Order of Týr
- Order of Voices
- Order, The (Hard 'n' Heavy, Switzerland)
- Order89 (Parisian darkwave trio)
- Ordge, Jimmy Arthur (Canada)
- Ordher, The
- Ordinaires, The (USA band)
- Ordinance (USA progressive death metal)
- Ordinarius
- Ordinary Boys, The
- Ordinary Elephant
- Ordinary People (New Jersey)
- Ordinary Peoples
- Ordinary Surfers
- Ordinary Time
- Ordinul Negru
- Ordo Equilibrio
- Ordo Equitum Solis
- Ordo Rosarius Equilibrio
- Ordo Rosarius Equilibrio feat. Spiritual Front
- Ordog (doom metal band from Finland)
- Ordonówna, Hanka
- Ordorika, Ruper
- Ordos (Swedish stoner/metal)
- Ordre du Chaos, L' (Projet musical franco-allemand mêlant folk-rock médiéval et metal moderne lent et syncopé.)
- Oré (French hip-hop/chanson/neo soul rapper/vocalist)
- Oreada
- Orealis
- Oreazon
- Orebolo (Norwalk, CT indie band)
- Orecus (Melodic Death Metal/Groove Metal from Sweden)
- oreglo (Jazz fusion, jazz-funk, london jazz, reggae, London)
- Oregon
- Oregon Bike Trails
- Oreia (Brazilian rapper)
- Oreia, Hot e (Brazilian Rap Duo)
- Oreiro, Natalia
- Oreja (UK producer/DJ Paul Dolby aka Seiji)
- Oreja de Van Gogh, La
- Orelha, MC
- Orellana Lucca
- Orellana, Raúl (DJ & producer)
- Orellana, Raúl feat. Brown, Jocelyn
- Orellana, Roberto
- Orelle (Italian artist Elisabetta Pasquale)
- Orelsan (French rapper)
- Orelsan & Gringe
- Orelsan & Toxic Avenger, The
- Orelsan feat. Cordae
- Orelsan feat. Damso
- Orelsan feat. FIFTY FIFTY
- Orelsan feat. GIMS
- Orelsan feat. GIMS
- Orelsan feat. Gringe
- Orelsan feat. Ibeyi
- Orelsan feat. Ikuta, Lilas
- Orelsan feat. Nekfeu & Rascal, Dizzee
- Orelsan feat. Neptunes, The
- Orelsan feat. Stromae
- Orelsan feat. Thal, Ron “Bumblefoot”
- Orelsan feat. Yamê
- Orelsan with Bangalter, Thomas
- Oremuz
- Oren, Foreign
- Oren, Peter
- Orenstein, Janet
- Orenstein, Norman
- ORESAMA
- ORESKABAND
- Oreste & His Queensland Orchestra
- Orestea (UK band)
- Oresteia
- Orestes (Indonesian metal band)
- Oreya
- Orfeo (Eddy de Clercq, Otto van den Toorn)
- Orfeó Català
- Orff, Carl (composer)
- Orff, Carl; Berliner Philharmoniker, Shinyukai Choir, Ozawa, Seiji
- Orfield, Carson
- Orford, Martin
- Organ (Finnish synth pop group)
- Organ Beats, The
- Organ Donor (Richmond, VA Death Metal Band)
- Organ Donor (early 2000s rock band)
- Organ Donors (hard dance group)
- Organ Freeman (US)
- Organ Tapes
- Organ, Samuel
- Organ, Samuel feat. Dazey
