- O
- OO
- OO
- OO
- OOak
- OakObe
- ObeObr
- ObrOcc
- OccOce
- OceOct
- OctODD
- ODDODE
- ODEOdr
- OdrOfb
- OfdOff
- OffOgf
- OghOh
- OhOHN
- OHNOje
- OjeOka
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OllOls
- OlsOm
- OmOme
- OmeOMO
- OmoOnc
- OncOne
- OneOne
- OneOne
- OneONL
- ONLOnr
- OnrOol
- OolOpe
- OpeOpi
- OpiOqu
- OquOra
- OraOrb
- Orborc
- orcORE
- OREOri
- OriOri
- OriORM
- OrmOrp
- OrpOrs
- OrsOrv
- OrvOsb
- OsbOse
- OseOsm
- OsmOsu
- OsvOth
- OthOtt
- OttOua
- OuaOur
- OurOut
- OutOut
- OutOva
- OVAove
- oveOVX
- OvyOwl
- OwlOxm
- Oxm
- ozz
- ORESKABAND
- Oreste & His Queensland Orchestra
- Orestea (UK band)
- Oresteia
- Oreya
- Orfeó Català
- Orfeón Donostiarra (Spanish choir)
- Orff, Carl (composer)
- Orford, Martin
- Org Lounge
- 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, Samuel
- Organ, The
- Organ, Tyne-James
- Organ, Tyne-James & Gordi
- Organ, Willy (Belgian weirdo synthpop artist Simon Platteau)
- Organectomy (New Zealand brutal death metal)
- Organek, Tomek
- Organic Audio
- Organica
- Organised Scum
- Organismen (Swedish rapper)
- Organismen & Large, DJ
- Organismen & Large, DJ
- Organiz' (French R'n'B duo)
- Organización X
- Organización, La
- Organization, The (90s US funk metal band)
- Organized Family (Zambian music duo)
- Organized Konfusion (US alternative hip hop duo from Queens, NYC)
- Organized Konfusion feat. Hurricane G
- Organized Konfusion feat. Rude One, DJ
- Organized Noize (Atlanta hip-hop production group)
- Organized Rhyme
- Organizing Committee, The
- Orgasmo (Bolivian Funk Rock Band)
- ORGAVSM
- Orgel Sound J‐pop
- Orgi-E (Danish Rapper)
- Orgi-E feat. Bai-D & Wafande
- Orgi-E feat. Marwan
- Orgi-E feat. Winther, Bjarke
- Orgil
- Orgnners, The
- Orgone (US funk band)
- Orgone feat. de León, Adryon
- Orgone feat. Franklin, Fanny
- Orgonite (Rave band based in israel)
- Orgullo Nativo
- Orgy (US rock band)
- Orhan, Mahmut
- Orhan, Sevcan
- Orhon, Cüneyd
- Orhon, Özdal (Turkish Art Music performer)
- Ori (folktronica singer songwriter Ori Alboher)
- Ori, Viktor
- Oria (Progressive Groove Metal, Thessaloniki, Central Macedonia)
- Oriach, Riccie (Tropical artist from the dominican republic)
- Oriain, Charlie
- Oriakhi, Davina
- Orialus
- Oriana (Argentine model, actress and singer)
- Oriana Nash (American singer-songwriter, Oriana Isabel Nash)
- Orianthi
- Orianthi & Bonamassa, Joe
- Óriás
- Oribasi, Lisa (Swiss singer‐songwriter)
- Oribu
- Orician (Trance and progressive house producer)
- ORIE.
- Oriel, Jonathan
- Orielles, The
- Orient Expressions
- Orient Expressions feat. Aynur
- Orient Fall (modern progmetal band)
- Orient Pearl
- Oriental Sunshine
- Oriente (Rap group)
- Orig. Alpenland Quintett
- ORIGA (Russian singer active in Japan)
- Origami Angel
- Origami Button
- Origami Phase
- Origami Tsunami (Alternative band from Manchester)
- Origamibiro
