- 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
- 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 Noize (Atlanta hip-hop production group)
- Organized Rhyme
- Organizing Committee, The
- Orgasmo (Bolivian Funk Rock Band)
- ORGAVSM
- Orgel Sound J‐pop
- Orgel, Matthew
- Orgg
- Orgi-E (Danish Rapper)
- Orgi-E feat. Jooks
- Orgi-E feat. Marwan
- Orgi-E feat. Winther, Bjarke
- Orgil
- Orgnners, The
- Orgonášová, Ľuba, Slovenského rozhlasu, Symfonický orchester, Humburg, Will
- 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, Mahmut & Şener, Sena
- Orhan, Mahmut feat. Şener, Sena
- Orhan, Sevcan
- Orhon, Cüneyd
- Orhon, Ozan
- 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
- Orientales, Les
- Oriente (Rap group)
- Oriente, Luz, Cynthia & Delacruz
- Orig. Alpenland Quintett
- ORIGA (Russian singer active in Japan)
- Origami Angel
- Origami Aquém
- Origami Button
- Origami Phase
- Origami Tsunami (Alternative band from Manchester)
- Origamibiro
- Origen
- Origene
- Origin (US, Kansas, metal band)
- Origin Unknown (UK drum & bass producers Andy C & Ant Miles)
- Origin, The
- Originais do Samba, Os
- Originais do Samba, Os & Xis
- Original 3
- Original 7ven, The (formerly 'The Time')
- Original Alpenland Quintett
