- 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
- Örvarsson, Atli (Icelandic score composer)
- Orville Peck & Cuarón, Bu
- Orville Peck & Cyrus, Noah
- Orville Peck & Dawson, Debbii
- Orville Peck & John, Elton
- Orville Peck & Midland
- Orville Peck & Nelson, Willie
- Orville Peck & Rateliff, Nathaniel
- Orvokki
- Orwell (French band)
- Orwells, The
- Orxata Sound System
- Ory, Kid
- Oryad (doom metal/symphonic metal group)
- Oryema, Geoffrey
- oryl
- Oryon (Dutch producer Peter Smit)
- Orzabal, Roland (UK musician, songwriter and producer)
- OS (German duo)
- OS 101
- Os 3 do Nordeste
- Os Atuais
- Os Bardos
- Os Carbonos (vocal group)
- Os Cretinos
- Os Dentes
- Os Druidas
- Os Extintos
- Os Farrapos
- Os Garotin
- Os Golpes
- Os Kmaradas
- Os Mateadores
- Os Mulheres Negras
- Os Mundi
- Os Nativos (South-Brazilian gaucho music group)
- Os Pontos Negros
- Os Quebradeiras
- Os Serranos
- Os The Darma Lóvers
- Os Tincoãs
- Os Trapalhões
- Os Vips
- Os Vips (Os Vips)
- OS101 (hardcore punk band)
- Osa (El Caco frontman Øyvind Osa's solo project)
- OSA (Nigerian R&B singer-songwriter)
- Osa, Liv Bernhoft (Norwegian actress)
- Osada Vida
- Osadebe, Stephen Osita, Chief
- Osaen
- Osage Tribe
- Osaka Flu
- Osaka Monaurail
- Osaka Popstar
- Osaka Punch (Australian rock band, formerly The Kidney Thieves)
- Osaka Syunkasyuto
- Osaki (jazz hop)
- Osaki & Tibeauthetraveler
- Osaki ft. Sleepermane
- Osaki, Nana starring Nakashima, Mika
- Osama GBS
- OsamaSon (underground artist)
- OsamaSon feat. Che
- Osanna
- Osanzi
- Osasioo (Canadian RnB Artist)
- Osatia
- Osawa, Shinichi
- Osay (American rapper, singer-songwriter)
- Osaze feat. Veda, Jaidene
- Osborn, Abigail
- Osborne Brothers, The
- Osborne Brothers, The & Allen, Harley "Red"
- Osborne Brothers, The & Wiseman, Mac
- Osborne, Anders (US singer-songwriter)
- Osborne, Bertín
- Osborne, Bobby
- Osborne, David (Classical/covers pianist)
- Osborne, Dean
- Osborne, Jeffrey
- Osborne, Jeffrey feat. Braun, Rick
- Osborne, Jeffrey feat. Warwick, Dionne
- Osborne, Jeffrey feat. Washington, Kamasi
- Osborne, Joan
- Osborne, Joan feat. Helm, Amy, Greene, Jackie & Randolph, Robert
- Osborne, Joan feat. Pavarotti, Luciano & East London Gospel Choir
- Osborne, Kent (Punk rapper)
- Osborne, Kent & ZAND
- Osborne, Lee feat. Emery, Roxanne
