- O
- OO
- OO
- OO
- OOak
- OakObe
- ObObl
- OblObv
- obyOce
- OceOco
- OCSOct
- OctOdd
- oDDOde
- OdeOdy
- OdyOfe
- OfeOff
- OFFOge
- OgeOh
- OhOHK
- OhkOiz
- OizOka
- OkaOkr
- OKS
- Old
- OldOle
- OleOli
- OliOli
- OliOln
- OLNOly
- OlyOMB
- OMBOmi
- OmiON
- onOnd
- OndOne
- OneOne
- OneOne
- OneONL
- ONLono
- OnoOok
- OokOpe
- OpeOph
- OphOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOre
- OreOrg
- OrgOri
- OriOrk
- OrkOro
- OroOrq
- OrqOrt
- OrtOs
- OsOsb
- OsbOsi
- OsiOso
- OsoOsz
- OszOti
- OtiOtt
- OttOUB
- OubOur
- OurOut
- OutOut
- OutOuy
- OuzOve
- OveOvi
- OviOwe
- OweOxf
- Oxf
- OzaOzu
- Ozuozz
- Os Bardos
- Os Borges
- 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 (Composer in Japan)
- 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
- Osborne, Sonny
- Osborne, Steven (pianist)
- Osborne, Tony
- Osbourne, Johnny (Jamaican reggae singer)
- Osbourne, Johnny & Sensations, The
- Osbourne, Johnny meets Roots Radics
- Osbourne, Johnny Meets Roots Radics
- Osbourne, Kelly
- Osbourne, Ozzy
- Osbourne, Ozzy & Osbourne, Kelly
- Osbourne, Ozzy & Rhoads, Randy
- Osbourne, Ozzy feat. Beck, Jeff
- Osbourne, Ozzy feat. Clapton, Eric
- Osbourne, Ozzy feat. Iommi, Tony
- Osbourne, Ozzy feat. Iommi, Tony & Wu‐Tang Clan
- Osbourne, Ozzy feat. John, Elton
- Osbourne, Ozzy feat. McCready, Mike
- Osbourne, Ozzy feat. Osbourne, Kelly
- Osbourne, Ozzy feat. Post Malone
- Osbourne, Ozzy feat. Primus
- Osbourne, Ozzy feat. Rhoads, Randy
