- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOCN
- OCnOD
- ODAOde
- OdeOdr
- OdrOfe
- OfeOfM
- OfnOh
- OhOhg
- OhiOje
- OjeOke
- OkeOla
- OlaOld
- OldOle
- OleOli
- OliOll
- OllOly
- OlyOme
- OmeOmn
- OmnOnc
- OncOne
- OneOne
- OneOni
- ONIOno
- OnoOom
- OomOpe
- OpeOps
- OpsOra
- OraOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOrl
- OrlOrq
- OrqOrt
- OrtOsa
- OsaOse
- OshOsp
- OspOte
- OteOtt
- Ott
- OOut
- OutOut
- OutOut
- OutOve
- OveOV
- OVROwl
- OwlOZ
- OzOZw
- OZwOZZ
- Orthodox Celts
- Orthostat
- orti (electronic/electroclash/techno project)
- Orties
- Ortiga (Former Esteban & Manuel member)
- Ortiz, Alfredo (player of the Paraguayan harp)
- Ortiz, Bill
- Ortiz, Coqui
- Ortiz, Gerardo (Regional Mexican singer)
- Ortiz, Joell (rapper fka Jo‐ell Quikman)
- Ortiz, Joell feat. Akon
- Ortiz, Joell feat. Bruja, La
- Ortiz, Joell feat. Immortal Technique
- Ortiz, Joell feat. Novel
- Ortiz, Kevin
- Ortiz, Luis “Perico”
- Ortiz, Paul y La Orquesta Son
- Ortize, Brian
- Ortolani, Riz
- Ortolani, Riz feat. Ranieri, Katyna
- Orton, Beth
- Orton, Beth feat. Callier, Terry
- Orton, Mark
- Ortopedia Técnica (Garage Punk band from Castellón de la Plana)
- ortoPilot
- Ortsul (Poland / Black Metal)
- Oruã (Brazilian group)
- Oruç, Mustafa
- Orup (Swedish musician Hans Thomas Eriksson)
- Örvarsson, Atli (Icelandic score composer)
- Orville Peck
- Orville Peck & Beck
- 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
- Orville Peck & Russell, Allison
- Orville Peck & Swims, Teddy
- Orville Peck, Minogue, Kylie & Diplo
- Orville Peck, Osborne, TJ, Payne, Waylon & Hagood, Fancy
- Orville Peck, Tuttle, Molly & Golden Highway
- Orvokki
- Orwell (French band)
- Orwells, The
- Orxata Sound System
- Ory, Kid
- Oryad (doom metal/symphonic metal group)
- Oryema, Geoffrey
- oryl
- Orzabal, Roland (UK musician, songwriter and producer)
- OS (German duo)
- Os 3 do Nordeste
- Os Atuais
- Os Bardos
- Os Borges
- Os Cretinos
- Os Dentes
- Os Extintos
- Os Garotin
- 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 Vips
- Os Vips (Os Vips)
- OS101 (hardcore punk band)
- Osa (El Caco frontman Øyvind Osa's solo project)
- 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 ft. Sleepermane
- Osaki, Nana starring Nakashima, Mika
- OsamaSon (underground artist)
- Osanna
