- O
- OO
- OO
- OOak
- OakObi
- ObiObt
- ObuOce
- OceOct
- OctOdd
- OddODM
- ODOOf
- OfOfn
- OfoOH
- OHOHN
- OhnOK
- OKOko
- OkrOld
- OldOld
- OldOli
- OliOll
- OllOm
- OMAOme
- OmeON
- onOne
- OneOne
- OneOne
- OneOnl
- OnlOom
- OomOpe
- OpeOpt
- OptOra
- OraOrc
- orcOre
- OreOri
- OriOrk
- OrkOrp
- OrpOrt
- OrtOsa
- OsbOSH
- OshOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- Oveovl
- OvnOwl
- OwlOys
- OZOZZ
- Ortega, José (designer)
- Ortega, Lindi
- Ortega, Michael
- Ortega, Paco
- Ortega, Palito
- Ortegon, Sr (José Miguel Ortegón)
- Ortelli, Paolo, Matrix, DJ, Party Boomers feat. C, Jay
- Ortero, David
- Orth, Marisa
- Orthentix
- Orthodox (Spanish doom metal)
- Orthodox (Straight Edge)
- Orthodox Celts
- Orthostat
- orti (electronic/electroclash/techno project)
- Orties
- Ortiga (Chilean canto nuevo group)
- Ortiga (Former Esteban & Manuel member)
- Ortiz, Alfredo (player of the Paraguayan harp)
- Ortiz, Bill
- Ortiz, Gerardo (Regional Mexican singer)
- Ortiz, Joell (rapper fka Jo‐ell Quikman)
- Ortiz, Joell feat. Fat Joe
- Ortiz, Joell feat. Novel
- Ortiz, Kevin
- Ortiz, Luis “Perico”
- Ortiz, Paul y La Orquesta Son
- 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)
- Oruç, Mustafa
- Orup (Swedish musician Hans Thomas Eriksson)
- Örvarsson, Atli (Icelandic score composer)
- Orville Peck
- Orvokki
- Orwell (French band)
- Orwells, The
- Orxata Sound System
- Ory, Kid
- Oryad (doom metal/symphonic metal group)
- Oryema, Geoffrey
- oryl
- Orzabal, Roland
- OS (German duo)
- OS 101
- Os 3 do Nordeste
- Os Atuais
- Os Bardos
- Os Cretinos
- Os Extintos
- Os Garotin
- Os Mateadores
- Os Mulheres Negras
- Os Mundi
- Os Nativos (South-Brazilian gaucho music group)
- Os Pontos Negros
- 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
- Osama GBS
- OsamaSon (underground artist)
- Osanna
- Osanzi
- Osasioo (Canadian RnB Artist)
- Osatia
- Osawa, Shinichi
- Osay (American rapper, singer-songwriter)
- Osaze feat. Veda, Jaidene