- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- Okuda, Tamio
- Okudzhava, Bulat
- Okugawa, Hideki
- Okui, Masami
- Okulus
- Okumoto, Ryo
- Okumoto, Ryo (Ryo Okymoto, keyboardist)
- Okumu, Dave
- Okupnik, Tatiana
- Okuş, Seha
- Okuto
- Okvsho (Georg & Christoph Kiss)
- Okvsho feat. Sreya
- Okwizi
- Okwudili, Okoli
- OkYm Riim
- Ol Zico
- Ol' Skool (R&B Group)
- Ol' Skool feat. Xscape & Sweat, Keith
- Ol’ 55
- Ol’ Burger Beats
- Ol’ Dirty Bastard (Wu‐Tang founder, NYC rapper/producer)
- Ol’ Dirty Bastard & Kelis
- Ol’ Dirty Bastard & Wray, Nicole
- Ol’ Dirty Bastard feat. Cappadonna
- Ol’ Dirty Bastard feat. Kelis
- Ol’ Dirty Bastard feat. Kelis
- Ol’ Dirty Bastard feat. Method Man
- Ol’ Dirty Bastard feat. Method Man & Raekwon
- Ol’ Dirty Bastard feat. Method Man and Raekwon
- Ol’ Dirty Bastard feat. Raekwon, Method Man & Gray, Macy
- Ol’ Dirty Bastard feat. Rhymefest
- Ol’ Dirty Bastard feat. Rock, Chris
- Ol’ Dirty Bastard feat. Rock, Chris
- Ol’ Dirty Bastard feat. RZA
- Ol’ Kainry
- Ol’ Kainry & Jango Jack
- Ol’ Kainry feat. Jihane
- Ol’ Kainry feat. Youssoupha
- Ola (Ola Svensson)
- Ola (British)
- Ola & the Janglers
- Ola Podrida
- Ola que quería ser Chau, La
- Ola, Andre
- Oladipo, Victor (NBA basketball player performed on The Masked Singer TV show)
- Oladokum, Joy
- Oladokum, Joy ft. McRae, Jensen
- Oladokum, Joy with Penny and Sparrow
- Oladokun, Joy
- Oladokun, Joy & Stapleton, Chris
- Oladokun, Joy & Tim Gent
- Oladokun, Joy feat. Stapleton, Chris
- Oladokun, Joy ft. McRae, Jensen
- Oladokun, Joy with Manchester Orchestra
- Oladokun, Joy with Morris, Maren
- Oladokun, Joy with Penny and Sparrow
- Olaf & Hans (Folk Pop Party)
- Ólafur Arnalds (Icelandic multi‐instrumentalist and producer)
- Ólafur Arnalds & Dan, Arnór
- Ólafur Arnalds & Frahm, Nils
- Ólafur Arnalds & JFDR
- Ólafur Arnalds & Ott, Alice Sara
- Ólafur Arnalds and Frahm, Nils
- Ólafur Arnalds feat. Dan, Arnór
- Ólafur Arnalds feat. JFDR
- Oláh Gergő
- Oláh, Ibolya
- Olaisen, Ylva (Norwegian pop artist)
- Olaisen, Ylva & Brenner, Stig
- Olaiya, Victor (Nigerian trumpeter)
- Olakira (Adefemi Ebenezer, Nigerian producer)
- Olam Ein Sof ("Olam Ein Sof" translates to "World of the Infinites")
- Olamide (Nigerian Hip Hop artist)
- Olamide feat. Phyno
- OLAN (electronic/alternative singer‐songwriter, producer, multi‐instrumentalist)
- Olan, Ray y su Sasón
- Olander, Jeremy
- Olaniran, Tunde
- Olare Utseoritsenere Prosper
- Olari, Silvia
- Olasoji, Wale
- Olathia (Heavy metal band from Cleveland, Ohio)
- Olatuja, Michael (UK electric and acoustic bassist/composer, based in New York)
- Olatunji (alias for Olatunji Yearwood. Trinidadian soca artist.)
- Olatunji, Babatunde
- Olay, Ruth
- Olcay, Zuhal
- Olcay, Zuhal & Onural, Cengiz
- Old (grindcore / industrial metal band, aka O.L.D.)
