- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOCT
- OctODD
- OddOdm
- ODMof
- OfOff
- OffOh
- OhOHK
- OhkOjo
- OjoOki
- OkkOla
- OLAOld
- OldOli
- OliOli
- OliOls
- OlsOme
- OmeOmn
- OmnOnc
- One
- OneOne
- OneOnl
- OnlONY
- OnyOpe
- OpeOpi
- OpiOra
- OraOrb
- OrbOrd
- OrdOrg
- OrgOri
- OriOrm
- OrmOrq
- OrqOrw
- OrxOsc
- OscOsl
- OsmOsz
- OszOts
- Ots
- Out
- OutOut
- OutOut
- OutOve
- OveOwe
- OweOxf
- Oxf
- OZZ
- Okkervil River
- Okktli
- Okkultist
- Oklahoma Kid, The
- Oklahoma Uprising
- Oklou
- Oklou feat. Casey MQ
- Oklou feat. Pomme & Harle, Danny L
- Oklou feat. Zero Castigo
- Okmalumkoolkat
- OKO TYGRA
- Okomfour Kwadee (Kwadee)
- Okon, James
- Okou
- Okoumé
- Okra Playground
- Oksanen, Ritva
- Okta Logue
- Oktet (Oktet Praha)
- Oktobar 1864
- Oktober, Ingeborg
- Oktoberklub
- Oktoplut
- Oktor
- Oku, Hanako
- 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)
- 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. Raekwon, Method Man & Gray, Macy
- 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
- Olaf & Hans (Folk Pop Party)
- 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