- O
- OO
- OO
- OO
- OOak
- OakOb
- ObObl
- OblOC
- OCOce
- OCEOct
- OctOcu
- OcuOdd
- OddOdi
- OdiODZ
- OeOff
- OffOff
- Offogo
- ogoOh
- OhOHN
- OhnOje
- OjeOKA
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- Ols
- OmaOme
- OmeOmn
- OmnOna
- OnaOne
- OneONE
- Oneone
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpp
- OprORA
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrq
- OrqOrs
- OrsOru
- Osb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtt
- OttOty
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxa
- OxbOZ
- Oz
- ozz
- OKAWARI, DJ feat. Meyer, Emi
- OKAWARI, DJ feat. San, Woong
- OKAWARI, DJ feat. Styler, Emily
- OKAWARI, DJ feat. Tekitha
- Okay (Marty Anderson's California indie rock project)
- OKAY (also: O.K., pop group from Frankfurt, Germany ("Okay!"))
- Okay Alright
- Okay Kaya (Kaya Wilkins)
- Okay Kaya feat. Zannie
- Okay Mann
- okayceci
- okaywill (will)
- Okazaki, Ritsuko
- Okazaki, Taiiku
- Okda
- OKDAL
- Okean Elzy
- Okean Elzy, Del Naja, Robert, Vakarchuk, Svyatoslav
- Okee Dokee Brothers, The
- Okeefe, Josh
- Okehazama, Alisa
- Okehazama, Alisa
- Okello Max
- Oker
- Okereke, Kele
- Okereke, Kele feat. Alexander, Olly
- Okereke, Kele feat. Bailey Rae, Corinne
- Oketo
- Okey Dokey (2010s psych soul)
- Okey, Ixie (Ugandan pop artist)
- okgiorgio (Giorgio Pesenti)
- okho
- OKI (Polish MC)
- Okills
- Okills feat. Guevara, Laura.
- Okilly Dokilly
- Okin (Indonesian musician)
- Okin, Earl
- Okinawa Lifestyle
- Okino, Shuntaro
- Okino, Shūya feat. Duplaix, Vikter
- Okis (french rap)
- Okis & Mani Deïz
- OKISO (oxo)
- OKISO, GUMI
- Okken, Rinus
- Okkervil River
- Okkervil River & Antlers, The
- Okkosch, Samuel
- Okktli
- Okkultist
- OKKUPADO
- Oklahoma Kid, The
- Oklahoma Uprising
- Oklou
- Oklou & Berger, Flavien
- Oklou & Bladee
- Oklou & Casey MQ
- Oklou feat. Bladee
- Oklou feat. Casey MQ
- Oklou feat. Pomme & Harle, Danny L
- Oklou feat. Zero Castigo
- Oklou ft FKA twigs
- Oklou ft. Bladee
- Oklou ft. underscores
- Okmalumkoolkat
- OKO TYGRA
- Okomfour Kwadee (Kwadee)
- Okon, James
- Okou
- Okoumé
- Okra Playground (Finnish Electro folk band based in Helsinki)
- OKS (Ukrainian pop artist)
- Oksanen, Ritva
- Okta Logue
- Oktae
- Oktaves, The
- Oktet (Oktet Praha)
- Oktobar 1864
- Oktober, Ingeborg
- Oktoberklub
- oktobernatt
- Oktoplut
- Oktor
- Oku feat. Spekti & Eklund, Annika
- Oku feat. Teflon Brothers & Günther
- Oku, Hanako
- Okuda, Tamio
- Okudzhava, Bulat
- Okugawa, Hideki
