- O
- OO
- OO
- OOak
- OakOb
- ObeObo
- OBOOce
- OceOch
- OchOct
- Odd
- OddODM
- ODOOf
- OfOff
- OFFOgr
- OgrOh
- OhOIR
- OirOKA
- OkaOku
- OkuOla
- OlaOld
- OldOli
- OliOli
- OliOls
- OlsOMA
- OmaOme
- OmeOmo
- OMPOnd
- One
- OneOne
- OneOni
- OniOno
- OnoOom
- OomOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrc
- OrcOrg
- OrgOri
- OriOrk
- OrkOrp
- OrpOrr
- OrrOrv
- OrvOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOug
- OugOut
- OutOut
- OutOut
- OutOve
- Oveovr
- OVSOwl
- OwlOxy
- Oxy
- ozz
- Okamura, Takako
- Okamura, Yasuyuki
- OKAN (Canadian afro-cuban duo)
- Okan, Cem
- Okan, Cihan
- Okan, Tanju
- Okandeji Adedayo Olamilekan
- Okapi
- Okasian (Korean-American rapper & singer)
- OKAWARI, DJ
- OKAWARI, DJ feat. Amadori
- OKAWARI, DJ feat. Amanda Diva
- OKAWARI, DJ feat. Campbell, Brittany
- OKAWARI, DJ feat. ERIKO
- OKAWARI, DJ feat. Jumelles
- 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 Alright
- Okay Kaya (Kaya Wilkins)
- Okay Mann
- okayceci
- okaywill (will)
- Okazaki, Ritsuko
- Okazaki, Taiiku
- OKDAL
- Okean Elzy
- 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
- Okis (french rap)
- Okkervil River
- Okkervil River & Antlers, The
- Okkosch, Samuel
- Okktli
- Okkultist
- OKKUPADO
- Oklahoma Kid, The
- Oklahoma Kid, The & Consvmer
- Oklahoma Uprising
- Oklou
- Oklou & Berger, Flavien
- Oklou & Casey MQ
- Oklou feat. Bladee
- Oklou feat. Casey MQ
- Oklou feat. Pomme & Harle, Danny L
- Oklou feat. Zero Castigo
- Oklou ft. Bladee
- Oklou ft. underscores
- Okmalumkoolkat
- OKO TYGRA
- Okomfour Kwadee (Kwadee)
- Okon, James
- Okou
- Okoumé
- Okra Playground
- Oksanen, Ritva
- Okta Logue
- Oktae
- Oktet (Oktet Praha)
- Oktobar 1864
- Oktober, Ingeborg
- Oktoberklub
- Oktoplut
- Oktor
- Oku, Hanako
- Okuda, Tamio
- Okudzhava, Bulat
- Okugawa, Hideki
- Okui, Masami
