- O
- OO
- OO
- OO
- OOaf
- OAFOaK
- OakOBE
- ObeObn
- OBO
- Oce
- OceOCS
- OCTOct
- OctOdd
- OddODE
- ODEOdo
- OdoOf
- OfOff
- OffOff
- OffOgr
- OgrOh
- ohOHM
- OHNOiz
- OizOka
- OkaOkl
- OklOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OLIOls
- OlsOlz
- OmOma
- OmaOme
- OmeOmo
- Omo
- One
- OneOne
- ONEOne
- OneONE
- OneOnl
- OnlONR
- OnsOok
- OokOPE
- OpeOPF
- OPFopt
- OptOra
- OraOrb
- OrbOrc
- OrcOrc
- OrcOre
- OreOrg
- OrgOri
- OriOrk
- OrkOrn
- OrnOrq
- OrqOrr
- OrrOrt
- OrtOsb
- OsbOsc
- OscOsl
- OslOst
- OstOte
- OteOto
- OtoOtt
- OttOub
- OubOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOwl
- OwlOxo
- OxoOzc
- OzcOzu
- Ozuozz
- Okamoto Reiji (OKAMOTO'S)
- Okamoto, Mayo
- Okamoto, Nobuhiko
- OKAMOTO’S
- OKAMOTO’S × RIP SLYME
- Okamura, Takako
- Okamura, Yasuyuki
- OKAN (Canadian afro-cuban duo)
- Okan, Cem
- Okan, Cihan
- Okan, Tanju
- Okandeji Adedayo Olamilekan
- Okapi
- Okashii
- Okasian (Korean-American rapper & singer)
- OKAWARI, DJ
- OKAWARI, DJ feat. Amadori
- OKAWARI, DJ feat. Amanda Diva
- OKAWARI, DJ feat. Campbell, Brittany
- OKAWARI, DJ feat. Kamiya, Eri
- 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
- Okayracer
- 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
- Okello Max & Bensoul
- Okello Max & Charisma
- Okello Max & Owiyo, Suzanna
- Okello Max & Watendawili
- Oker
- Okereke, Kele
- Okereke, Kele & Ejeca
- Okereke, Kele feat. Alexander, Olly
- Okereke, Kele feat. Bailey Rae, Corinne
- Oketo
- Okey Dokey (2010s psych soul)
- Okey-iwobi, Brendan
- Okey, Ixie (Ugandan pop artist)
- okgiorgio (Giorgio Pesenti)
- okgiorgio & Estremo
- okgutta
- 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 & underscores
- Oklou feat. Bladee
- Oklou feat. Casey MQ
- Oklou feat. Pomme & Harle, Danny L
