- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- oblObs
- ObsOce
- OceOch
- OchOCT
- OctODC
- ODCOdd
- OddOde
- OdeODU
- ODUof
- ofOFF
- OffOFK
- OfMOgr
- OgrOh
- OhOhi
- OhiOim
- OimOK
- OKOke
- OkeOl
- OlOl
- OlaOld
- OldOle
- OleOlg
- OlgOli
- OliOli
- OliOls
- OlsOma
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneOnk
- OnkOno
- OnoOny
- OnyOos
- OosOpe
- OpeOPL
- OPMOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriORK
- OrkOro
- OroOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOSK
- OskOss
- OssOta
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOza
- OzaOzo
- OzoOzz
- OK KID feat. Gerard
- OK KID feat. Mädness
- OK KID feat. Megaloh
- OK KID feat. Raffi Balboa, Veedel Kaztro & LGoony
- OK KID feat. Spilker, Frank
- Ok Moon
- OK PANDA (Belgian electro pop/rock band)
- OK Pirámides
- OK Satán
- OK Social Club, The
- OK Sweetheart
- Ok, Ju Hyun
- Ok, Taecyeon
- OK. Volca
- ok2222 (beatmaker)
- OKA (Australian band)
- Oka Wi Ortega
- OKAAY
- Okabayashi, Kazuma (Japanese ambient / drone musician)
- Okabayashi, Nobuyasu
- Okabe (Canadian Artist)
- Okabe, Keiichi
- Okabe, Mina (Danish-Japanese singer-songwriter)
- Okada, Laryssa
- Okada, Tohru
- Okada, Yukiko
- Okafor, Ben
- Okakita, Ayu
- Okali
- Okaly, Kyle
- Okami Sky
- Okami, Alex (Arizona post-punk)
- Okamoto Reiji (OKAMOTO'S)
- Okamoto, Maiko
- Okamoto, Mayo
- Okamoto, Nobuhiko
- OKAMOTO’S
- OKAMOTO’S × RIP SLYME
- Okamura, Takako
- Okamura, Yasuyuki
- OKAN (Canadian afro-cuban duo)
- 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. Jumelles
- 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
- Okayuka
- 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 & FEMI ONE
- 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)
