- O
- OO
- OO
- OO
- OOak
- OakObe
- ObeObr
- ObrOcc
- OccOce
- OceOct
- OctOdd
- OddODE
- ODEOds
- OdsOfe
- OfeOFF
- OffOGI
- OgiOh
- OhOHN
- OhnOje
- OjeOka
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- OlsOma
- OmaOme
- OmeOmo
- OmoOnc
- OncOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOok
- OokOpe
- OpeOph
- OpiOQu
- Oquora
- ORAOrb
- OrbOrc
- OrcOre
- OreOri
- OriOri
- OriOrl
- OrlOrp
- OrpOrq
- OrqOrt
- OrtOsa
- OsbOsc
- OscOsm
- OsmOST
- OSTOth
- OthOtt
- OttOtt
- OtuOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxi
- OxiOzb
- OzbOzu
- Ozuozz
- Oakes, Laura (country music singer from Liverpool, UK)
- Oakey, Philip & Moroder, Giorgio
- Oakey, Philip & Moroder, Giorgio
- Oakey, Philip with Moroder, Giorgio
- Oakhands
- OAKK
- Oakk, Breezy
- Oakland, Guy
- Oakland, Mark
- Oakland, Max
- Oakley Riot
- Oakley, Charly (Australian singer/songwriter)
- Oakley, Michael (U.K. synthwave artist/producer)
- Oakley, Michael feat. Phoenix, Dana Jean
- Oakman (French band)
- Oaks & Fahia (Spanish prog group)
- Oaks Worship
- Oaks, Chris (christian rapper)
- Oaks, Ely
- Oaks, Ely & Lavinia Hope
- OaKs, The
- Oakstones, The
- Oaktree (Belgian electronic music producer)
- Oakwite
- Oakwood
- Oakwood Station
- Oanh, Hoàng
- Oanh, Hoàng & Trung Chỉnh
- Oar (Australia, Metal)
- Oasis (Noel & Liam Gallagher)
- Oasis (Omar-S and Shadow Ray)
- Oasis (’70s US rock band)
- Oasis 4you (Mexican Christian music group)
- Oasis Chorale
- Oasis Ministry (Christian band)
- Oasis Worship
- Oates, Jackie
- Oates, Jackie & Spiers, John
- Oates, John
- Oath (An alias of Steven Waddell, used in this Heavy Metal solo project based in Edinburgh, Scotland, UK, started in 2018.)
- Oath to Order (USA metalcore/deathcore)
- Oath, Das
- Oath, The (German heavy doom metal)
- Oathbreaker (Belgian post‐black metal band)
- Oathean (Korea / Melodic Black/Death Metal)
- Oathless
- Oaths, The
- Oatmello
- Oats, Case
- Oattes, Bernard
- Oatumn
- Oaty. (lo‐fi artist)
- OAU (OVERGROUND ACOUSTIC UNDERGROUND)
- OB (DnB Producer (North London))
- OB OBrien feat. Drake & Preme
- Oba Oba Samba House
- Obadiah Parker
- Obake
- Obani (Obani)
- Öbarna
- Obas, Beethova
- Obata, Minako “mooki”
- Obata, Takahiro (jazz pianist, keyboardist)
- OBB (Oswald Brothers Band)
- Obbie Messakh (Artist of JK Records)
- Obe Dve
- Obè, Amir
- Obè, Amir feat. PARTYNEXTDOOR
- Obè, Amir feat. Sostre, Eli
- Obed Marsh (Australian black/doom metal)
- Obediencia (Madrid Punk)
- Obedient Wives Club
- Obel, Agnes (Danish singer)
- Oben, Cahit
- Obenski, Amy
- Ober, Hermann
- Oberbaum (German/Belgian artist Lucie Rezsöhazy)
- Öberg, Mats
- Oberhofer
- Oberhofer, Brad
- Oberkampf
- Oberle, Gregory
- Oberlin, Karen
- Oberon (space metal band from Ada, Oklahoma, USA)
- Oberpichler, Rale
- Oberritter Dóra ft. Lotfi, Begi
- Oberschlesien
- Oberst, Conor
- Oberst, Conor & Blondshell
- Oberst, Conor and Mystic Valley Band, The
