- O
- OO
- OO
- OOak
- OakObi
- ObiObt
- ObuOce
- OceOct
- OctOdd
- OddODM
- ODOOf
- OfOfn
- OfoOH
- OHOHN
- OhnOK
- OKOko
- OkrOld
- OldOld
- OldOli
- OliOll
- OllOm
- OMAOme
- OmeON
- onOne
- OneOne
- OneOne
- OneOnl
- OnlOom
- OomOpe
- OpeOpt
- OptOra
- OraOrc
- orcOre
- OreOri
- OriOrk
- OrkOrp
- OrpOrt
- OrtOsa
- OsbOSH
- OshOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- Oveovl
- OvnOwl
- OwlOys
- OZOZZ
- Owl Paws
- Owl Service, The
- Owl Vision
- Owlle
- Owls (rock band from Chicago)
- Owls of the Swamp
- Owls, The
- Owman, Christine
- Öwnboss & Selva
- Öwnboss & Sevek
- Öwnboss, Sevek
- Ownglow (UK drum & bass artist; Sam Reeves)
- Owsey
- Owsley
- owtiss (emoplugg artist)
- Owusu, Genesis
- Owusu, Genesis feat. Callinan, Kirin J
- OWV (Our only Way to get Victory)
- OX (Canadian lo-fi indie rock band)
- Ox (Brighton, UK rock band)
- Ox (rapper Christopher Wilkes, performs on the MadWorld OST)
- OX (german post-grunge Band)
- Ox en Mayo Alto
- Ox, Matt
- ox33n
- Oxa, Anna
- Oxa, Anna & Leali, Fausto
- Oxa, Anna feat. Leali, Fausto
- Oxbow
- Oxen ((Swedish Indie Rock Band))
- Oxford & Co.
- Oxford Camerata (English chamber choir)
- Oxford Camerata, Summerly, Jeremy
- Oxford Collapse
- Oxford Drama
- Oxford, Charlie
- Oxford, Doña
- Oxhole
- Oxia
- Oxia feat. Miss Kittin
- Oxide & Neutrino
- Oxide & Neutrino feat. Harvey
- Oxide & Neutrino feat. Kaish
- Oxide & Neutrino feat. Kowdean
- Oxide & Neutrino feat. Swiss, Skat D, Kaish & Harvey
- Oxidize
- Oxidize (Swedish metal band)
- Oxiplegatz
- Oxlade
- Oxley
- Oxmo Puccino
- Oxmo Puccino & Jazzbastards, The
- Oxmo Puccino feat. Booba
- Oxmo Puccino feat. Caballero & JeanJass
- Oxmo Puccino feat. Célèbre Bauza, Le
- Oxmo Puccino feat. Dany Dan
- Oxmo Puccino feat. Diesel & Dadoo
- Oxmo Puccino feat. Lino
- Oxmo Puccino feat. Slake, Keity
- OXO (early 80s US dance pop group "Whirly Girl")
- Oxo 86
- Oxo 86 feat. André
- Oxo 86 feat. Chris
- Oxo 86 feat. Greg
- Oxo 86 feat. Hans
- Oxo 86 feat. Ole
- Oxon (Polish rapper)
- Oxtoby (Neil Oxtoby)
- Oxxxymiron (Russian rapper)
- Oxyd
- Oxygen (British trance duo)
- Oxygen Destroyer (Seattle Death/Thrash Metal)
- Oxygen feat. Britton, Andrea
- Oxygen Thief
- Oxymoron (German punk rock band)
- Oxymorrons
- Oxys, The (Austin, TX rock band)
- Oy (Swiss/German electro duo Joy Frempong & Marcel Blatti)
- Oya & Bora
- Oyama (band from Iceland)
- Oyatan
- Oyelakin, Tosin
- Oyelana, Tunji
- Öykü & Berk
- Oyls
- Oyster Murders, The
- Oysterband
- Oysterband feat. Tabor, June & Chumbawamba
- Oysterband featuring Celtas Cortos
- Oysterhead