- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- Olivia Project, The
- Olivia the Band
- Olivia Tremor Control, The
- Olivia, Beren (UK singer-songwriter)
- Olivia, Chelsea
- Olivia, Chika
- Olivia's World
- Olivier Heim (Olivier Heim is a Dutch songwriter and performer also known as a member of Très.b and Anthony Chorale.)
- Olivier, Christian
- Olivier, Franck
- Olivier, Géraldine
- Olivier, Jérémy (Producer, composer, and DJ)
- Olivier, Samuel
- Olivor, Jane
- Olivver the Kid
- Olivyah
- Ollabelle
- Ollano
- Ollella
- Ollero, Jay
- Ollie (Finnish singer‐songwriter Olli‐Matti Kalliosaari)
- Ollie (Canadian rapper)
- Ollie & Jerry
- Ollie Dixon
- Ollie feat. CHRIS YONGE
- Ollie feat. Rosanio, Annamarie
- Ollie feat. SONNY
- Ollie feat. Stewart, Kolton
- Ollie joe
- Ollie Joseph
- Ollie MN
- Ollie, Peppermint
- Olliver, Julia
- Olly Anna
- Olly Molly
- Olmeca
- Olmerová, Eva
- Ölmez, Orhan
- Olmos
- Olmos, Walter
- OLMS
- Olms, The
- Olney, David
- OLNL (korean rapper)
- Olodum
- Olof Wallberg
- Olomana
- Olomidé, Koffi
- Olomidé, Koffi & Quartier Latin
- Olomidé, Koffi feat. Gawlo, Coumba
- Olotila
- Olrait's, The
- Ols (one-woman project from Poland)
- Olsen & Fu (Two polish rappers)
- Olsen Brothers
- Olsen, Allan (Danish folkrock musician)
- Olsen, Angel
- Olsen, Angel & Simpson, Sturgill
- Olsén, Daniel
- Olsen, Egil
- Olsen, Egil S.
- Olsen, George, and His Music
- Olsen, Jon Flemming
- Olsen, Jørgen
- Olsen, Kristina
- Olsen, Lenay
- Olsen, Lynn (Dutch artist)
- Olsen, Troy
- Olsenbanden jr.
- Olson (German rapper)
- Olson, Alix
- Olson, Carla
- Olson, Carla & Clark, Gene
- Olson, Carla & Taylor, Mick
- Olson, Danny
- Olson, Evan
- Olson, Luke
- Olson, Mark (US alt. country musician, Jayhawks etc)
- Olson, Mark & Creekdippers, The
- Olson, Mark & Louris, Gary
- Olson, Mark & The Creekdippers
- Olson, Mark and the Original Harmony Ridge Creekdippers
- Olson, Michael (US christian singer, songwriter & drummer)
- Olson, Olivia (American actress, singer-songwriter)
- Olsson (key track “Hold On”)
- Olsson feat. Mapei
- Olsson, Albin
- Olsson, Björn
- Olsson, Felicia
- Olsson, Kurt
