- O
- OO
- OO
- OO
- OOak
- OakOb
- ObObl
- OblOC
- OCOce
- OCEOct
- OctOcu
- OcuOdd
- OddOdi
- OdiODZ
- OeOff
- OffOff
- Offogo
- ogoOh
- OhOHN
- OhnOje
- OjeOKA
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- Ols
- OmaOme
- OmeOmn
- OmnOna
- OnaOne
- OneONE
- Oneone
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpp
- OprORA
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrq
- OrqOrs
- OrsOru
- Osb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtt
- OttOtw
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- Oweox
- OxaOys
- OysOzr
- OZRozz
- Olson, Jules (singer-songwriter)
- 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 Ingemar
- Olsson, Albin
- Olsson, Björn
- Olsson, Felicia
- Olsson, Kurt
- Olsson, Leif "Loket"
- Olsson, Linnea (singer‐songwriter and cellist)
- Olsson, Nigel
- Olsson, P.J.
- Olsson, Viktor (Swedish singer/songwriter)
- Olstead, Renee
- Olstead, Renee feat. Botti, Chris
- Olsthoorn, Alice (Dutch Hyperpop artist)
- Olszakumpel
- OLTAS (Oldskool doom- en deathmetal uut 'e Walden!)
- Oltmans, Tinne (Belgian actress & singer)
- Olu Maintain
- OLUGBEMI, JOSEPH (UK Artist)
- Olusola, Kevin
- Oluwajesse
- Ölveti Blues Band
- Olvidados, Los (Skate punk band from San Jose, CA)
- Olvidados, Los (Bolivian band)
- Olvido (melodic/gothic metal)
- Oly (American singer-songwriter, Lianna Sylvan)
- Oly (@Southwrld_9)
- Oly. (from Poland, on Nextpop label)
- Olymp (german metal band)
- Olympe (French singer of The Voice 2)
- Olympia (Melbourne singer)
- Olympians (Norwich Crunch Pop band)
- Olympic (Czech big beat band)
- Olympic Ayres
- Olympic Runners
- Olympic Swimmers
- Olympic Symphonium, The
- Olympics, The (US doo wop group)
- Olympiou, Despoina (Despoina Olympiou)
- Olympique
- Olympos Mons (Finnish power metal band)
- Olympus Mons
- Olzon, Anette
- Om (US stoner/doom metal band)
- Om (Lost at Last)
- OM ("Singer" "Sober" "Reezons")
- om la luna
- Om Unit
- OMA (Hip-hop instrumentals)
- Oma 206
- Oma Hans
- Omagh Community Youth Choir
- Omaha feat. Holt, Fiona
- Omaji, Tim (Australian singer-songwriter formerly known as Timomatic)
- OMAO & NADARO
- Omar (British soul singer Omar Lye-Fook)
- Omar (German Schlager singer)
- Omar (R&B)
- Omar (German hip-hop)
- Omar (US rapper)
- OMAR (German rapper)
- OMAR & AK 33
- OMAR & NGEE
- Omar & Stone, Angie
- Omar & Zed Bias
- Omar and Eastern Power, The
- Omar and the Howlers (Blues Rock, Jump-Blues, US)
- Omar Codazzi
- Omar Courtz (Joshua Omar Medina Cortes)
- Omar Courtz & Bad Gyal
- Omar Courtz & Bad Gyal
- Omar Courtz & ROA
- OMAR EC
- Omar Enrique
- Omar Enrique feat. Herrera, Eddy
- Omar Enrique feat. Ilegales
- Omar feat. Palladino, Pino
- Omar feat. Schwarz, Henrik
- Omar feat. Stone, Angie
- Omar feat. Zed Bias
- Ómar Guðjónsson
