- 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
- Ostrogoth (Belgian metal band)
- Ostrowska, Małgorzata
- Ostura (Lebanese heavy/power metal)
- Ostyn (Project of Bert Ostyn)
- Ostzonensuppenwürfelmachenkrebs
- Osukaru (Melodic Rock | AOR | Progressive Rock)
- Osunlade
- Osunlade & James, Maiya
- Osunlade feat. Divine Essence
- Osunlade feat. James, Maiya
- Osunlade feat. Oveous Maximus
- Osvajači (Serbian hard rock/heavy metal band)
- Osvaldo (Los Angeles based beatmaker & producer)
- Osvaldo Ayala
- Osvaldorio
- Oswald (German medieval and renaissance group)
- Oswald (a trio, project of Andrea Rottin)
- Oswald (Zouk Singer)
- Oswald, Marianne
- Oswaldir & Carlos Magrão
- Oswalt, Patton
- Oszajca, John
- Oszibarack
- OT (Belgian pop singer Olivia Trappeniers)
- OT the Real
- OT7 Quanny
- Otaam
- Ōtaki, Yūko (singer)
- Otala (Post-rock quartet from Nottingham, UK)
- Otani, Kow (Japanese anime, film & video game composer)
- Ōtani, Tomoya
- Ōtani, Tomoya feat. Kirk-Holmes, Merry
- Ōtani, Tomoya feat. NateWantsToBattle
- Otargos
- Otarion
- Otava Yo
- otay:onii
- OtC
- OTE
- OTE feat. Ellis, Steven
- Otecko (Slovak MC (H16))
- Otecko feat. Cigo & Igor
- Otecko feat. Smack
- Otecko feat. Spirit, Majk
- Otem Rellik
- Otenki
- Otep
- Otero, Adrián
- Otero, David (00s Spanish musician)
- Otero, David & Adelén
- Otero, David & Basarte, Bely
- Otero, David & Carlos Sadness
- Otero, David & Cepeda
- Otero, David & Fernández, Dani
- Otero, David & Guerra, Ana
- Otero, David & Mäbu
- Otero, David & Soto, Marta
- Otero, David & Taburete
- Otero, David feat. Torres, Iván
- Otero, David, Nil Moliner & Arnau Griso
- Otero, Manolo
- otetsu
- otetsu feat. GUMI
- Otey, Lisa
- OTF Boonie Moe
- OTF Boonie Moe, Rob49 & Only the Family
- Otgoo
- OTH
- Otha (Othalie Husøy)
- Othalan (Polish Folk Metal)
- Othello (Théo Celino)
- Other Colors, The
- Other Ego
- Other End, The (Norwegian duo)
- Other Favorites, The
- Other Guys, The (Scottish A Cappella Group)
- Other Guys, The (US hip-hop duo)
- Other Half, The (’60s San Francisco psychedelic rock band)
- Other Lives (US indie rock band)
- Other Men
- Other Minds (Alternative Rock Band)
- Other Ones, The (Australian-German band, hit single "Holiday")
- Other Other Brothers, The
- Other Stars, The (Indie Rock)
- Other Tribe, The
- Other Two, The
- Other Voices (Italian goth)
- Other Years, The
- Other-ed
- Other, The (horrorpunk band from Germany)
