- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObs
- OBSOce
- OceOch
- OchOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OgaOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- OkaOku
- OkuOla
- OlaOld
- Oldold
- OldOle
- OleOli
- OliOli
- OLIOls
- OlsOM
- omOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOob
- OOcOP
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOu
- OuaOUR
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOvt
- OvvOwe
- OweOxh
- OxiOza
- OzaOzo
- OzoOZZ
- OSTER project
- Osterloh, Dora & Phoenix Love
- Ostermann, Willi
- Ostermann, Willi & Orchester
- österreich
- Ostertag, Florian
- Osterwald, Bibi (actress)
- Osterwald, Hazy (Swiss musician, singer and bandleader)
- Osterwald, Hazy, Sextett
- Ostiaputa (Real band name is without space)
- Ostiaputa
- Ostinato (Jazzband)
- Ostkreutz
- Ostkurve, DJ
- OSTON
- OSTON & Audiotree
- OSTON & JORDY
- OSTON & Sanderson, Lauren
- ostooandell
- Ostoura, Hamo El
- Ostracist (gothic metal band from Greece)
- Ostrar, Adam
- Ostras, Os
- Ostrich Bouquet
- Ostrich Head
- Östro 430
- Ostrogoth (Belgian metal band)
- Ostrowska, Małgorzata
- Ostura (Lebanese heavy/power metal)
- Ostyn (project of Bert Ostyn)
- 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 (house, techno, pop collective from berlin)
- Oswald & Graf, Esther
- Oswald & Revelle
- Oswald, Marianne (French singer and actress)
- Oswaldir & Carlos Magrão
- Oswalt, Patton
- Oszajca, John
- Oszibarack
- OT (Belgian pop singer Olivia Trappeniers)
- OT the Real
- OT the Real, Statik Selektah & Merkules
- OT7 Quanny
- Otaam
- Otai, Mounir
- Ōtaki, Yūko (singer)
- Otaku (Ren Avel)
- 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
- Ōtani, Tomoya feat. Quinn, Kellin
- Otargos
- Otarion
- Otava Yo
- otay:onii
- OTB Fastlane
- 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
