- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblOBS
- ObtOce
- OceOch
- ochOct
- OctOdd
- OddOde
- OdeOdi
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OGBOh
- OhOha
- OhaOi
- OiOjo
- OjoOka
- okaOku
- OkuOla
- OlaOld
- OldOld
- OleOle
- OleOli
- OliOLI
- OliOls
- Olsom
- OmOma
- OmaOme
- OmeOmn
- OmnOn
- ONOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOOc
- OodOpa
- OpaOpe
- OpeOpp
- OppOr
- OrOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOrx
- OryOsb
- OsbOse
- OseOsm
- OsmOst
- OSTOte
- OteOto
- OtoOtt
- OttOua
- OuaOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOVX
- OvyOwe
- OweOxi
- OxiOza
- OzaOzo
- OzoOZZ
- Orlando Pops Orchestra, Lane, Andrew
- Orlando Riva Sound
- Orlando Vera Cruz
- Orlando, Bobby (US record producer, indie record label owner, songwriter & musician)
- Orlando, Courtney (singer-songwriter, FKA J.R.)
- Orlando, Johnny (Canadian singer-songwriter, vlogger and actor)
- Orlando, Johnny (reggae artist)
- Orlando, Johnny & BENEE
- Orlando, Johnny & DVBBS
- Orlando, Johnny & kenzie
- Orlando, Mike
- Orlando, Ramón
- Orlando, Rui
- Orlando, Tom (artist from Ottawa, Ontario, Canada)
- Orlando, Tony
- Orlando, Tony & Dawn (1970s pop group)
- Orlando, Tony & Dawn Featuring Orlando, Tony
- Orlando, Tony And Orlando, Tony & Dawn
- Orlane (French zouk singer)
- Orlane (Belgian singer)
- Orleans
- Orleans, Joan
- Orlek
- Orleya
- Orlić, Tiho (Croatian pop-rock music singer-songwriter, music producer)
- Orlik (czech Oi!)
- Orliński, Jakub Józef, Biel, Michal
- Orlinski, Richard & Simons, Eva
- Orloff, Peter (schlager-singer, songwriter, producer, actor)
- Orloge Simard
- Orlons, The (US R&B group)
- Orlova, Alina
- Orlowski, Kris
- Orlowsky, David (German clarinetist)
- Orlowsky, David, Trio
- Orly (cuarteto group)
- ORM (epic/melodic black metal band from Denmark)
- Ormabol (Norwegian folk/black metal band)
- Ormai
- Ormandy, Eugene (conductor)
- Ormandy, Eugene & Philadelphia Orchestra, The
- Ormåsen, Gaute
- Ormaz (French rapper)
- Orme, Le
- Ormiston
- Ormonde
- Ormsby Brothers, The
- ORMUS (Spanish DJ)
- ormus (Trance/Progressive producer)
- Orna
- Ornament (Afghan Whigs and Marcy Mays)
- Ornamento y Delito
- Ornaments (Italian band)
- Ornate
- Ornate feat. Jack the Underdog
- Ornatos Violeta
- Orne
- Ornelas, Raúl
- Ornella Napolitani
- Ornella Thiry
- Ornery (Folk punk band from Vancouver, BC, Canada)
- Ornette (French‐Italian singer‐songwriter multi‐instrumentalist)
- Ornithology (Performance name of Shaan Chhadva)
- Ornob
- ORO (Uruguay)
- Oro Negro (Grupo de Ecuador)
- Oro Sólido
- Oro Swimming Hour
- Oro y Plata, Dueto
- Orobians, The
- Orochen (Post-rock / folk from Sweden)
- Orochi (Brazilian rapper)
- Orodruin (Traditional Doom Metal band from U.S.A.)
- Orofino, Richard
- Orok, Shayne
- Orok, Shayne & Orok, Ali
- Öröm
- Oromocto Diamond
- Oronti
- Oropesa, Omar (Christian music singer)
- Ôros Kaù (Belgian black metal)
- Orouni
- Oroza, Bobby
- Oroza, Bobby & El Michels Affair
- Oroza, Bobby feat. Cold Diamond & Mink
- Orozco Barrientos
- Orozco, Alejandra
- Orozco, Antonio (Spanish singer-songwriter)
- Orozco, Antonio & Fonsi, Luis
- Orozco, Antonio & Juanes
