- 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
- OttOty
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxa
- OxbOZ
- Oz
- ozz
- Orion, Haley
- Orion's Beethoven
- Orion’s Reign
- Orion’s Reign feat. Minniva
- Orionix
- Orions Belte (Norwegian instrumental band)
- Orions Belte feat. Aase, Sigrid
- Orions Belte feat. Lerche, Sondre
- Orisaka, Yūta
- Orisha
- Orishas (Cuban hip hop group)
- Orishas feat. Ballende, Passi
- Orishas feat. Buenaventura, Yuri
- Orishas feat. Niko Noki
- Orito, Shinji
- Orizzon (Modern Metal Band)
- Orjan (trance producer)
- Orka (Band from Faroe Islands)
- Orkan (Swedish prog rock)
- Orkest
- Orkest Zonder Naam
- Orkesta Mendoza (Indie Mambo)
- Orkestar Business Class (Finnish band)
- Orkesterpop
- OrKestra (incl. Ex-Members of ELO)
- Orkhan Efendi
- ORKID (Swedish singer)
- Orkidea (Finnish DJ / producer Tapio Hakanen)
- Orkiestra Dni Naszych
- Orkiestra św. Mikołaja (The Saint Nicholas Orchestra)
- Orkiestra Symfoniczna Filharmonii Narodowej, Rowicki, Witold
- Orkiestra Uliczna Z Chmielnej
- Orko (UK rock band)
- Orko the Sycotik Alien
- Orkrist
- Orlandi, Violet
- Orlandi, Violet feat. Dan Vasc
- Orlandi, Violet feat. First to Eleven & Halocene
- Orlandi, Violet, Babic, Lauren, Halocene & First to Eleven
- Orlando (English Romo band)
- Orlando (Belgian tech house singer)
- Orlando (Italian Italodance project from S.A.I.F.A.M. Group)
- Orlando (UK singer songwriter)
- Orlando Julius (Nigerian saxophonist, singer, bandleader, and songwriter)
- Orlando Marin & His Orchestra
- Orlando Philharmonic Orchestra
- Orlando Pops Orchestra
- 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!)
- 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
