- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- Origo (Epidemic Sound)
- Orihusay
- Orikasa, Fumiko
- Orinegro Tropical (Salsa)
- ORIO (hololive vtuber duo)
- Oriol, Christiane (French singer & songwriter)
- Orioles, The
- Orion (Symphonic Prog Group from France)
- Orion (Cybernetic Noir)
- ORION 224
- Orion 8
- Orion and the Melted Crayons
- Orion Experience, The
- Orion Riders
- orion sun
- Orion the Hunter
- Orion Too (Belgian 2000s trance project)
- Orion Too feat. Caitlin
- Orión XL (Argentine Rapper)
- Orion, DJ (Electro/Cumbia)
- Orion's Reign
- Orion's Reign feat. Minniva
- Orionix
- Orions Belte (Norwegian instrumental band)
- Orions Belte feat. Aase, Sigrid
- Orions Belte feat. Lerche, Sondre
- Orisha
- Orishas (Cuban hip hop group)
- Orishas feat. Buenaventura, Yuri
- Orishas feat. Niko Noki
- Orishas feat. Passi
- Orixa
- Orka
- Orkan (Swedish prog rock)
- Orkest
- Orkest Zonder Naam
- Orkesta Mendoza (Indie Mambo)
- Orkestar Business Class (Finnish band)
- Orkesterpop
- Orkhan Efendi
- ORKID (Swedish singer)
- Orkidea (Finnish DJ / producer Tapio Hakanen)
- Orkiestra Dni Naszych
- 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 (Belgian tech house singer)
- Orlando (Italian italo-dance project)
- 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 & kenzie
- Orlando, Ramón
- Orlando, Tom (artist from Ottawa, Ontario, Canada)
- Orlando, Tony
- Orlando, Tony & Dawn (1970s pop group)
- Orlane (French zouk singer)
- Orlane (Belgian singer)
- Orleans
- Orleya
- Orlić, Tiho (Croatian pop-rock music singer-songwriter, music producer)
- Orlik (czech Oi!)
- Orloff, Peter
- Orloge Simard
- Orlons, The (US R&B group)
- Orlova, Alina
- Orlowski, Kris
- Orlowsky, David
- Orlowsky, David, Trio
- ORM (epic/melodic black metal band from Denmark)
- Ormai
- Ormandy, Eugene (conductor)
- Ormandy, Eugene & Philadelphia Orchestra, The
- Ormåsen, Gaute
- Orme, Le
- Ormiston
