- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOCE
- OceOct
- octOdd
- OddOdi
- OdiOf
- OfOff
- OffOh
- ohohG
- OhgOji
- OJMokh
- OKIOla
- OlOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnOnb
- OncOne
- OneOne
- OneOni
- ONJont
- OntOos
- OotOph
- OphOR
- OrOrb
- OrbOrc
- OrcORE
- OreOri
- OriOrl
- OrlOrp
- OrpOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOye
- Ozy
- OzzOZZ
- Original Caste, The (folk group)
- Original Charlie Parker Quintet
- Original Concept
- Original de Manzanillo, la
- Original Deutschmacher, Die
- Original Dixieland Jazz Band
- Original Flavor ('90s US rap group)
- Original God
- Original God & LIL NARNIA
- Original Gros Bonnet
- Original Lead Singers of The Temptations, The
- Original London Cast
- Original London Cast of Girl From The north Country
- Original London Cast of Miss Saigon
- Original London Cast of Sister Act
- ORIGINAL LOVE
- Original Mirrors
- Original Motion Picture Soundtrack
- Original Naabtal Duo
- Original Pistols, The
- Original Rap Staff
- Original Rudeboys, The
- Original Sin (UK drum and bass)
- Original Südtiroler Spitzbuam
- Original Swimming Party
- Original Television Cast of Hairspray LIVE!
- Original TV Studio
- Original Uman
- Original Zillertaler (Folk, Pop)
- Original, The (electronic/house group)
- Originale, Die
- Originale, Ragz
- Originale, Ragz feat. Glacier, John
- Originales de San Juan, Los
- Originals, The (Motown group)
- Originals, The (Brazilian group)
- Originoo Gunn Clappaz
- 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
- Orionix
- Orions Belte (Norwegian instrumental band)
- Orions Belte feat. Aase, Sigrid
- Orions Belte feat. Lerche, Sondre
- 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)
- 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
- 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