- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- oblObs
- ObsOce
- OceOch
- OchOCT
- OctODC
- ODCOdd
- OddOde
- OdeODU
- ODUof
- ofOFF
- OffOFK
- OfMOgr
- OgrOh
- OhOhi
- OhiOim
- OimOK
- OKOke
- OkeOl
- OlOl
- OlaOld
- OldOle
- OleOlg
- OlgOli
- OliOli
- OliOls
- OlsOma
- OmaOma
- OmaOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneOnk
- OnkOno
- OnoOny
- OnyOos
- OosOpe
- OpeOPL
- OPMOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriORK
- OrkOro
- OroOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOSK
- OskOss
- OssOta
- OtaOth
- OthOtt
- OttOtt
- OttOur
- OurOut
- OutOut
- OutOut
- OutOv
- OvOve
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOza
- OzaOzo
- OzoOzz
- Original Oktoberfest Band
- Original Pistols, The
- Original Rap Staff
- Original Rudeboys, The
- Original Salty Dogs, The
- Original Sharks (Brooklyn Melodic Punk)
- Original Sin (UK drum and bass)
- Original Sins, The
- Original Sonora Dinamita de Lucho Argaín y Xiu García, La
- Original Südtiroler Spitzbuam
- Original Surfaris, The
- Original Swimming Party
- Original Television Cast of Hairspray LIVE!
- Original Texas Playboys, The (regrouped 20th centry Texas Playboys)
- Original TV Studio
- Original Virgins, The
- Original Zillertaler (Folk, Pop)
- Original, The (1990s NYC‐based house group)
- originalDoku
- Originale, Die
- Originale, Ragz
- Originale, Ragz feat. 24hoursav & Saleh, Dua
- Originale, Ragz feat. Bakar
- Originale, Ragz feat. Glacier, John
- Originale, Ragz feat. Knucks
- Originale, Ragz feat. LOLA
- Originale, Ragz feat. Sampha
- Originale, Ragz feat. Tiana Major9 & Venna
- Originales de San Juan, Los
- Originální pražský synkopický orchestr
- Originals
- Originals (Progressive psychedelic trance duo project from Israel)
- Originals Cast of 'Paddington The Musical', The
- Originals, The (Motown group)
- Originals, The (Brazilian group)
- Origo (Epidemic Sound)
- Orihusay
- Orikasa, Ai
- Orikasa, Fumiko
- Orina (Punk-rock band from Málaga, Spain)
- Orinegro Tropical (Salsa)
- ORIO (hololive vtuber duo)
- Oriol, Christiane (French singer & songwriter)
- Orioles, The
- Orion (goa trance artist Jean Borelli)
- Orion (Symphonic Prog Group from France)
- Orion (Cybernetic Noir)
- Orion (Techno producer Juska Wendland)
- ORION 224
- Orion 8
- Orion and the Melted Crayons
- Orion Child (Spanish metal band)
- Orion Experience, The
- Orion Riders
- Orion Rigel Dommisse
- Orion Sun
- Orion Too (Belgian 2000s trance project)
- Orion Too feat. Caitlin
- Orión XL (Argentine Rapper)
- orion, artemis & mayari.
- Orion, DJ (Electro/Cumbia)
- Orion, Eli
- Orion, Hailey
- 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. Buenaventura, Yuri
- Orishas feat. Passi
- Orisma
- Orison (Dalibor Delić & Nikola Kozić)
- 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)
