- Octopus -uk-
- Octopus Project
- Octopus Ride
- Octopus Syng
- Od Bongo
- Odawas
- Odcult
- Odd
- Odd Beholder
- Odd Clouds
- Odd Couple
- Odd Hope
- Odd Man Out
- Odd Nordstoga
- Odd Nosdam
- Odd Numbers
- Odd Rumblings
- Oddarrang
- Oddateee
- Oddball'S Band
- Oddballs
- Oddgeier Berg Trio
- Oddgeir -trio- Berg
- Oddisee
- Oddisee&Good Compny
- Oddzial Zamkniety
- Oddzoo
- Ode-omore Osarenren&Ew
- Odeko
- Odell Brown
- Odeon
- Odessey&Oracle
- Odesza
- Odetta
- Odetta Hartman
- Odette
- Odeville
- Odezenne
- Odin
- Odio
- Odion Iruoje
- Odious Construct
- Odium
- Odonis Odonis
- Odyssey
- Odyssey 5
- Odyssey Cult
- Of Feather And Bone
- Of Mice And Men
- Of Mice&Men
- Of Monsters And Men
- Of Montreal
- Of Sinking Ships
- Of The Horizon
- Of The Valley
- Of The Wand And The Moon
- Ofege
- Ofei
- Ofeliadorme
- Ofenbach
- Ofermod
- Off
- Off Love
- Off The Grid
- Off The Meds
- Off With Their Heads
- Off World
- Off!
- Offa Rex
- Offenders
- Offensive Weapon
- Offhooks
- Office Of Future Plans
- Officer
- Official Secrets Act
- Officina Meccanica
- Offshore
- Offspring
- Offwhyte
- Ofo The Rock Company
- Ofrin
- Og Musique
- Oghene Kologbo&World S
- Ogi
- Ogikubo Station
- Ogon Batto
- Ogoya Nengo&The Dodo W
- Ogre
- Ogres De Barback
- Ogris Debris
- Oh Boland
- Oh Gunquit
- Oh Land
- Oh Mercy
- Oh No
- Oh Pep!
- Oh Sees
- Oh Weatherly
- Oh Wonder
- Ohal
- Ohama
- Ohashi Yuko
- Ohbliv
- Ohgr
- Ohhms
- Ohio Defiance
- Ohio Penitentiary 511 Jaz
- Ohio Players
- Ohioan
- Ohl
- Ohmega Watts
- Ohmega Whatts
- Ohmme
- Ohmslice
- Ohrbooten
- Ohrenfeindt
- Ohtis
- Ohuzaru
- Ohyda
- Oi Polloi
- Oi Polloi/Tokik Ephex
- Oi Tanking
- Oi Va Voi
- Oi!Dium
- Oil
- Oiling Boiling
- Oiltanker/No Tomorrow
- Oingo Boingo
- Oiro
- Oiseaux-Tempete
- Oister
- Oiters
- Oizone
- Ojerum
- Ojm
- Ojo Por Ojo
- Ok
- Ok Jazz/Ko Jazz
- Ok Vancouver Ok
- Ok:ko
- Okapi
- Okapi&Aldo Kapi's Orche
- Okawa&The Rulers
- Okay Champ
- Okay Kaya
- Okay Temiz
- Okay Temiz/Johnny Dyani
- Okee Dokee Brothers
- Oker
- Okey Dokey