- O Brother Where Art Thou?
- O Jackie
- O M D
- O Rappa
- O Surto
- O'Jays
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- O-Town
- O-v-s-a
- O-Zone
- O.A.R.
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- O.C.
- O.G. Spanish Fly
- O.G. Style
- O.G.C. (Originoo Gunn Clappaz)
- O.L.D.
- O.R.O. (Onde Radio Ovest)
- O?Death
- Oag
- Oai Star
- Oak Ridge Boys
- Oak Ridge Boys, The
- Oakey Philip And Moroder Giorgio
- Oar
- Oasis
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- Obituary
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- Obscene Eulogy
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- Obsessed (the)
- Obsession Indecent
- Obsidian Gate
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- Oc Supertones
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- Occult
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- Ocean 11
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- Ocean Colour Scene
- Ocean Eleven
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- Oceana
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- Oceanlab
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- Odd And Idle
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- Odd Nordstoga
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- Odds
- Oddzial Zamkniety
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- Odetta
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- Odious
- Odious Sanction
- Odium
- Odorants
- Odyssey
- Of A Revolution
- Of Mice & Men
- Of Monsters
- Of Monsters and Men
- Of Montreal
- Of Sound And Fury
- Of The Son
- Of The Wand And The Moon
- Ofermod
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- Off By One
- Off Minor
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- Off Topic
- Off We Go Again
- Offbeatz
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- Office of Strategic Influence (O.S.I.)
- Officer Negative
- Official Kardinal
- Officinalchemike
- Officium Triste
- Offlaga Disco Pax
- Offset
- Offspring
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- Ogie Alcasid
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- Ogres De Barback
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- Ohio Players
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- Olivija
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- Olli Schulz Und Der Hund Marie
- Olly Murs
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- Olsen Brothers
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- Omc
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- Once
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- Onda Vaselina
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- One-21
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- Onesidezero
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- Or Just Not
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- Ordinance
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- Ordo Draconis
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- Original Cast Recording
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- Originales De San Juan, Los
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- Orion
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- OST
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- Ostara
- Ostbahn Kurt
- Ostbahn-Kurti Und Die Chefpartie
- Ostkyst Hustlers
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- Outlandish
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- OV7
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- Over It
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- Ozaki Yutaka
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- Ozielzinho
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- Ozric Tentacles
- Ozzy Osbourne
- Ozzy's Angels
