O letters - Artist List - 221 Artist
- O'Connor, Sinead
- O'Day, Aubrey
- O'Donis, Colby
- O'Jays, The
- O'Neal, Jamie
- O'Neil, Melissa
- O'Riordan, Dolores
- O'Ryan
- O'Shaughnessy, Ryan
- O'Sullivan, Gilbert
- O-Town
- O-Zone
- O.A.R. (Of A Revolution)
- O.C. Dawgs
- O.S.T.R.
- O.T. Genasis
- Oak Ridge Boys, The
- Oak, Winona
- Oakenfold, Paul
- Oakes, Ryan
- Oasis
- OB O'Brien
- Obel, Agnes
- Oberst, Conor
- Obey The Brave
- Obie Trice
- Obituary
- OBLADAET
- OBN Jay
- Ocean Alley
- Ocean Colour Scene
- Ocean Grove
- Ocean Park Standoff
- Ocean Wisdom
- Ocean, Billy
- Ocean, Frank
- Oceana
- Oceanlab
- Oceano
- Oceans
- Oceans Ate Alaska
- Oceans Divide
- Ochs, Phil
- Octavian
- October Fall
- Odd Future Wolf Gang Kill Them All (OFWGKTA)
- Odell, Tom
- Odessa
- ODESZA
- Odette
- Odezenne
- ODIE
- Oerding, Johannes
- Of Mice & Men
- Of Monsters And Men
- Of Montreal
- Of Virtue
- OFB
- Ofenbach
- Off Bloom
- Off With Their Heads
- OFFAIAH
- Offica
- OFFMi
- Offset
- Offspring, The
- OG 3Three
- OG Buda
- OG Keemo
- OG Maco
- Ogawa, Jakob
- Ogie Alcasid
- Ogilvie, George
- Oğuzhan Koç
- Oh Hayoung
- Oh Hellos, The
- Oh Honey
- Oh Land
- Oh My Girl
- Oh Sees
- Oh Wonder
- Oh, Sleeper
- Oh, Weatherly
- Ohio Players
- Oingo Boingo
- OJ Da Juiceman
- OK Go
- OK KID
- Okkervil River
- Ol' Dirty Bastard
- Oladipo, Victor
- Olamide
- Old 97's
- Old Crow Medicine Show
- Old Dominion
- Old Sea Brigade
- Oldfield, Mike
- Oleander
- Oleta Adams
- Olexesh
- Oliver Francis
- Oliver Heldens
- Oliver Riot
- Oliver Tree
- Olivia
- Olivia Holt
- Olivia Newton-John
- Olivia O'Brien
- Olivia Rodrigo
- Olivver The Kid
- Ollie
- Ollie MN
- Olly Murs
- Olsen, Angel
- Olsen, Steven Lee
- Olstead, Renee
- Olympia
- Olzanski, Sebastian
- Omar Apollo
- Omar, Xavier
- Omarion
- OMB Peezy
- OMC
- OMG Girlz
- OMI
- One Acen
- One Chance
- One Day As A Lion
- One Direction
- One Less Reason
- One Night Only
- ONE OK ROCK
- One Sonic Society
- One True Voice
- One Voice
- ONEFOUR
- OneRepublic
- ONEUS
- Onew
- Ong Seong Wu
- Ong, Daryl
- Only The Young
- Onyx
- Onze:20
- Ookay
- Oomph!
- Open Mike Eagle
- Operation Ivy
- Opeth
- OPM
- Or3o
- Ora, Rita
- Orange & Lemons
- Orange Goblin
- Oraventus
- Orbison, Roy
- Orchestral Manoeuvres In The Dark
- Ordinary Boys, The
- Oreiro, Natalia
- Orelsan
- Orgy
- Orhan, Mahmut
- Orianthi
- Origin
- Orla Gartland
- Orlando, Johnny
- Orleans
- Orphaned Land
- Orrico, Stacie
- Orson
- Ortega, Jeannie
- Ortega, Via
- Ortiz, Gerardo
- Ortiz, Joell
- Orton, Beth
- Orville Peck
- Orwells, The
- Osborne, Jeffrey
- Osborne, Joan
- Osbourne, Kelly
- Oscar And The Wolf
- Oscar, Alexander
- Osíris, Conan
- Osmani Garcia
- Osment, Emily
- Osmond, Donny
- Osmond, Marie
- Otep
- Other Lives
- Otherwise
- Otilia
- Otis Redding
- Otsochodzi
- Otto Knows
- Otto, James
- Our Hollow, Our Home
- Our Lady Peace
- Our Last Night
- Our Mirage
- Ours
- Out Came The Wolves
- Outasight
- Outfield, The
- Outkast
- Outlandish
- Outlaws
- Over October
- Overkill
- Overstreet, Chord
- Overtones, The
- Owen, Jake
- Owen, Mark
- Owens, Buck
- Owens, Tatiana
- Owl City
- Oxide & Neutrino
- Oxxxymiron
- Ozan Doğulu
- Ozma
- Ozuna
- Ozzy Osbourne