• O C Smith
• O Jays, The
• O Town
• O Yeah
• O'Kaysions, The
• O-Town
• Oak Ridge Boys, The
• OAR
• Oasis
• OC Smith
• Ocean
• Ocean Colour Scene
• Oceanic
• Odyssey
• Offspring, The
• Ohio Express
• Ohio Players, The
• Oingo Boingo
• OK Go
• Oleander
• Oleta Adams
• Oliver
• Oliver Cheatam
• Olivia
• Olivia Newton-John
• Olivia Newton-John & ELO
• Olivia Newton-John & John Travolta
• Ollie & Jerry
• Olly Murs
• Olympics
• Omarion
• OMD
• One Block Radius
• One Direction
• One True Voice
• One Way Ride
• OneRepublic
• Operator Please
• OPM
• Oran 'Juice' Jones
• Orange Juice
• Ordinary Boys
• Ordinary Boys & Lady Sovereign
• Orgy
• Orleans
• Orson
• Osborne Brothers, The
• Osborne Brothers, The & Red Allen
• Oscar The Grouch
• Osmond Brothers
• Osmonds, The
• Otis Day & The Knights
• Otis Redding
• Ottawan
• Our Lady Peace
• Out Of The Gray
• Outfield
• Outhere Brothers
• Outkast
• Outlaws, The
• Outsiders, The
• Outspoken
• Overlanders
• Owen Paul
• Owl City
• Oxo
• Ozark Mountain Daredevils
• Ozzy Osbourne
• Ozzy Osbourne & Kelly Osbourne
• Ozzy Osbourne & Lita Ford