• Oo Wee Baby, I Love You - Fred Hughes
• Ooby Dooby - Roy Orbison
• The Oogum Boogum Song - Brenton Wood
• Ooh Aah... Just A Little Bit - Gina G
• Ooh Baby - Gilbert O'Sullivan
• Ooh Baby Baby - The Miracles
• Ooh Baby Baby - Linda Ronstadt
• Ooh Ooh Song - Pat Benatar
• Ooh! My Soul - Little Richard
• Oop-Shoop - The Crew-Cuts
• Open Arms - Journey
• Open the Door to Your Heart - Darrell Banks
• Open the Door, Richard - Count Basie
• Open the Door, Richard - Charioteers
• Open the Door, Richard - Dusty Fletcher
• Open the Door, Richard - Louis Jordan
• Open the Door, Richard - Jack McVea
• Open the Door, Richard - The Pied Pipers
• Open the Door, Richard - The Three Flames
• Open Up Your Heart (and Let the Sunshine In) - The Cowboy Church Sunday School
• Open Your Heart - Madonna
• Operator - The Manhattan Transfer
• Operator - Midnight Star
• Operator (That's Not the Way it Feels) - Jim Croce
• Opportunities (Let's Make Lots of Money) - Pet Shop Boys
• Opposites Attract - Paula Abdul (with the Wild Pair)
• Opus 17 (Don't You Worry 'Bout Me) - The 4 Seasons
• Orange Blosom Lane - Glenn Miller
• Orange Colored Sky - Nat King Cole
• Orchids In the Moonlight - Enric Madriguera
• Orchids In the Moonlight - Rudy Vallee
• Ordinary World - Duran Duran
• Organ Grinder's Swing - Benny Goodman
• Organ Grinder's Swing - Hudson-DeLange Orchestra
• Organ Grinder's Swing - Jimmy Lunceford
• Organ Grinder's Swing - Tempo King
• Orinoco Flow (Sail Away) - Enya
• Orly - The Guess Who