| Title | Artist | Song # |
| O For A Thousand Tongues To Sing | Gospel | 154-7 |
| O For A Thousand Tongues To Sing | Traditional | 050-11 |
| O Holy Night | Christmas | 099-13 |
| O How I Love Jesus | Traditional | 097-14 |
| Ocean Avenue | Yellowcard | 092-10 |
| Ocean Floor | Audio Adrenaline | 171-4 |
| Ocean Front Property | Strait, George | 016-5 |
| Oh Girl | Chi-Lites, The | 019-13 |
| Oh Happy Day | Traditional | 100-7 |
| Oh How I Love Jesus | Standard | 135-4 |
| Oh Lord Stand By Me | Smallwood, Richard | 160-10 |
| Oh What A Night | Dells, The | 106-15 |
| Oh What A Night (December 1963) | Valli, Frankie | 165-3 |
| Oh, Pretty Woman | Orbison, Roy | 156-2 |
| Okie From Muskogee | Haggard, Merle | 132-7 |
| Ol' Red | Shelton, Blake | 036-4 |
| Old Dogs, Children And Watermelon Wine | Hall, Tom T. | 125-6 |
| Old Fashioned Love Song | Three Dog Night | 044-14 |
| Old Friend | Hyman, Phyllis | 078-12 |
| Old Rugged Cross, The | Standard | 135-1 |
| Old Rugged Cross, The | Traditional | 100-11 |
| Old Time Rock 'n' Roll | Seger, Bob | 095-8 |
| On My Cross | FFH | 056-12 |
| On My Knees | Velasquez, Jaci | 122-1 |
| On My Knees | Velasquez, Jaci | 133-1 |
| On My Knees | Velasquez, Jaci | 057-3 |
| On The Other Side Of The Radio | Rice, Chris | 051-7 |
| On The Road Again | Nelson, Willie | 068-3 |
| On The Road Again | Nelson, Willie | 095-9 |
| On The Verge | Raye, Collin | 062-16 |
| On The Way Down | Cabrera, Ryan | 092-14 |
| On Top Of Old Smokey | Standard | 004-11 |
| Once You've Loved Somebody | Dixie Chicks | 019-14 |
| One | U2 | 146-3 |
| One | U2 | 023-9 |
| One Day Left To Live | Kershaw, Sammy | 142-6 |
| One For My Baby | Sinatra, Frank | 169-13 |
| One Has My Name, One Has My Heart | Reeves, Jim | 131-13 |
| One More Night | Collins, Phil | 112-15 |
| One Of These Days | FFH | 058-1 |
| One Of These Nights | Eagles, The | 167-8 |
| One Of Us | Osborne, Joan | 019-15 |
| One On One | Hall & Oates | 070-4 |
| One You Love, The | Frey, Glen | 169-3 |
| One, The | Allan, Gary | 021-7 |
| Only Fools | Lewis, Crystal | 090-11 |
| Only Grace | West, Matthew | 170-3 |
| Only Hope | Switchfoot | 157-3 |
| Only One Road | Dion, Celine | 001-5 |
| Only Time | Enya | 168-6 |
| Only You | Platters, The | 069-16 |
| Only You Know & I Know | Clapton, Eric | 030-12 |
| Onward Christian Soldiers | Traditional | 097-2 |
| Onward, Christian Soldiers | Gospel | 154-8 |
| Open Our Eyes | Praise & Worship | 087-6 |
| Open The Eyes Of My Heart Lord | Praise & Worship | 085-3 |
| Our Day Will Come | Ruby & The Romantics | 104-5 |
| Outside | Staind | 075-8 |
| Outside Woman Blues | Clapton, Eric | 030-2 |
| Over My Head (Cable Car) | Fray, The | 171-6 |
| Over The Rainbow | Garland, Judy | 164-16 |
| Overkill | Men At Work | 077-12 |