| 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 | 098-10 |
| O Holy Night | Christmas | 099-13 |
| O How I Love Jesus | Traditional | 097-14 |
| O-o-h Child | 5 Stairsteps, The | 226-15 |
| Ocean Floor | Audio Adrenaline | 171-4 |
| Oh Girl | Chi-Lites, The | 019-13 |
| Oh Happy Day | Traditional | 100-7 |
| Oh How I Love Jesus | Standard | 135-4 |
| Oh What A Night | Dells, The | 237-4 |
| Oh What A Night | Dells, The | 106-15 |
| Old Fashioned Love Song | Three Dog Night | 044-14 |
| Old MacDonald Had A Farm | Children | 041-2 |
| Old MacDonald Had A Farm | Children | 004-3 |
| Old Rugged Cross, The | Standard | 135-1 |
| Old Rugged Cross, The | Traditional | 100-11 |
| Old Time Rock 'n' Roll | Seger, Bob | 095-8 |
| Old Time Rock 'n' Roll | Seger, Bob | 201-16 |
| On Broadway | Benson, George | 237-1 |
| 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 Road Again | Nelson, Willie | 203-17 |
| On The Street Where You Live | Showtunes - My Fair Lady | 187-8 |
| On The Way Down | Cabrera, Ryan | 092-14 |
| On The Wings Of Love | Osborne, Jeffrey | 236-8 |
| One Day Left To Live | Kershaw, Sammy | 142-6 |
| One More Day | Diamond Rio | 212-5 |
| One More Night | Collins, Phil | 112-15 |
| One Of These Days | FFH | 058-1 |
| One Of These Days | FFH | 209-13 |
| One Summer Night | Danleers | 236-6 |
| One Sweet Day | Carey, Mariah & Boyz II Men | 237-12 |
| 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 | 039-5 |
| 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 |
| Operator | Manhattan Transfer | 235-14 |
| Orphans Of God | Avalon | 176-6 |
| Our Day Will Come | Ruby & The Romantics | 104-5 |
| Our House | Madness | 214-5 |
| Our Love | Cole, Natalie | 231-7 |
| Over My Head (Cable Car) | Fray, The | 171-6 |
| Over The Rainbow | Garland, Judy | 095-10 |
| Over The Rainbow | Garland, Judy | 164-16 |