| Song/Tune Title | Book |
| One, Two, Buckle My Shoe C Major | LCSC |
| One, Two, Three, Four, Five F Major | LCSC |
| One-horned oow | ON1001 |
| One-Horned Sheep, The | TTSBV1 |
| Onion Tops and Turnip Greens | PHILVII |
| Only One Step More | BORF |
| ONLY TRUST HIM | GIS |
| Onward Christian Soldiers | FSWB |
| ONWARD, CHRISTIAN SOLDIERS | GIS |
| Onward, Upward Eb Major | LCSC |
| Ook-Pik Waltz | TTSVII |
| Ookpik Waltz | PHILVII |
| Open arms (75) | TPWM |
| Open the door for three 449 | ON1001 |
| Open the Door to Three | TTSBV1 |