| Song/Tune Title | Book |
| O Love, 'Tis A Calming Starry Night | CFB |
| O Love, How Deep, How Broad, How High | HFB |
| O Master, Let Me Walk With Thee | HFB |
| O Mio Babbino Caro | MFB |
| O Morning Star,How Fair & Bright composed by Philipp Nicolai | CFB2 |
| O Morro Nao Tem Vez (Favela) (Somewhere In The Hills) | HLRJFB |
| O My Dearest Augustine | FFB |
| O My Soul, Bless Thou Jehovah | HFB |
| O No, John! | FFB |
| O Pato (The Duck) | LRB |
| O Perfect Love | HFB |
| O Promise Me composed by Reginald de Koven | CFB2 |
| O Rest In The Lord composed by Felix Mendelssohn | CFB2 |
| O Sacred Head, Now Wounded | HFB |
| O Sacred Head, Now Wounded composed by Hans Leo Hassler | CFB2 |