"O" Titles
- O Bienheureuse Nuit
- O Charlie Is My Darling
- O Christmas Tree
- O Come All Ye Faithful
- O Come, Come Away
- O Come, Little Children
- O Dear! What Can the Matter Be?
- O Fair Dove! O Fond Dove!
- O Give Me a Home by the Sea
- O Holy Night
- O Little Town of Bethlehem
- O Lovely Day, O Happy Day!
- O Music
- O Paradise
- O Sanctissima
- O Weary Feet
- O Zion, That Bringest Good Tidings
- Obstination
- Oft in the Stilly Night
- Oh! Don't You Remember Sweet Alice
- Oh, Hush Thee, My Baby
- Oh! Susanna
- Oh! Willie, We Have Missed You
- Old Arm Chair, The
- Old Black Joe
- Old Cabin Home, The
- Old Dan Tucker
- Old Folks at Home, The
- Old Hundred
- Old Oaken Bucket, The
- Old Rosin, The Beau
- Old Sexton, The
- Old Shady
- On Venice Waters
- Once in Royal David's City
- One Sweetly Solemn Thought
- Only a Face at the Window
- Only to See Thee
- Onward, Christian Soldiers
- Orphan Boys, The
- Our Baby
- Our Native Song
- Over the Garden Wall