- O Mistress Mine by Beach, Amy Marcy
- O Mistress Mine by Vaughan Williams, Ralph
- O Mistress Mine by Vaughan Williams, Ralph
- O mistress mine by Bachlund, Gary
- O Mistress Mine by Parry, Charles Hubert Hastings
- O Mistress Mine by Korngold, Erich Wolfgang
- O mistress mine by Baxter, Garth
- O Mistress Mine, Where Are You Roaming by Shakespeare, William
- O My Deir Hert by Howells, Herbert Norman
- O My Deir Hert by Thomson, Virgil
- O My Deir Hert, Young Jesus Sweit by Wedderburn, James
- O Peace, the Fairest Child of Heaven by Thompson, James
- O Peace, the Fairest Child of Heaven by Arne, Thomas Augustine
- O Praise the Lord by Greene, Maurice
- O Praise the Lord by Anonymous Biblical Texts
- O Rest in the Lord by Bartholomew, William
- O Rest in the Lord by Mendelssohn, Felix
- O Saviour, Hear Me by Buck, Dudley
- O Saviour, Hear Me! by Buck, Dudley
- O Saviour, Hear Me! by Gluck, Christoph Willibald
- O Take Those Lips Away by Maconchy, Elizabeth
- O Thou That Tellest Good Tidings to Zion by Händel, Georg Friedrich
- O Thou That Tellest Good Tidings to Zion by Jennens, Charles
- O Tuneful Voice by Hunter, Anne
- O Tuneful Voice by Haydn, Franz Joseph
- O Waly, Waly by Dougherty, Celius
- O Waly, Waly by Britten, Benjamin
- O Waly, Waly by Anonymous English Poets
- O You Whom I Often and Silently Come by Whitman, Walt
- O You Whom I Often and Silently Come by Rorem, Ned
- O, Sabbath Rest of Galilee by Whittier, John Greenleaf
- O, Sabbath Rest of Galilee by Stevens, Halsey
- O’er the Hills far away by Hopkinson, Francis
- O’er the Hills far away by Hopkinson, Francis
- Oh Fair Enough Are Sky and Plain by Housman, Alfred Edward
- Oh Fair Enough Are Sky and Plain by Baksa, Robert F.
- Oh Fair Enough Are Sky and Plain by Moeran, Ernest John
- Oh Fair Enough Are Sky and Plain by Butterworth, George
- Oh Fair Enough Are Sky and Plain by Orr, Charles Wilfred
- Oh Sleep, Why Dost Thou Leave Me by Händel, Georg Friedrich
- Oh Sleep, Why Dost Thou Leave Me by Congreve, William
- Oh, Gentlemen, Listen, I Pray by Gilbert, William Schwenck
- Oh, Gentlemen, Listen, I Pray by Sullivan, Sir Arthur
- Oh, Had I Jubal’s Lyre by Morell, Thomas
- Oh, Had I Jubal’s Lyre by Händel, Georg Friedrich
- Oh, the Pretty, Pretty Creature by Anonymous English Poets
- Oh, When I Was in Love with You by Housman, Alfred Edward
- Oh, When I Was in Love with You by Baksa, Robert F.
- Oh, When I Was in Love with You by Vaughan Williams, Ralph
- Ol’ Jim by Brakle, John van
- Ol’ Jim by Edwards, Clara
- On Richmond Hill There Lives a Lass by Hook, James
- On Richmond Hill There Lives a Lass by Anonymous English Poets
- On the Idle Hill of Summer by Housman, Alfred Edward
- On the Idle Hill of Summer by Somervell, Sir Arthur
- On the Idle Hill of Summer by Butterworth, George
- On the Idle Hill of Summer by Gurney, Ivor
- On the Road to Mandalay by Hedgcock, Walter
- On the road to Mandalay by Speaks, Oley
- On Wenlock Edge by Gurney, Ivor
- On Wenlock Edge by Vaughan Williams, Ralph
- On Wenlock Edge by Housman, Alfred Edward
- Once I Loved a Maiden Fair by Anonymous English Poets
- Once I loved a maiden fair by Parker, Horatio William
- Orpheus by Blitzstein, Marc
- Orpheus by Pasatieri, Thomas
- Orpheus by Gurney, Ivor
- Orpheus by Castelnuovo-Tedesco, Mario
- Orpheus with His Lute by Bunge, Sas
- Orpheus with His Lute by Schuman, William Howard
- Orpheus with His Lute by Greene, Maurice
- Orpheus with His Lute by Sullivan, Sir Arthur
- Orpheus with His Lute by Gardner, John Linton
- Orpheus with His Lute by Quilter, Roger
- Orpheus with His Lute by German, Edward
- Orpheus with His Lute by Vaughan Williams, Ralph
- Orpheus with His Lute Made Trees by Shakespeare, William
- Orsames’ Song by Suckling, Sir John
- Orsames’ Song by Parker, Horatio William
- Out of the night by Korbay, Francis Alexander
- Over the Land Is April by Stevenson, Robert Louis
- Over the Land Is April by Charles, Ernest
- Over the Land Is April by Quilter, Roger
- Phillis Has Such Charming Graces by Young, Anthony
- Phillis Has Such Charming Graces by Wilson, Henry Lane
- Phillis Has Such Charming Graces by Anonymous English Poets
- Piercing Eyes by Anonymous English Poets
- Piercing Eyes by Haydn, Franz Joseph
- Piggésnie by Warlock, Peter
- Piggésnie by Anonymous English Poets
- Pippa Passes by Bantock, Granville Ransome
- Pippa’s Song by Rorem, Ned
- Pleasing Pain by Haydn, Franz Joseph
- Pleasing Pain by Hunter, Anne
- Pleasure-Pain by Howells, William Dean
- Pleasure-Pain by Kjerulf, Halfdan
- Pleasure’s Gentle Zephyrs Playing by Morell, Thomas
- Pleasure’s Gentle Zephyrs Playing by Händel, Georg Friedrich
- Polly Willis by Anonymous English Poets
- Polly Willis by Arne, Thomas Augustine
