O Master, Let Me Walk With Thee (5-747)
O Mistress Mine (1-716)
O Morn of Beauty (2-839)
O Music (4-638)
O Nata Lux, Light Born of Light (5-926)
O Night Divine (3-625)
O Night of Nights (5-351)
O No, John (0-413)
O Praise Ye the Lord (3-491)
O Sacred Feast (5-565)
O Sacred Head, Now Wounded (5-966)
O sacrum convivium (5-461)
O Saviour, Prescious Saviour (6-155)
O Shining Star (5-861)
O Sing to the Child (2-986)
O Sing to the Lord (3-629)
O Sing Unto the Lord (4-731)
O Sinner Man (0-499)
O Sleep Thou Heavenborn Treasure (1-625)
O sons and daughters (5-439)
O Sons and Daughters, Let Us Sing (1-793)
O Spirit Divine, Attend Our Prayers (0-753)
O Swallow, Swallow (4-519)
O Taste and See (1-232)
