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| O. B. C. | U | | As the sun doth daily rise | |
| O. B. C. | U | | As the sun doth daily rise | INNOCENTS |
| C. F. O. | U | | Lonely? no, not lonely While Jesus standeth by | |
| O. L. P. | | | The Savior calls for you today | |
| Frederick Oakeley | M | 1802 -- 1880 | In the Lord's atoning grief | |
| Herbert Stanley Oakeley | M | 1830 -- 1903 | Unless the Lord the house shall build | ABENDS |
| William Oakeley | M | | How condescending 'tis, that he | |
| E. W. Oakes | | | We'll sing the wondrous story | |
| Edward M. Oakes | M | | Faith in God's word is but the way | |
| R. Welton Oakes | | | From our midst loved ones are going | |
| T. F. Oakes | | | God of the earth and boundless sea | |
| Emily S. Oakey | F | 1829 -- 1883 | Sa'nde S'den ved Morgenroed | |
| Anna F. Oakley | F | | What a wonderful change in my heart there has been | |
| Charles E. Oakley | M | 1832 -- 1865 | Hills of the north, rejoice | |
| Ebenezer S. Oakley | | | In life's earnest morning | |
| Paul Oakley | M | | [Fire] | |
| William Henry Oakley, 1809-1881 | M | | | CONTRITION |
| A. A. Oakman | | | By thy redeeming cross, O Lord | |
| W. R. Oaks | | | Beyond the gaining and declining | |
| G. Oates | U | | | ATLANTIC |
| J. A. Oates | | | Jesus wants you to follow | |
| Johnson Oatman, Jr. | M | 1856 -- 1922 | There's not a friend like the lowly Jesus | HARPER MEMORIAL |
| Miriam E. Oatman | F | 1887 -- 1987 | Christian soldiers for the conflict | |
| Bert F. Ober | | | For sunrise that greets us each morning | |
| E. M. Oberg | F | | Bookmen of the S.D.A. | |
| S. L. Oberholtzer | F | | Happy children we, to sing | |
| Jean Frederic Oberlin | | | O Lord, thy heavenly grace impart, And fix my frail inconstant heart | |
| A. F. Oberndorfer | | | | |
| A. S. F. Oberndorfer | | | He is sleeping in a manger | |
| Francis Patrick O'Brien | M | | Protect me, Lord; I come to your for safety | |
| Mary L. O'Brien | F | | Creator of the world we know | |
| William R. O'Brien | M | | | JALAN |
| Fintan O’Carroll, 1922-1981 | M | 1922 -- 1981 | Alleluia, alleluia! | CELTIC ALLELUIA |
| Samson Occum | U | 1723 -- 1792 | Erwacht von Sinais Schrecken-Schall | |
| Ocean Grove Association | U | | | |
| S.C. Ochieng Okeyo | U | | I believe in God the almighty, Ninasadiki | |
| Phil Ochs | | | What's that I hear now ringin' in my ear | |
| Georgius Aemilius Ocmler | | | Wie lieblich ist, Herr Zebaoth | |
| William O'Connell | M | | O holy name of majesty and power | |
| John O'Connor | M | | Jesu, the dying day hath left us lonely | |
| G. O'Connor-Morris | U | | Saw ye my Saviour? Heard ye the glad sound? | FAITH |
| Roc O'Connor, SJ | M | 1949 - | Shout with joy to the Lord, all the earth! | |
| Donough O'Daly | | | O fair is our Lord's own city | |
| J. H. O'Daniel | | | Now the war is all o'er and the boys have come | |
| Mac O'Dell | | | Swiftly time is passing | |
| S. G. Odell | | | My Beloved is so fair | [My Beloved is so fair] |
| C. N. Oden | | | I am on my way to that fair city | |
| W. H. Odenheimer | | | | |
| H. Odgen | | | Prepare, prepare to meet the Savior | |
| Vincent C. Odhner | | | Thine advent, Lord, we hail | |
