| Title | Composer First Name | Composer Last Name | Copies | Season | Voicing |
|---|---|---|---|---|---|
| Oh Come Oh Come Emmanuel | Ludwig | Lenel | 14 | Advent | SAB |
| Oh How Beautiful | John | Horman | 33 | General | SATB |
| Oh Jesus Grant Me Hope and Comfort | Johan W | Franck | 17 | General | SATB |
| Oh Lord In Thee Have I Trusted | George F. | Handel | 30 | General | SATB |
| Oh, How Good It Is | Lloyd | Larson | 10 | General | 2-part |
| Old Hundredth Psalm Tune The | R | Vaughan Williams | 65 | General | SATB |
| Omnipotence/The | Franz | Schubert | 19 | General | SATB |
| On Christmas Night | Ralph Vaughan | Williams | 51 | Christmas | SATB |
| On the Passion of the Christ | David H. | Williams | 35 | Lent | SATB |
| On This Earth Shall Ring | David | Cherwien | 35 | Christmas | 2-part |
| One Hundred Fiftieth Psalm/The | Howard | Hanson | 30 | General | SATB |
| Onward Ye Saints | Robert | Wetzler | 35 | SATB | |
| Open Our Eyes | Will | Macfarlane | 22 | General | SATB |
| Open the Gates of the Temple | Mrs. Joseph F. | Knapp | 12 | General | SAB |
| Open Thou Mine Eyes | John | Rutter | 31 | Lent | SATB |
| Our Refuge and Strength | Eugene | Butler | 25 | General | SATB |
| Out of the deep have I called unto Thee | W | Mozart | 22 | General | SATB |
| Palm Sunday Processional | John | Carter | 36 | Palm Sunday | SATB |
| Palms/The | J. | Faure | 15 | Palm Sunday | SATB |
| Parting Blessing. A | J. Jerome | Williams | 11 | SATB | |
| Peace I Leave With You | Jan Philip | Schinhan | 13 | General | SATB |
| Peace I Leave With You | Felix | Mendelssohn | 26 | General | SATB |
| Peace I Leave With You | Felix | Mendelssohn | 30 | General | SATB |
| Peace of God. The | Douglas | Wagner | 35 | General | 2-part |
| Peace of God/The | Douglas | Wagner | 32 | General | 2-part |