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| Open Door, Revival Songs. Rev. ed. | Nathaniel Carlson; Beacon Book Store | Beacon Book Store | Minneapolis, Minn. | 1951 | | | 64 | | 2888072 |
| Open Gates | Fillmore Music House | Fillmore Music House | Cincinnati, Oh. | 1928 | | | 10 | | 2888074 |
| Oramos Cantando = We Pray In Song | Rev. Ronald F. Krisman; GIA Publications | GIA Publications, Inc. | Chicago | 2013 | Roman Catholic Church | Spanish; Has Music | 1068 | | 2894411 |
| Orders of Worship for the Sunday School | D. E. Curtis; Congregational Sunday School and Publishing Society | Congregational Sunday School and Publishing Society | Boston, Mass. | 1890 | Congregational Christian Churches, 1931- | | 25 | | 2888075 |
| Ordo de Diservo | J. Cyprian Rust (Soham, Cambs.) | La Tria Kongreso | England | 1907 | Church of England | Esperanto | 27 | | 2894138 |
| Original and Select Hymns, and Sacred Pindoric Odes., few of which have ever been published (1st. ed.) | Paris M. Davis; Jonathan Howe | Jonathan Howe (Printer) | Boston | 1830 | | | 66 | | 2888077 |
| Original and Selected Reformation Hymns ... dedicated to the Twelve Tribes of the Lord's Modern Israel | Luther Roby | Luther Roby | Concord, N.H. | 1829 | | | 113 | | 2888079 |
| Original Hymns for Sabbath Schools | J. S. W.; Lilly, Wait, Colman, & Holden | Lilly, Wait, Colman, & Holden | Boston | 1833 | | | 57 | | 2888080 |
| Original Sacred Harp Denson Revision 1987 Standard Melodies | | Sacred Harp Publishing Co., Inc. | Bremen, Georgia 30110 | 1987 | | Shape Note | 40 | | 2894922 |
| Original Shaker Music | Wm. A. Pond & Company; North Family of Mt. Lebanon, NY | Wm. A. Pond & Company | New York | 1893 | Shakers | | 219 | | 2888082 |
| Oriola | W. B. Bradbury; Biglow & Main Co. | Biglow & Main Co. | New York, N.Y. | 1859 | | | 306 | | 2888084 |
| Oriola | W. B. Bradbury; Biglow & Main Co. | Biglow & Main Co. | New York, N.Y. | 1890 | | | 314 | | 2888086 |
| Oswald Smith's Best Songs | Dr. Oswald J. Smith; The Rodeheaver, Hall-Mack Company | The Rodeheaver, Hall-Mack Company | | 1958 | | Has Music | 62 | | 2895181 |
| Our Best Endeavor | W. A. Ogden; C. E. Prior; Silver Burdett | Silver Burdett | Boston, Mass. | 1892 | | | 181 | | 2888088 |
| Our Choice | C. H. Gabriel; Pentecostal Pub. Co. | Pentecostal Pub. Co. | Louisville, Ky. | 1913 | | | 224 | | 2888091 |
| Our Church and Revival Songs | David E. Dortch; William G. Cooper; Gospel Winchester Co. | Gospel Winchester Co. | Tullahoma, Tenn. | 1911 | | | 115 | | 2888093 |
| Our Cumberland Presbyterian Hymnal | David E. Dortch; Gospel Winchester Co. | Gospel Winchester Co. | Tullahoma, Tenn. | 1911 | Cumberland Presbyterian Church | | 416 | | 2888096 |
| Our Family Circle | Ernest Dunklee | Dunklee | South Vernon, Mass. | 1950 | Advent Christian Church | | 60 | | 2888098 |
| Our Favorite Hymnal | W. A. Chastain | | Springfield, Ill. | 1938 | Primitive (Old School) Baptists | | 378 | | 2888099 |
| Our Glad Hosanna: for the service of Song in the Sunday School, the Social Gathering, and the Prayer Meeting | Rev. Robert Lowry; W. Howard Doane; Biglow & Main | Biglow & Main | New York, N.Y. | 1882 | | Has Music | 339 | | 2888100 |
| Our Growing Years: a hymnal | | GIA Publications, Inc. | Chicago | 1998 | | | 14 | | 2895014 |
| Our Hymns of Love, a Choice Collection of Gospel Songs | Quartet Music Co. | Quartet Music Co. | Ft. Worth, Tex. | 1909 | | | 251 | | 2888103 |
| Our Hymns of Praise | J. Mark Stauffer; Herald Press | Herald Press | Scottdale, Penn. | 1958 | Mennonite hymnals (general) | | 121 | | 2888104 |
| Our Hymns of Praise (Rev. ed.) | | Prism Productions | Greencastle, PA | 1996 | | Shape Note; For Children | 5 | | 2894899 |
| Our Hymns: compiled for use in the services of the Baptist Temple | Russell H. Conwell, LL.D.; Harry C. Jones; Robert B. Liddell; David D. Wood, Mus. Doc.; John J. Hood | John J. Hood | Philadelphia | 1903 | Philadelphia Baptist Association | Has Music | 272 | | 2893604 |
| Our Leader | Thomas S. Cobb; Firm Foundation Pub. House | Firm Foundation Pub. House | Austin, Tex. | 1941 | | | 178 | | 2888106 |
| Our New Book for Sunday Schools, Prayer, Praise and Gospel Meetings | J. B. Vaughan; J. B. Vaughan & Co. | J. B. Vaughan & Co. | Bowman, Ga. | 1888 | | | 86 | | 2888108 |
| Our New Hymnal | | Funk & Wagnalls Co. | New York, N.Y. | 1893 | | | 532 | | 2699357 |
| Our New Songs, No.1 | Lyon Music Co. | Lyon Music Co. | Atlanta, Ga. | 1900 | | | 31 | | 2888112 |
| Our Parish Prays and Sings: Dialog Mass, Hymns, Chants | Order of St. Benedict; Liturgical Press | Liturgical Press | Collegeville, Minn. | 1959 | Roman Catholic Church | | 65 | | 2888113 |
| Our Praise in Song: a collection of hymns and sacred melodies, adapted for use by Sunday schools, Endeavor societies, Epworth Leagues, evangelists, pastors, choristers, etc. | Jno R. Sweney; W. J. Kirkpatrick; H. L. Gilmour; John J. Hood | John J. Hood | Philadelphia, Penn. | 1893 | | | 229 | | 2888115 |
| Our Redeemer, Our 1953 Book for Church, Singing Schools and Conventions | Orvin S. Davis; Thompson Music Co. | Thompson Music Co. | Lake Charles, La. | 1953 | | | 150 | | 2888119 |
| Our Sabbath Home Praise Book | Jno. R. Sweney; Wm. J. Kirkpatrick; John J. Hood | John J. Hood | Philadelphia, Penn. | 1884 | | Has Music | 198 | | 2888121 |
| Our Service of Song | Printed for the Compiler | Printed for the Compiler | Toronto, Ont. | 1875 | Canadian Baptists | | 303 | | 2888124 |
| Our Song Book: a collection of songs selected and edited expressly for the Sunday School of the First Baptist Peddie Memorial Church, Newark, N. J. | E. M. Bowman; Biglow & Main | Biglow & Main | New York | 1890 | Baptist hymnals (general) | Has Music | 206 | | 2888125 |
| Our Song Wreath | J. B. Vaughan; A. J. Showalter & Co. | A. J. Showalter & Co. | Dalton, Ga. | 1885 | | | 31 | | 2888127 |
| Our Songs of Faith | G. W. Bacon; Teachers' Music Publishing Co. | Teachers' Music Publishing Co. | Hudson, N.C. | 1927 | | | 176 | | 2888129 |
| Our Songs of Praise | Edward W. Klammer; Concordia Publishing House | Concordia Publishing House | St. Louis, Mo. | 1953 | Lutheran Church - Missouri Synod | | 136 | | 2888131 |
| Our Sunday School Hymnody | J. A. Cross; C. E. Dudley; E. F. de Selding | E. F. de Selding | Brooklyn, N.Y. | 1871 | | | 108 | | 2888135 |
| Our Sunday School: for the Sunday school and social meetings | J. E. Trowbridge; J. M. Russell | J. M. Russell | Boston | 1879 | | | 116 | | 2888133 |
| Our Sunday-School Songs | E. H. Johnson; American Baptist Publication Society | American Baptist Publication Society | Philadepia | 1885 | | Has Music | 137 | | 2896151 |
| Our Thankful Songs | A. J. Showalter; A. J. Showalter Co. | A. J. Showalter Co. | Dalton, Ga. | 1900 | | | 243 | | 2888138 |
| Our Treasury of Song, for Use in the Emmanuel Baptist Church | S. Alman; H. Main; Biglow & Main Co. | Biglow & Main Co. | New York, N.Y. | 1883 | Baptist hymnals (general) | | 337 | | 2888140 |
| Oxford Book of Carols | Ralph Vaughan Williams; Percy Dearmer; Martin Shaw | Oxford University Press | London et al. | 1928 | | Christmas | 222 | | 2895586 |