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| Ocean Melodies, and Seamen's Companion: a collection of hymns and music; for the use of Bethels, Chaplains of the Navy and private devotion of Mariners | Phineas Stow | Phineas Stow | Boston | 1849 | Baptist hymnals (general) | | 379 |  | | 3019112 |
| Offering of Praise | J. L. Hall; C. A. Miles; Hall Mack Co. | Hall Mack Co. | Philadelphia, Penn. | 1911 | | | 224 | | | 3019113 |
| Offices of Worship and Hymns: principally for use in schools. with an appendix of tunes (2nd and rev. ed.) | Moravian Pub. Office | Moravian Pub. Office | Bethlehem, Penn. | 1883 | Moravian Church in America (Unitas Fratrum) | | 389 |  | | 3019116 |
| Offices of Worship and Hymns: with tunes, 3rd ed., revised and enlarged | Moravian Publication Office | Moravian Publication Office | Bethlehem, Penn. | 1891 | Moravian Church in America (Unitas Fratrum) | | 1565 |  | | 3019117 |
| Ogle's Praise Hymns and Revivalist | John J. Hood | John J. Hood | Philadelphia, Penn. | 1883 | | | 73 | | | 3019118 |
| Okodakiciye Wakan Odowan Qa Okna Ahiyayapi Kta Ho Kin/Hymnal with Tunes and Chants According to the Use of the Episcopal Church in the Missions among the Dakotas | | Midwest-Beach Co. | Sioux Falls, SD | 1951 | Episcopal Church | | 248 | | | 3025316 |
| Old and New Songs of the Church | Rodeheaver Co. | Rodeheaver Co. | Chicago, Ill. | 1935 | | | 66 |  | | 3019119 |
| Old and New Welsh and English Hymns | Cymanfa Ganu | Cymanfa Ganu | Wisconsin | 1939 | | | 338 | | | 3019120 |
| Old Camp Meeting Songs | Albert Ott | | Dallas, Tex. | 1940 | | | 183 | | | 3019121 |
| Old Choir Selections | Synod of the Maritime Provinces | Synod of the Maritime Provinces | Canada | 1942 | Presbyterian Church in Canada | | 62 | | | 3019122 |
| Old Fashioned Gospel Songs No. 1 | Philadelphia Book Concern | Philadelphia Book Concern | Chicago, Ill. | 1946 | | Has Music | 28 |  | | 3026066 |
| Old Fashioned Revival Hour Songs | Charles E. Fuller; The Rodeheaver, Hall-Mack Company; H. Leland Greend; William MacDougall | The Rodeheaver, Hall-Mack Company | Winona Lake, Ind. | 1950 | | Has Music | 129 |  | | 3019123 |
| Old Melodies Spiritualized | H. W. Boozer | | Grand Rapids, Mich. | 1896 | | | 54 | | | 3019127 |
| Old Path Hymnal Number 2 | Homer L. King | Old Paths Advocate | Stockton, California | 1967 | Churches of Christ | | 0 | | | 3027136 |
| Old School Sonnets, or a Selection of Choice Hymns | James Osbourn; John D. Toy | John D. Toy | Baltimore, Md. | 1836 | Primitive (Old School) Baptists | | 340 | | | 3019128 |
| Old Songs of the Church | Hall-Mack Co. | Hall-Mack Co. | Philadelphia, Pa. | 1930 | | Has Music | 72 |  | | 3027709 |
| Old Time Glory | John T. Benson, Jr.; John T. Benson Pub. Co. | John T. Benson Publishing Co. | Nashville, Tenn. | 1949 | | | 140 |  | | 3019130 |
| Old Time Revival | John T. Benson Publishing Co. | John T. Benson Publishing Co. | Nashville, Tenn. | 1950 | | | 145 |  | | 3019132 |
| Old Time Revival Songs | Alfred E. Smith; Alfred E. Smith | Alfred E. Smith | Wheaton, IL | 1950 | | | 147 | | | 3019133 |
| Old-Line Primitive Baptist Hymn and Tune Book | Jason R. Fruit | Jason R. Fruit | Fox Lake, WI | 2016 | Primitive Baptists | | 10 | | | 3025640 |
| Old-Time White Camp-Meeting Spirituals | Samuel E. Asbury; Henry E. Meyer; Texas Folk-Lore Society Publications | Texas Folk-Lore Society Publications | Austin, Tex. | 1932 | | | 8 | | | 3019135 |
| Oliver's "Songs of Deliverance" | Rev. French E. Oliver | Rev. French E. Oliver, Publisher | Kansas City, Mo. | 1908 | | | 0 | | | 3026229 |
| On Joyful Wing : A Book of Praise and Song | John R. Sweney; Wm. J. Kirkpatrick | John J. Hood | Philadelphia | 1886 | | | 181 |  | | 3025362 |
| On Wings of Song | Geo.C. Hugg; Geo.C. Hugg | Geo. C. Hugg | Philadelphia, Penn. | 1896 | | | 207 |  | | 3019138 |
| One and All Rejoice | | Concordia Publishing House | | 2020 | | | 200 | | | 3027050 |
| One Faith, Una Voz | John J. Limb | OCP | Portland, OR | 2005 | Roman Catholic Church | | 21 |  | 1 | 3025137 |
| One Hundred Choice Hymns: in large type | James Taylor | James Taylor | Edinburgh | 1882 | | | 108 |  | | 3027093 |
| One Hundred Choice Hymns: in large type | F. H. Revell | F. H. Revell | Chicago | 1874 | | | 108 |  | | 3027094 |
| One Hundred Favorite Songs and Music: of the Salvation Army | Commander Booth Tucker; The Salvation Army Publishing House | The Salvation Army Publishing House | New York | 1899 | | Has Music | 176 |  | | 3024883 |
| One Hundred Favorite Songs of the Salvation Army | Booth-Tucker | | | 1893 | Salvation Army | | 171 | | | 3019140 |
| One Hundred Gospel Hymns: for male voices | D. B. Towner; Rev. E. M. Fuller; The Bible Institute Colportage Association | The Bible Institute Colportage Association | Chicago | 1902 | | Has Music | 103 |  | | 3026800 |
| One Hundred Hymns You Ought to Know | Henry F. Cope; Fleming H. Revell Company | Fleming H. Revell Company | Chicago, New York, Toronto, London, Edingburgh | 1906 | | | 100 |  | | 3019141 |
| One Hundred Non-Sectarian Hymns for Use in Church and Home. 10 vols. in 1 | A. J. Davis; G. Schirmer | G. Schirmer | New York, N.Y. | 1886 | | | 83 | | | 3019143 |
| One Hundred Progressive Hymns | Henry B. Ashmead | Henry B. Ashmead | Philadelphia | 1860 | | | 100 |  | | 3019145 |
| One Hundred Select Gospel Hymns from Gospel Hymns Consolidated | I. D. Sankey; Biglow & Main Co. | Biglow & Main Co. | Chicago, Ill. | 1883 | | | 95 | | | 3019146 |
| One Hundred Songs of Praise: used by Andrew J. Dolbow in his evangelistic services | Andrew J. Dolbow; John J. Hood | John J. Hood | Philadelphia | 1890 | | | 100 |  | | 3025065 |
| One in Faith | | World Library Publications | Franklin Park, IL | 2015 | Roman Catholic Church | Has Music | 964 |  | 1 | 3026035 |
| One Lord, One Faith, One Baptism: an African American ecumenical hymnal | James Abbington | GIA Publications, Inc. | Chicago | 2018 | | African American; Has Music | 698 |  | 1 | 3026094 |
| One More New Hymn for Youth by Youth | The Hymn Society of America | The Hymn Society of America | New York, NY | 1959 | | | 1 | | | 3025543 |
| Onward and Upward | E. T. Hildebrand; J. D. Vaughan; Home Music Co. | Home Music Co. | Logansport, Ind. | 1898 | | | 110 | | | 3019148 |
| Onward and Upward No. 2: a collection of gospel songs and hymns for Sunday-schools, Endeavor societies, Epworth leagues, devotional meetings, chapel exercises, revivals, etc. | W. T. Giffe; E. T. Hildebrand; The Home Music Co. | The Home Music Co. | Logansport, Ind. | 1900 | | Has Music | 109 |  | | 3019151 |
| Onward! | Brian Wren | Hope | Carol Stream, IL | 2016 | | | 0 | | | 3026190 |
| Onward: a Complete Rally Day Service | Judefind Bros. | Judefind Bros. | Baltimore, Md. | 1911 | | | 11 | | | 3019154 |
| Open Door, Revival Songs. Rev. ed. | Nathaniel Carlson; Beacon Book Store | Beacon Book Store | Minneapolis, Minn. | 1951 | | | 64 | | | 3019155 |
| Open Gates | Fillmore Music House | Fillmore Music House | Cincinnati, Oh. | 1928 | | | 10 | | | 3019157 |
| Oramos Cantando = We Pray In Song | Rev. Ronald F. Krisman; GIA Publications | GIA Publications, Inc. | Chicago | 2013 | Roman Catholic Church | Spanish; Has Music | 1068 |  | 1 | 3025499 |
| 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 | | | 3019158 |
| Ordo de Diservo | J. Cyprian Rust (Soham, Cambs.) | La Tria Kongreso | England | 1907 | Church of England | Esperanto | 27 |  | | 3025225 |
| 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 |  | | 3019160 |
| 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 | | | 3019162 |