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| O Sing unto the Lord a New Song No. 2: a group of songs | David J. Becker | [Unknown] | Detroit Lakes, Minn. | 1941 | Evangelical Free Church of America | Has Music | 20 | | | 2888021 |
| Oak Leaf Collection of Junior Chorales | L. Rhea; Edwin H. Morris & Co. | Edwin H. Morris & Co. | New York, N.Y. | 1951 | | | 5 | | | 2888022 |
| Oberlin Harmony | | | Oberlin, Ohio | 2002 | | | 18 | | | 2717023 |
| Oberlin social & sabbath school hymn book | George N. Allen | James N. Fitch | Oberlin | 1846 | | | 221 | | | 2893578 |
| Occasional and Textual Hymns: by the Rev. Joseph Dana, D.D. Pastor of the South Church and Society 1765--1827 | Rev. Joseph Dana, D.D. | Augustine Caldwell, Printer | Ipswich, Mass. | 1905 | | | 42 | | | 2893758 |
| Ocean Grove Christian Songs: "The Big Little Book" | Tali Esen Morgan; Bishop J. A. Fitzgerald; Rev. Chas. H. Yatman; Tali Esen Morgan | Tali Esen Morgan | Ocean Grove, N.J. | 1902 | Methodist hymnals (general) | Has Music | 170 | | | 2888024 |
| Ocean Grove Christian Songs: and responsive readings (Revised Edition) | Tali Esen Morgan | Tali Esen Morgan | Ocean Grove | 1903 | Methodist Episcopal Church | Has Music | 190 | | | 2893665 |
| Ocean Grove Songs | Bishop J. N. Fitzgerald; Rev. Chas. H. Yatman; Tali Esen Morgan; The Ocean Grove Association | The Ocean Grove Association | Ocean Grove, N. J. | 1900 | Methodist Episcopal Church | Has Music | 164 | | | 2888031 |
| 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 | | | 2888032 |
| Offering of Praise | J. L. Hall; C. A. Miles; Hall Mack Co. | Hall Mack Co. | Philadelphia, Penn. | 1911 | | | 224 | | | 2888033 |
| 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 | | | 2888036 |
| 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 | | | 2888037 |
| Ogle's Praise Hymns and Revivalist | John J. Hood | John J. Hood | Philadelphia, Penn. | 1883 | | | 73 | | | 2888038 |
| 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 | | | 2894230 |
| Old and New Songs of the Church | Rodeheaver Co. | Rodeheaver Co. | Chicago, Ill. | 1935 | | | 66 | | | 2888039 |
| Old and New Welsh and English Hymns | Cymanfa Ganu | Cymanfa Ganu | Wisconsin | 1939 | | | 338 | | | 2888040 |
| Old Camp Meeting Songs | Albert Ott | | Dallas, Tex. | 1940 | | | 183 | | | 2888041 |
| Old Choir Selections | Synod of the Maritime Provinces | Synod of the Maritime Provinces | Canada | 1942 | Presbyterian Church in Canada | | 62 | | | 2888042 |
| Old Fashioned Gospel Songs No. 1 | Philadelphia Book Concern | Philadelphia Book Concern | Chicago, Ill. | 1946 | | Has Music | 28 | | | 2894978 |
| 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 | | | 2888043 |
| Old Melodies Spiritualized | H. W. Boozer | | Grand Rapids, Mich. | 1896 | | | 54 | | | 2888047 |
| Old Path Hymnal Number 2 | Homer L. King | Old Paths Advocate | Stockton, California | 1967 | Churches of Christ | | 0 | | | 2896048 |
| 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 | | | 2888048 |
| Old Time Glory | John T. Benson, Jr.; John T. Benson Pub. Co. | John T. Benson Publishing Co. | Nashville, Tenn. | 1949 | | | 140 | | | 2888050 |
| Old Time Revival | John T. Benson Publishing Co. | John T. Benson Publishing Co. | Nashville, Tenn. | 1950 | | | 145 | | | 2888052 |
| Old Time Revival Songs | Alfred E. Smith; Alfred E. Smith | Alfred E. Smith | Wheaton, IL | 1950 | | | 147 | | | 2888053 |
| Old-Line Primitive Baptist Hymn and Tune Book | Jason R. Fruit | Jason R. Fruit | Fox Lake, WI | 2016 | Primitive Baptists | | 10 | | | 2894553 |
| 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 | | | 2888055 |
| Oliver's "Songs of Deliverance" | Rev. French E. Oliver | Rev. French E. Oliver, Publisher | Kansas City, Mo. | 1908 | | | 0 | | | 2895140 |
| On Joyful Wing : A Book of Praise and Song | John R. Sweney; Wm. J. Kirkpatrick | John J. Hood | | 1886 | | | 181 | | | 2894276 |
| On Wings of Song | Geo.C. Hugg; Geo.C. Hugg | Geo. C. Hugg | Philadelphia, Penn. | 1896 | | | 207 | | | 2888058 |
| One and All Rejoice | | Concordia Publishing House | | 2020 | | | 200 | | | 2895962 |
| One Faith, Una Voz | John J. Limb | OCP | Portland, OR | 2005 | Roman Catholic Church | | 21 | | 1 | 2894052 |
| One Hundred Choice Hymns: in large type | James Taylor | James Taylor | Edinburgh | 1882 | | | 108 | | | 2896005 |
| One Hundred Choice Hymns: in large type | F. H. Revell | F. H. Revell | Chicago | 1874 | | | 108 | | | 2896006 |
| 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 | | | 2893795 |
| One Hundred Favorite Songs of the Salvation Army | Booth-Tucker | | | 1893 | Salvation Army | | 171 | | | 2888060 |
| 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 | | | 2895712 |
| 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 | | | 2888061 |
| 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 | | | 2888063 |
| One Hundred Progressive Hymns | Henry B. Ashmead | Henry B. Ashmead | Philadelphia | 1860 | | | 100 | | | 2888065 |
| One Hundred Select Gospel Hymns from Gospel Hymns Consolidated | I. D. Sankey; Biglow & Main Co. | Biglow & Main Co. | Chicago, Ill. | 1883 | | | 95 | | | 2888066 |
| 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 | | | 2893977 |
| One in Faith | | World Library Publications | Franklin Park, IL | 2015 | Roman Catholic Church | Has Music | 964 | | 1 | 2894947 |
| One Lord, One Faith, One Baptism: an African American ecumenical hymnal | James Abbington | GIA Publications, Inc. | Chicago | 2018 | | African American; Has Music | 698 | | 1 | 2895006 |
| One More New Hymn for Youth by Youth | The Hymn Society of America | The Hymn Society of America | New York, NY | 1959 | | | 1 | | | 2894456 |
| Onward and Upward | E. T. Hildebrand; J. D. Vaughan; Home Music Co. | Home Music Co. | Logansport, Ind. | 1898 | | | 110 | | | 2888068 |
| 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 | | | 2888071 |
| Onward! | Brian Wren | Hope | Carol Stream, IL | 2016 | | | 0 | | | 2895101 |
| Onward: a Complete Rally Day Service | Judefind Bros. | Judefind Bros. | Baltimore, Md. | 1911 | | | 11 | | | 2888074 |