- Oak Openings (English) by Cooper, James Fenimore
- Obed Hussey - Who, of All Inventors, Made Bread Cheap (English) by Greeno, Follett Lamberton
- Obed Hussey - Who, of All Inventors, Made Bread Cheap (English) by Various
- Oberheim (Voices) (English) by Leadem, Christopher
- Oberon (German) by Wieland, Christoph Martin
- Obiter Dicta (English) by Birrell, Augustine
- Object Lessons on the Human Body - A Transcript of Lessons Given in the Primary Department of School No. 49, New York City (English) by Buckelew, Sarah F.
- Object Lessons on the Human Body - A Transcript of Lessons Given in the Primary Department of School No. 49, New York City (English) by Lewis, Margaret W.
- Obras poéticas de Nicoláo Tolentino de Almeida, Tom. II (Portuguese) by Tolentino, Nicolau
- Observations and Reflections Made in the Course of a Journey through France, Italy, and Germany, Vol. I (English) by Piozzi, Hester Lynch
- Observations By Mr. Dooley (English) by Dunne, Finley Peter
- Observations Géologiques sur les Îles Volcaniques (French) by Darwin, Charles
- Observations Géologiques sur les Îles Volcaniques (French) by Renard, A.-F. (Alphonse-François)
- Observations of an Orderly - Some Glimpses of Life and Work in an English War Hospital (English) by Muir, Ward
- Observations of a Retired Veteran (English) by Tinsley, Henry C.
- The Observations of Henry (English) by Jerome, Jerome K. (Jerome Klapka)
- Observations on the Effects of the Corn Laws, and of a Rise or Fall in the Price of Corn on the Agriculture and General Wealth of the Country (English) by Malthus, T. R. (Thomas Robert)
- Observations on the Mussulmauns of India (English) by Ali, Mrs. Meer Hassan
- Observations upon the Prophecies of Daniel, and the Apocalypse of St. John (English) by Newton, Isaac
- Observations Upon the Windward Coast of Africa (English) by Corry, Joseph
- The Obstacle Race (English) by Dell, Ethel M. (Ethel May)
- O cancioneiro portuguez da Vaticana (Portuguese) by Braga, Teófilo
- Occasional Papers - Selected from the Guardian, the Times, and the Saturday Review, - 1846-1890 (English) by Church, R.W.
- Occasional Poems - Part 3 from Volume IV., the Works of Whittier: Personal Poems (English) by Whittier, John Greenleaf
- Occasional Thoughts in Reference to a Vertuous or Cristian life (English) by Masham, Lady Damaris Cudworth
- Occult Chemistry - Clairvoyant Observations on the Chemical Elements (English) by Besant, Annie Wood
- Occult Chemistry - Clairvoyant Observations on the Chemical Elements (English) by Leadbeater, C. W. (Charles Webster)
- Occult Chemistry - Clairvoyant Observations on the Chemical Elements (English) by Sinnett, A. P.
- An Occurrence at Owl Creek Bridge (English) by Bierce, Ambrose
- O'Conors of Castle Conor (English) by Trollope, Anthony
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