- One of the 28th - A Tale of Waterloo (English) by Henty, G. A. (George Alfred)
- One Third Off (English) by Cobb, Irvin S. (Irvin Shrewsbury)
- One Third Off (English) by Sarg, Tony
- One Thousand Questions in California Agriculture Answered (English) by Wickson, Edward J. (Edward James)
- The One Woman (English) by Dixon, Thomas
- One Woman's Life (English) by Herrick, Robert
- One Wonderful Night - A Romance of New York (English) by Tracy, Louis
- One Young Man - The simple and true story of a clerk who enlisted in 1914, who fought on the western front for nearly two years, was severely wounded at the battle of the Somme, and is now on his way back to his desk. (English) by Hodder-Williams, J. E. (John Ernest)
- On Heroes and Hero Worship and the Heroic in History (English) by Carlyle, Thomas
- On Horseback (English) by Warner, Charles Dudley
- On Horsemanship (English) by Dakyns, Henry Graham
- On Horsemanship (English) by Xenophon
- On Land and Sea at the Dardanelles (English) by Bridges, Thomas Charles
- On Limitations To The Use Of Some Anthropologic Data (English) by Powell, John Wesley
- The Online World (English) by De Presno, Odd
- The Onlooker, Volume 1, Part 2 (English) by Lewis, Alfred Henry
- The Onlooker, Volume 1, Part 2 (English) by Various
- Only an Incident (English) by Litchfield, Grace Denio
- Only an Irish Boy - Andy Burke's Fortunes (English) by Alger, Horatio
- The Only True Mother Goose Melodies (English) by Anonymous
- Onnen orja (Finnish) by Leino, Eino
- On Nothing and Kindred Subjects (English) by Belloc, Hilaire
- On Our Selection (English) by Rudd, Steele
- On Picket Duty, and Other Tales (English) by Alcott, Louisa May
- On Revenues (English) by Dakyns, Henry Graham
- On Revenues (English) by Xenophon
- On Some Fossil Remains of Man (English) by Huxley, Thomas Henry
- On Something (English) by Belloc, Hilaire
- Ons Vaderland van de vroegste tijden tot de 15de eeuw (Dutch) by Lievevrouw-Coopman, M.
- Ontario Normal School Manuals: Science of Education (English) by Ontario Ministry of Education
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