- Oeuvres de Napoléon Bonaparte, Tome I. (French) by Bonaparte, Napoléon
- Oeuvres de Napoléon Bonaparte, Tome II. (French) by Bonaparte, Napoléon
- Oeuvres de Napoléon Bonaparte, Tome III. (French) by Bonaparte, Napoléon
- Oeuvres de Napoléon Bonaparte, Tome IV. (French) by Bonaparte, Napoléon
- Oeuvres de Napoléon Bonaparte, Tome V. (French) by Bonaparte, Napoléon
- Oeuvres illustrées de George Sand - Les visions de la nuit dans les campagnes - La vallée noire - Une - visite aux catacombes (French) by Sand, George
- Oeuvres poétiques Tome 1 (French) by Pisan, Christine de
- Oeuvres poétiques Tome 2 (French) by Pisan, Christine de
- O+F (English) by Wetterau, John Moncure
- Of Captain Mission (English) by Defoe, Daniel
- Off-Hand Sketches (English) by Arthur, T. S. (Timothy Shay)
- Official Report of the Exploration of the Queen Charlotte Islands for the Government of British Columbia (English) by Chittenden, Newton H. (Newton Henry)
- Off on a Comet (English) by Verne, Jules
- Off on a Comet! a Journey through Planetary Space (English) by Verne, Jules
- Of Human Bondage (English) by Maugham, W. Somerset (William Somerset)
- O'Flaherty V.C. : a recruiting pamphlet (English) by Shaw, George Bernard
- Of the Orthographie and Congruitie of the Britan Tongue - A Treates, noe shorter than necessarie, for the Schooles (English) by Hume, Alexander
- Of the Orthographie and Congruitie of the Britan Tongue - A Treates, noe shorter than necessarie, for the Schooles (English) by Wheatley, Henry Benjamin
- O. Henry Memorial Award Prize Stories of 1919 (English) by Various
- O. Henry Memorial Award Prize Stories of 1920 (English) by Various
- O. Henry Memorial Award Prize Stories of 1921 (English) by Various
- Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 - The Ascomycetes of Ohio IV and V (English) by Corrington, Leafy J.
- Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 - The Ascomycetes of Ohio IV and V (English) by Fink, Bruce
- Oh Little Town of Bethlehem (English) by Redner, Lewis
- Oh, Money! Money! (English) by Porter, Eleanor H. (Eleanor Hodgman)
- Ohne den Vater - Erzählung aus dem Kriege (German) by Sapper, Agnes
- Ojennusnuora (Finnish) by Epictetus, circa 55-135 AD
- Ojennusnuora (Finnish) by Jaakkola, K.
- Okewood of the Secret Service (English) by Williams, Valentine
- Oklahoma and Other Poems (English) by Miller, Freeman E. (Freeman Edwin)
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