- Orthodoxy (English) by Chesterton, G. K. (Gilbert Keith)
- Orthodoxy (English) by Chesterton, G. K. (Gilbert Keith)
- Osage Traditions (English) by Dorsey, James Owen
- Oscar - The Boy Who Had His Own Way (English) by Aimwell, Walter, [pseud.]
- Oscar the Detective - Or, Dudie Dunne, The Exquisite Detective (English) by Halsey, Harlan Page
- Oscar Wilde, His Life and Confessions — Volume 1 (English) by Harris, Frank
- Oscar Wilde, Volume 1 (of 2) - His Life and Confessions (English) by Harris, Frank
- Oscar Wilde, Volume 2 (of 2) - His Life and Confessions (English) by Harris, Frank
- Os fidalgos da Casa Mourisca - Chronica da aldeia (Portuguese) by Dinis, Júlio, [pseud.]
- Os Lusiadas (Portuguese) by Camões, Luís de
- Os meus amores - contos e balladas (Portuguese) by Coelho, Trindade
- Os Simples (Portuguese) by Junqueiro, Guerra
- O. T. a Danish Romance (English) by Andersen, Hans Christian
- O, Tannenbaum (German) by Nebe Quartett
- Othello (Finnish) by Cajander, Paavo
- Othello (French) by Guizot, François Pierre Guillaume
- Othello (German) by Hauff, Wilhelm
- Othello (English) by Shakespeare, William
- Othello (English) by Shakespeare, William
- Othello (English) by Shakespeare, William
- Othello (English) by Shakespeare, William
- Othello (Finnish) by Shakespeare, William
- Othello (French) by Shakespeare, William
- Othello (German) by Shakespeare, William
- Othello (German) by Wieland, Christoph Martin
- The Other Girls (English) by Whitney, A. D. T. (Adeline Dutton Train)
- Other People's Money (English) by Gaboriau, Émile
- Other Tales and Sketches - (From: "The Doliver Romance and Other Pieces: Tales and Sketches") (English) by Hawthorne, Nathaniel
- Other Things Being Equal (English) by Wolf, Emma
- Other Worlds - Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries (English) by Serviss, Garrett P. (Garrett Putman)
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