- Oliver Twist (French) by Dickens, Charles
- Oliver Wendell Holmes (from Literary Friends and Acquaintance) (English) by Howells, William Dean
- Olivia in India (English) by Douglas, O.
- O Livro de Cesario Verde (Portuguese) by Verde, Cesario
- Olviretki Schleusingenissä; Leo ja Liina; Alma (Finnish) by Kivi, Aleksis
- Olympian Nights (English) by Bangs, John Kendrick
- The Olynthiacs and the Phillippics of Demosthenes - Literally translated with notes (English) by Demosthenes
- The Olynthiacs and the Phillippics of Demosthenes - Literally translated with notes (English) by Kennedy, Charles Rann
- Omaha Dwellings, Furniture and Implements - Thirteenth Annual Report of the Beaurau of American - Ethnology to the Secretary of the Smithsonian Institution - 1891-1892, Government Printing Office, Washington, 1896 - pages 263-288 (English) by James Owen Dorsey
- O Mandarim (Portuguese) by Queiroz, José Maria Eça de
- Omatunto - Saaristokertomus (Finnish) by Aho, Juhani
- A l'ombre des jeunes filles en fleurs — Volume 1 (French) by Proust, Marcel
- A l'ombre des jeunes filles en fleurs — Volume 2 (French) by Proust, Marcel
- A l'ombre des jeunes filles en fleurs — Volume 3 (French) by Proust, Marcel
- Omhoog in het luchtruim! Praatje over het luchtvaartvraagstuk - De Aarde en haar Volken, 1908 (Dutch) by Uildriks, Frederike J. van
- Omnilingual (English) by Freas, Kelly
- Omnilingual (English) by Piper, H. Beam
- Omoo (English) by Melville, Herman
- Omoo (English) by Melville, Herman
- Om utvandringen, dess betydelse och orsaker - Föredrag, hållet i Stockholm den 25 och den 28 November samt i Upsala - den 3 December 1881 (Swedish) by Wicksell, Knut
- Om viljans frihet - Ett föredrag (Swedish) by Schéele, Frans von
- De omwenteling van 1830 (Dutch) by Conscience, Hendrik
- Omzwervingen door de eilandenwereld van den Grooten-oceaan - De Aarde en haar Volken, 1887 (Dutch) by Anonymous
- Omzwervingen door de eilandenwereld van den Grooten Oceaan: De Fidji-eilanden - De Aarde en haar Volken, 1888 (Dutch) by Anonymous
- On a Dynamical Top, for exhibiting the phenomena of the motion of a system of invariable form about a fixed point, with some suggestions as to the Earth's motion (English) by Maxwell, James Clerk
- On a Torn-Away World - Or, the Captives of the Great Earthquake (English) by Rockwood, Roy
- On Being Human (English) by Wilson, Woodrow
- On Books and the Housing of Them (English) by Gladstone, W. E. (William Ewart)
- Once Aboard the Lugger (English) by Hutchinson, A. S. M. (Arthur Stuart-Menteth)
- Once Upon A Time (English) by Davis, Richard Harding
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