- Outlines of Universal History, Designed as a Text-book and for Private ReadingAuthor: George Park FisherLanguage: English
- OutpostAuthor: Jane G. (Jane Goodwin) AustinLanguage: English
- Outspoken EssaysAuthor: William Ralph IngeLanguage: English
- Outward Bound Or, Young America Afloat: A Story of Travel and AdventureAuthor: Oliver OpticLanguage: English
- Outwitting our nervesAuthor: Josephine A. (Josephine Agnes) Jackson, Helen M. SalisburyLanguage: English
- Over HereAuthor: Edgar A. (Edgar Albert) GuestLanguage: English
- Over literatuur: Critisch en didactischAuthor: M. H. Van CampenLanguage: Dutch
- Over literatuur: Critisch en didactisch, tweede bundelAuthor: M. H. Van CampenLanguage: Dutch
- Over Paradise Ridge: A RomanceAuthor: Maria Thompson DaviessLanguage: English
- Over Prairie TrailsAuthor: Frederick Philip GroveLanguage: English
- Over Strand and Field: A Record of Travel through BrittanyAuthor: Gustave FlaubertLanguage: English
- Over the Border: Acadia, the Home of "Evangeline"Author: Chase, Eliza B. (Eliza Brown)Language: English
- Over the Fireside with Silent FriendsAuthor: Richard KingLanguage: English
- Over the PassAuthor: Frederick PalmerLanguage: English
- Over the Rocky Mountains to AlaskaAuthor: Charles Warren StoddardLanguage: English
- Over the Rocky Mountains: Wandering Will in the Land of the RedskinAuthor: R. M. (Robert Michael) BallantyneLanguage: English
- Over the Side: Captains All, Book 6.Author: W. W. (William Wymark) Jacobs, Will OwenLanguage: English
- Over the SliprailsAuthor: Henry LawsonLanguage: English
- Over the TeacupsAuthor: Oliver Wendell HolmesLanguage: English
- Over the Top With the Third Australian DivisionAuthor: G. P. (George Percival) Cuttriss, Monash, John, Sir, Neil McBeathLanguage: English
- Over There: War Scenes on the Western FrontAuthor: Arnold BennettLanguage: English
- OverbeckAuthor: J. Beavington AtkinsonLanguage: English
- Overdue: The Story of a Missing ShipAuthor: Harry Collingwood, W. Herbert (William Herbert) HollowayLanguage: English
- Overland Red: A Romance of the Moonstone Cañon TrailAuthor: Henry Herbert Knibbs, Anton Otto FischerLanguage: English
- Overland through Asia; Pictures of Siberian, Chinese, and Tartar LifeAuthor: Thomas Wallace KnoxLanguage: English
- Overland: A NovelAuthor: John William De ForestLanguage: English
- OverruledAuthor: Bernard ShawLanguage: English
- Owen Clancy's Happy Trail; Or, The Motor Wizard in CaliforniaAuthor: Burt L. StandishLanguage: English
- Owen Hartley; or, Ups and Downs: A Tale of Land and SeaAuthor: William Henry Giles KingstonLanguage: English
- Owindia : a true tale of the MacKenzie River Indians, North-West AmericaAuthor: Charlotte Selina BompasLanguage: English
- OxfordAuthor: Andrew LangLanguage: English
- OxfordAuthor: F. D. (Frederick Douglas) How, E. W. HaslehustLanguage: English
- Oxy-Acetylene Welding and Cutting: Electric, Forge and Thermit Welding together with related methods and materials used in metal working and the oxygen process for removal of carbonAuthor: Harold P. (Harold Phillips) ManlyLanguage: English
- Ozma of Oz: A Record of Her Adventures with Dorothy Gale of Kansas, the Yellow Hen, the Scarecrow, the Tin Woodman, Tiktok, the Cowardly Lion, and the Hungry Tiger; Besides Other Good People too Numerous to Mention Faithfully Recorded HereinAuthor: L. Frank (Lyman Frank) BaumLanguage: English
- Où va le monde?Author: Walther Rathenau, S. (Samuel) JankélévitchLanguage: French
- P'laski's Tunament: 1891Author: Thomas Nelson PageLanguage: English
- P.'s Correspondence (From "Mosses from an Old Manse")Author: Nathaniel HawthorneLanguage: English
- Paalaala sa mga MapagusapinAuthor: José RizalLanguage: Tagalog
- Paavo KontioAuthor: Eino LeinoLanguage: Finnish
- Paavo Nissinen: Kuvaelmia viimeisestä Suomen sodastaAuthor: G. H. (Gustaf Henrik) Mellin, Antti JalavaLanguage: Finnish
- Paddy FinnAuthor: William Henry Giles Kingston, Archibald WebbLanguage: English
- Padre Ignacio; Or, The Song of TemptationAuthor: Owen WisterLanguage: English
- Pag Susulatan nang Dalauang Binibini na si Urbana at ni FelizaAuthor: Modesto de CastroLanguage: Tagalog
- Pagan and Christian Creeds: Their Origin and MeaningAuthor: Edward CarpenterLanguage: English
- Pagan and Christian RomeAuthor: Rodolfo Amedeo LancianiLanguage: English
- Pagan PapersAuthor: Kenneth GrahameLanguage: English
- Pagan PassionsAuthor: Randall Garrett, Laurence M. Janifer, Robert StanleyLanguage: English
- PagesAuthor: Stéphane MallarméLanguage: French
- Pages for Laughing EyesAuthor: UnknownLanguage: English
- Pages from a Journal with Other PapersAuthor: William Hale WhiteLanguage: English
- Pages from an Old Volume of Life; A Collection of Essays, 1857-1881Author: Oliver Wendell HolmesLanguage: English
- Paginas SudamericanasAuthor: Phipps, HelenLanguage: Spanish
- Pahassa pulassa: Yksinäytöksinen huvinäytelmäAuthor: Robert KiljanderLanguage: Finnish
- Painted WindowsAuthor: Elia Wilkinson PeattieLanguage: English
- Painted Windows: Studies in Religious PersonalityAuthor: Harold Begbie, Kirsopp Lake, Emile VerpilleuxLanguage: English
- Painuva päivä; Elämän koreus; Leirivalkeat; Ajatar; Syreenien kukkiessaAuthor: Eino LeinoLanguage: Finnish
- Paisagens da China e do JapãoAuthor: Wenceslau de MoraesLanguage: Portuguese
- Pakolaisen päiväkirja: Sotatunnelmia vuosista 1848 ja 1849Author: Mór JókaiLanguage: Finnish
- PakolaisetAuthor: Johannes LinnankoskiLanguage: Finnish
- Palaces and Courts of the Exposition: A Handbook of the Architecture, Sculpture and Mural Paintings, with Special Reference to the SymbolismAuthor: Juliet Helena Lumbard JamesLanguage: English