- Over Here (English) by Guest, Edgar A. (Edgar Albert)
- Overland (English) by De Forest, J. W. (John William)
- Overland Red - A Romance of the Moonstone Cañon Trail (English) by Fischer, Anton
- Overland Red - A Romance of the Moonstone Cañon Trail (English) by Knibbs, Henry Herbert
- Overland through Asia; Pictures of Siberian, Chinese, and Tartar - Life (English) by Knox, Thomas Wallace
- Over literatuur - Critisch en didactisch (Dutch) by Campen, M. H. Van
- Over literatuur - Critisch en didactisch, tweede bundel (Dutch) by Campen, M. H. Van
- Over Paradise Ridge - A Romance (English) by Daviess, Maria Thompson
- Over Prairie Trails (English) by Grove, Frederick Philip
- Overruled (English) by Shaw, George Bernard
- Over Strand and Field (English) by Flaubert, Gustave
- Over the Border: Acadia, the Home of "Evangeline" (English) by Chase, Eliza B. (Eliza Brown)
- Over the Pass (English) by Palmer, Frederick
- Over There (English) by Bennett, Arnold
- Over the Side - Captains All, Book 6. (English) by Jacobs, W. W.
- Over the Sliprails (English) by Lawson, Henry
- Over the Teacups (English) by Holmes, Oliver Wendell
- Over the Top (English) by Empey, Arthur Guy
- Over the Top With the Third Australian Division (English) by Cuttriss, G. P.
- Over the Top With the Third Australian Division (English) by McBeath, Neil
- Owindia : a true tale of the MacKenzie River Indians, North-West America (English) by Bompas, Charlotte Selina
- Oxford (English) by Lang, Andrew
- The Oxford Movement - Twelve Years, 1833-1845 (English) by Church, R.W.
- 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 carbon (English) by Manly, Harold P.
- Ozma of Oz (English) by Baum, L. Frank (Lyman Frank)
- Paalaala sa mga Mapagusapin (Tagalog) by Rizal, José
- Paavo Kontio (Finnish) by Leino, Eino
- Le péché de Monsieur Antoine, Tome 1 (French) by Sand, George
- Le péché de Monsieur Antoine, Tome 2 (French) by Sand, George
- The Pacha of Many Tales (English) by Marryat, Frederick
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