- Once Upon a Time in Connecticut (English) by Newton, Caroline Clifford
- On Christmas Day In The Evening (English) by Relyea, C. M. (Charles Mark)
- On Christmas Day In The Evening (English) by Richmond, Grace S. (Grace Smith)
- On Commando (English) by Van Warmelo, Dietlof
- On Compromise (English) by Morley, John
- On Conducting (Üeber Das Dirigiren) : a Treatise on Style in the Execution of Classical Music, (English) by Dannreuther, Edward
- On Conducting (Üeber Das Dirigiren) : a Treatise on Style in the Execution of Classical Music, (English) by Wagner, Richard
- De ondergang der Eerste Wareld (Dutch) by Bilderdijk, Willem
- Onder Moeders Vleugels (Dutch) by Alcott, Louisa May
- Onder Moeders Vleugels (Dutch) by Elberts, G. W.
- One Basket (English) by Ferber, Edna
- One Common Faith (English) by Baha'i International Community
- One Day - A sequel to 'Three Weeks' (English) by Anonymous
- One Day More - A Play In One Act (English) by Conrad, Joseph
- One Day's Courtship (English) by Barr, Robert
- One Divided By pi (to 1 million digits) () by Kanada, Yasumasa
- The One Great Reality (English) by Clayton, Louisa
- One Hundred Best Books (English) by Powys, John Cowper
- One Hundred Merrie And Delightsome Stories - Right Pleasaunte To Relate In All Goodly Companie By Way Of Joyance And Jollity (English) by Douglas, Robert B. (Robert Bruce)
- One Hundred Merrie And Delightsome Stories - Right Pleasaunte To Relate In All Goodly Companie By Way Of Joyance And Jollity (English) by Lebèque, Léon
- One Man in His Time (English) by Glasgow, Ellen Anderson Gholson
- One of Life's Slaves (English) by Lie, Jonas Lauritz Idemil
- One of Life's Slaves (English) by Muir, Jessie
- One of Our Conquerors — Complete (English) by Meredith, George
- One of Our Conquerors — Volume 1 (English) by Meredith, George
- One of Our Conquerors — Volume 2 (English) by Meredith, George
- One of Our Conquerors — Volume 3 (English) by Meredith, George
- One of Our Conquerors — Volume 4 (English) by Meredith, George
- One of Our Conquerors — Volume 5 (English) by Meredith, George
- One of Ours (English) by Cather, Willa Sibert
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