Books about Fiction (sorted alphabetically)
- Once Aboard the Lugger-- The History of George and his Mary A. S. M. Hutchinson
- Once to Every Man Larry Evans
- Once Upon A Time Richard Harding Davis
- Onder de Mooren: Avontuurlijke reizen door alle werelddeelen (Dutch) J. Hendrik van Balen
- One Day
- One Day's Courtship, and The Heralds of Fame Robert Barr
- One Maid's Mischief George Manville Fenn
- One of My Sons Anna Katharine Green
- One Of Them Charles James Lever
- Onnen orja (Finnish) Eino Leino
- On the Church Steps Sarah C. Hallowell
- On the Lightship Herman Knickerbocker Vielé
- On the Stairs Henry Blake Fuller
- Opal Serpent Fergus Hume
- Opening a Chestnut Burr Edward Payson Roe
- Open Question: A Tale of Two Temperaments Elizabeth Robins
- Options O. Henry
- Ordeal of Elizabeth Anonymous
- Orientations W. Somerset Maugham
- Original Penny Readings: A Series of Short Sketches George Manville Fenn
- Orphan Clarence Edward Mulford
- Oswald Langdon Levi Jackson Hamilton
- Other Fellow Francis Hopkinson Smith
- Other People's Business: The Romantic Career of the Practical Miss Dale Harriet L. Smith
- Other People's Money Emile Gaboriau