Authors: O
- Colleen Oakes2 books
- Lotus Oakes2 books
- Joyce Carol Oates7 books
- Constance O'Banyon6 books
- Takeshi Obata1 book
- William Oberfield4 books
- Patrick O'Brian1 book
- Kathleen O'Brien2 books
- Meghan O'Brien9 books
- Flann O'Brien1 book
- Anne O'Brien3 books
- Fitz-James O'Brien4 books
- Warren Ockrassa3 books
- Lorie O'Clare4 books
- Jennifer Barrett O'Connell2 books
- Carol O'Connell1 book
- George O'Connor4 books
- Jane O'Connor6 books
- Constance O'Day-Flannery5 books
- Mel Odom9 books
- Laurel O'Donnell1 book
- Elliott O'Donnell10 books
- Andrew J. Offutt2 books
- Jacqueline K. Ogburn2 books
- George W. Ogden2 books
- Elisabeth Ogilvie1 book
- Ellen Oh5 books
- Tracey O'Hara2 books
- Thomas J. O'Hara2 books
- Kate O'Hearn13 books
- Mónica Ojeda1 book
- Willa Okati2 books
- Janette Oke8 books
- Nnedi Okorafor1 book
- Chinelo Okparanta2 books
- Frances Jenkins Olcott3 books
- Daniel José Older5 books
- Ernest Oldmeadow2 books
- Ann O'Leary2 books
- Mrs. Oliphant5 books
- Margaret O. Oliphant3 books
- Jana Oliver2 books
- Jana G. Oliver2 books
- Lauren Oliver1 book
- Patricia Oliver3 books
- Gregg Olsen2 books
- Mark Andrew Olsen2 books
- Joseph Olshan4 books
- Melissa F Olson4 books
- Daniel O'Malley3 books
- Cynthia Jaynes Omololu2 books
- Katherine O'Neal2 books
- Robert O'Neill2 books
- Kay O'Neill1 book
- Oliver Onions5 books
- Kenneth Oppel6 books
- Edward Phillips Oppenheim2 books
- E. Phillips Oppenheim10 books
- Oliver Optic9 books
- Nande Orcel2 books
- Emma Orczy1 book
- Baroness Emma Orczy4 books
- Mary Pope Osborne56 books
- Maggie Osborne7 books
- Lloyd Osbourne3 books
- Alice Oseman3 books
- Michelle Osgood2 books
- Pat O'Shea1 book
- M.J. O'Shea3 books
- T. J. O'Shea2 books
- Mark Oshiro3 books
- Lee Knox Ostertag4 books
- Micol Ostow2 books
- Katie O'Sullivan2 books
- Vincent O'Sullivan2 books
- James Otis9 books
- Ouida2 books
- Orland Outland2 books
- Ovid1 book
- 44 Ovid3 books
- Chris Owen6 books
- Margaret Owen2 books
- James A. Owen3 books
- Wanda Owen2 books
- Robin D. Owens13 books
- Zahra Owens2 books
- J. Macdonald Oxley2 books
- Helen Oyeyemi4 books
- Yei Theodora Ozaki3 books