- O'Brien, Daniel
How to Fight Presidents, Your Presidential Fantasy Dream Team
- O'Brien, Phillips Payson
The Second Most Powerful Man in the World
- O'Brien, Timothy L.
The Lincoln Conspiracy
- O'Bryan, Tom
You Can Fix Your Brain
- O'Connell, Mark
To Be a Machine, Notes from an Apocalypse
- O'Connell, Robert L.
Revolutionary
- O'Connell, Vanessa
Wheelmen
- O'Connor, Flannery
Good Things Out of Nazareth
- O'Connor, Jane
Nina, Nina Star Ballerina, Nina, Nina Ballerina
- O'Connor, Jim
Who Is Bob Dylan?
- O'Connor, Nuala
Becoming Belle
- O'Connor, Sandra Day
The Majesty of the Law, Out of Order
- O'Dell, Kathleen
Ophie Out of Oz
- O'Dell, Scott
Island of the Blue Dolphins, Island of the Blue Dolphins
- O'Dell, Tawni
Sister Mine
- O'Donnell, Ellen
Bless This Mess
- O'Donnell, Lawrence
Playing with Fire, Playing with Fire
- O'Donnell, Svenja
Inge's War
- O'Farrell, Maggie
Instructions for a Heatwave, I Am, I Am, I Am
- O'Gieblyn, Meghan
Interior States
- O'Hara, John
Appointment in Samarra, Ten North Frederick
- O'Hurley, John
It's Okay to Miss the Bed on the First Jump
- O'Keefe, Molly
Can't Buy Me Love, Can't Hurry Love
- O'Keefe Aptowicz, Cristin
Dr. Mutter's Marvels
- O'Leary, John
In Awe
- O'Mara, Margaret
The Code
- O'Nan, Stewart
Songs for the Missing, Henry, Himself
- O'Neal, Barbara
The Lost Recipe for Happiness
- O'Neal, Eilis
The False Princess
- O'Neal, Ryan
Both of Us
- O'Neil, Cathy
Weapons of Math Destruction
- O'Neill, Eric
Gray Day
- O'Neill, Gerard
Whitey
- O'Neill, Heather
The Lonely Hearts Hotel, The Lonely Hearts Hotel
- O'Neill, Joseph
Good Trouble, The Dog
- O'Reilly, Bill
Keep It Pithy, Who's Looking Out For You?
- O'Reilly, Finbarr
Shooting Ghosts, Shooting Ghosts
- O'Rourke, Meghan
The Long Goodbye
- O'Shaughnessy, Kate
The Lonely Heart of Maybelle Lane
- Oakes, Summer Rayne
How to Make a Plant Love You
- Oakley, Barbara
Mindshift
- Oakley, Colleen
You Were There Too
- Oates, Joyce Carol
Foxfire
- Obama, Barack
Change We Can Believe In, The Audacity of Hope
- Obama, Michelle
Becoming, Becoming
- Obama for Change,
Change We Can Believe In
- Obmascik, Mark
The Big Year
- Obreht , Téa
The Tiger's Wife, Inland
- Ockler, Sarah
Bittersweet, The Book of Broken Hearts
- Ockwell-Smith, Sarah
Ready, Set, Go!
- Odell, Jonathan
The Healing
- Offerman, Nick
Lincoln in the Bardo, Gumption
- Offill, Jenny
Weather
- Ofgang, Erik
The Good Vices
- Ofgang, Harry
The Good Vices
- Ogawa, Yoko
The Memory Police
- Ohlin, Alix
Dual Citizens
- Okorafor, Nnedi
From a Certain Point of View (Star Wars), From a Certain Point of View (Star Wars)
- Oksanen, Sofi
When the Doves Disappeared, Norma
- Olbermann, Keith
Trump is F*cking Crazy
- Older, Daniel José
Last Shot (Star Wars), Last Shot (Star Wars)
- Oliva, Alexandra
The Last One
- Oliveira, Robin
My Name Is Mary Sutter, Winter Sisters
- Oliver, Lauren
Delirium, Before I Fall
- Oliver, Lin
Hank Zipzer #1: Niagara Falls, Or Does It?, Hank Zipzer #4: The Zippity Zinger
- Oliver, Mary
Dog Songs
- Oller, John
White Shoe
- Olsen, Rena
The Girl Before, The Girl Before
- Olson, Lynne
Last Hope Island, Madame Fourcade's Secret War
- Olsson, Linda
A Sister in My House
- Omotoso, Yewande
The Woman Next Door
- Ondaatje, Michael
Warlight, Warlight
- Onwuachi, Kwame
Notes from a Young Black Chef
- Onyebuchi, Tochi
Crown of Thunder, War Girls
- Opdyke, Irene Gut
In My Hands: Memories of a Holocaust Rescuer
- Oppegaard, David
The Suicide Collectors
- Oppel, Kenneth
Inkling, Inkling
- Oppenheimer, Andres
The Robots Are Coming!
- Orange, Tommy
There There, There There
- Oren, Michael B.
Ally
- Orfalea, Paul
Copy This!
- Orlean, Susan
My Kind of Place
- Orloff, Judith
Emotional Freedom, Positive Energy
- Orloff, Judith
The Ecstasy of Surrender, The Power of Surrender
- Orlov, Melissa
Married to Distraction
- Orman, Suze
Women & Money (Revised and Updated), Suze Orman's 2009 Action Plan
- Ornish, Anne
Undo It!
- Ornish, Dean
Enjoy Every Sandwich, Undo It!
- Orr, Elaine Neil
Swimming Between Worlds
- Orringer, Julie
The Invisible Bridge, The Flight Portfolio
- Orsoni, Valerie
LeBootcamp Diet
- Orth, Maureen
Vulgar Favors
- Osborne, Lawrence
Only to Sleep, The Forgiven
- Osborne, Mary Pope
World at War, 1944, Polar Bears Past Bedtime
- Osborne, Steve
The Job
- Osbourne, Kelly
There Is No F*cking Secret
- Oshinsky, David
Bellevue, Bellevue
- Osho,
A Course in Meditation, Coming Home to Yourself
- Ostby, Anne
Pieces of Happiness, Pieces of Happiness
- Oster, Emily
Cribsheet
- Ostow, Micol
Westminster Abby
- Otheguy, Emma
The Madre de Aguas of Cuba
- Otsuka, Julie
When the Emperor Was Divine, The Buddha in the Attic
- Ovitz, Michael
Who Is Michael Ovitz?
- Owen, David
Where the Water Goes, Volume Control
- Owen, Lauren
The Quick
- Owen, Mark
No Hero, No Hero
- Owens, Delia
Where the Crawdads Sing, Where the Crawdads Sing
- Owens, Lisa
Not Working
- Owens, Michele L.
Silent Agreements
- Oyeyemi, Helen
Gingerbread, Gingerbread