- O diário de Rywka
- Objects In the House
- Octavio Paz
- Oddballs
- ODYSSEY
- Of Beetles and Angels
- Off The Porch
- Old Greek Stories
- Old Hickory:Andrew Jackson and the American People
- Old World Hero Stories - Volume I - Ancient Hero Stories
- Ole Evinrude and His Outboard Motor
- Oltre
- Oltre la linea - Viaggio nell'inferno del calcio giovanile
- Olympic Dream
- Olympic Sports - When and How? : History of Olympic Sports Then, Now And Beyond
- Olympic Sports For Kids : Amazing Sports for Children Of All Ages
- On the 28Th Day, My Eyes Opened
- On the Bike with...Lance Armstrong
- On the Court with ... Jennifer Capriati
- On the Court with ... Kobe Bryant
- On the Court with ... Shaquille O'Neal
- On the Court With... Hakeem Olajuwon
- On the Court with...Dwight Howard
- On the Court with...Kevin Durant
- On the Court with...LeBron James
- On the Court with...Stephen Curry
- On the Court with...Venus and Serena Williams
- On the field with ... Alex Rodriguez
- On the Field with ... Julie Foudy
- On the Field with ... Terrell Davis
- On the Field with...Derek Jeter
- On the Field with...Megan Rapinoe, Alex Morgan, Carli Lloyd, and Mallory Pugh
- On the Field with...Peyton and Eli Manning
- On the Field with...Tom Brady
- On the Halfpipe with...Tony Hawk
- On the Ice with...Mario Lemieux
- On the Ice with...Tara Lapinski
- On the Mound with ... Curt Schilling
- On the Track with...Jeff Gordon
- On Top of Glass
- Ona Judge Outwits the Washingtons
- One Direction
- One Direction
- One Direction: A Year with One Direction
- One Direction: Behind the Scenes
- One Direction: Dare to Dream
- One Direction: Meet One Direction
- One Direction: Our Story: Dare to Dream and Where We Are Collection
- One Direction: Where We Are
- One Peace
- One Real American
- Only a Boy Named David
- Opening My Eyes Underwater
- Oprah Winfrey
- Oprah Winfrey: Media Legend and Inspiration to Millions
- Optimism
- Orbit: Bill Gates: Co-Founder of Microsoft
- Orbit: Comic Creators: Stan Lee, Jerry Siegel, Joe Shuster, Jack Kirby & William M. Marston
- Orbit: George Lucas: Rise of an Empire
- Orbit: George R.R. Martin: The Power Behind the Throne
- Orbit: George Lucas: Rise of an Empire
- Orbit: George R.R. Martin: The Power Behind the Throne
- Orbit: George R.R. Martin: The Power Behind the Throne :Spanish Edition
- Orbit: Howard Schultz: The Man Behind STARBUCKS
- Orbit: Ian Fleming: The Man Behind James Bond
- Orbit: JRR Tolkien - The True Lord of the Rings
- Orbit: JRR Tolkien: Spanish Edition
- Orbit: Stan Lee: The Ultimate Avenger
- Orbit: Steve Jobs
- Ordinary Hazards
- Orlando, A Biography
- Orville and Wilbur Wright: Pioneers of the Age of Flight
- Os meninos de Jo
- Os ossos do ofício
- Os Quitutes
- Oscar Peterson
- Otello Marilli
- Other Boys
- Otra Luz
- Our Community: O’Neill
- Our Lives Matter
- Our Papa Is Santa, Too?
- Our Saviour
- Our Stories, Our Voices
- Our Story Begins
- Our World
- Out of Darkness
- Out of Hiding: A Holocaust Survivor’s Journey to America (With a Foreword by Alan Gratz)
- Out of The Blue, Young Reader's Edition