- O diário de Rywka
- O político
- Objects In the House
- Octavio Paz
- Oddballs
- ODYSSEY
- 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 Champions
- 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 Top of Glass
- On Top of Glass
- One Direction: A Year with One Direction
- One Direction: Behind the Scenes
- One Direction: Meet One Direction
- Only a Boy Named David
- Opening My Eyes Underwater
- Oprah Winfrey
- 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 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
- Os meninos de Jo
- Os ossos do ofício
- Os Quitutes
- Oscar Peterson
- Otello Marilli
- Other Boys
- Otra Luz
- Our Community: O’Neill
- Our Stories, Our Voices
- Our Story Begins
- Our World
- Out of Hiding: A Holocaust Survivor’s Journey to America (With a Foreword by Alan Gratz)
- Out of The Blue, Young Reader's Edition