- O.W. Gurley
- Ocean Speaks
- Of Thee I Sing: Read & Listen Edition
- Old Dog Tray: Stephen Foster and His Dogs
- Old Hickory:Andrew Jackson and the American People
- Olga Korbut: Gymnastics Trailblazer
- Omero era un figo
- On a Beam of Light
- On Our Way to Oyster Bay
- On the Court with ... Kobe Bryant
- On the Court with ... Shaquille O'Neal
- On the Court with...Venus and Serena Williams
- On the field with ... Alex Rodriguez
- On the Field with...Peyton and Eli Manning
- On the Field with...Peyton and Eli Manning
- On the Halfpipe with...Tony Hawk
- On the Job Filmmakers: Adding and Subtracting Mixed Numbers
- On the Job: Filmmakers: Adding and Subtracting Mixed Numbers: Read-along ebook
- On the Track with...Jeff Gordon
- On Wings of Words
- One Direction: The Official Annual 2014
- One Direction: The Official Annual 2015
- One Direction: The Official Annual 2016
- One Hundred Reasons To Hope
- One Hundred Steps: The Story of Captain Sir Tom Moore
- One Life: Young Readers Edition
- One Step Further
- Only Margaret
- Opal Lee and What It Means to Be Free
- Opening the Road
- Oscar Peterson
- Otis and Will Discover the Deep
- Our House Is on Fire
- Our Little Heroes / Nuestros pequeños héroes (Bilingual)
- Our Little Mushroom
- Our World
- Out of The Blue, Young Reader's Edition
- Out of the Shadows
- Out of the Woods
- Overview of the Korean War