- Others, Just Like Me
- Otherworld Chronicles: The Invisible Tower
- Otherworlds - Tome 1
- Otis and The Kittens
- Otis and the Scarecrow
- Otis and the Tornado
- Otis and Will Discover the Deep
- Otis Dooda
- Otis Dooda: Downright Dangerous
- Otis Gives Thanks
- Otis the Owl
- Otis's Busy Day
- Otis, el búho
- Oto jest Kasia
- Otter and Owl and the Big Ah-choo!
- Otter and Owl Say I'm Sorry
- Otter and Owl Set Sail
- Otter and Owl's Helpful Hike
- Otter Chaos - The Dam Busters
- Otter Chaos!
- Otter Out of Water
- Otter Pups
- Otter Tales
- Otter Tales Volume II
- Otter This World
- Otter This World Read-Along
- Otter: Best Cake Ever
- Otter: Hello, Sea Friends!
- Otter: Let's Go Swimming!
- Otter: The Best Job Ever!
- Otterman Island - Buried Treasure
- Otters For Kids
- Otters' Moon
- Otterwill Book 3: Tales of Tossledowns
- Otto
- Otto and the New Girl
- Otto of the Silver Hand
- Otto P. Nudd
- Otto Tattercoat and the Forest of Lost Things
- Otto the Book Bear
- Otto the Owl Who Loved Poetry
- Otto's Backwards Day
- Otto's Orange Day
- Otto: A Palindrama
- Ouch in the Pouch
- Ouch Mean Stops
- Ouch! "Jack and Jill"
- Ouch: Tales of Gravity
- Ouchiwahwah!
- Oui Love Animals
- Oui Love Colors
- Oui Love Cuisine
- Ouille! Ça fait mal
- Ouistiti a disparu !
- Oupa is hemel toe
- Oups ! J'ai effacé la prof
- Oups, Pierre change de métier !
- Our Amazing Sun
- Our Animal Neighbors
- Our Auntie (“Tee-Tee”) Uses a Chair with Wheels