- O burrinho Chico Chico
- O cavalo malhado
- O czym szumią wierzby
- O DESABAFO DOS ANIMAIS
- O Deserto do Sudoeste
- O gato do rabo comprido
- Turma da Mônica - O Grande Livro dos Dinossauros e Outros Animais Pré-Históricos
- O Grande Recife
- O is for Octopus
- O Lobo que mudou o mundo
- O Maçarico Sarapico
- O Pacifico do Noroeste
- Ocean
- Ocean A Children's Encyclopedia
- Ocean Animals
- Ocean Animals (Multilingual Board Book)
- Ocean Animals from Head to Tail
- Ocean Counting
- Ocean Friends
- Oceans
- Octopuses For Kids
- Octopuses One to Ten
- Octopuses: Eight Armed Wonders: Educational Version
- Odd Dog
- Odile and the pelican - Odile et le pélican
- Oh Candy!
- Oh Say Can You Say Di-no-saur? All About Dinosaurs
- Oh, the Pets You Can Get!
- Oi Aardvark!
- Oi Cat!
- Oi Dog!
- Oi Duck-billed Platypus!
- Ojos de animales
- Ojos de animales
- Old Dog Tray: Stephen Foster and His Dogs
- Olga the Brolga
- Oliver for Young Readers
- Olivia Nibblesqueak's Messy Mischief
- Olivia the Spy
- Oltre L'Arcobaleno
- OMAR the Discontented Cat
- On a des soucis
- On a Farm
- On Beyond Bugs! All About Insects
- On The Farm
- On the Farm
- On The Farm
- On the Job Dog Walkers: Data
- On the Job: Dog Walkers: Data: Read-along ebook
- On the Job: Vet Comparing Groups
- On the Job: Vet: Comparing Groups: Read-along ebook
- Once upon a Mastodon: All About Prehistoric Mammals
- Once Upon an Elephant
- One Fun Day In The Australian Bush
- One Happy Chicken
- One Hot Penguin
- One Moon for All. Book 2. Tosha's Vacation
- One Moon for All. Book 3.Friendship of Tosha and Break
- One Turtle's Last Straw
- Oona
- Oprah & Stedman's Zoo Adventure
- Orangey the Goldfish
- Orangey the Goldfish: ABC's With Orangey and Friends
- Orangey the Goldfish: Meet the New Puppy (Book 5)
- Orangey the Goldfish: Orangey Goes to School (Book 4)
- Orangutans For Kids
- Orca - Killer Whale
- Orca Calves
- Orca Killer Whale
- Orca Rescue!
- Origami Farm
- Os três porquinhos e a bruxa Clotilde
- Oscar der Ballonfahrer entdeckt die Tiere des Teiches!
- Oscar der Ballonfahrer – Hotte von Hüh ist ein Pferd
- Oscar the Hungry Unicorn
- Oscura luz del monte
- Ostriches: Flightless Birds of Wonder: Educational Version
- Otis the Owl
- Otis, el búho
- Otter Chaos - The Dam Busters
- Otter Chaos!
- Otters For Kids
- Otters' Moon
- Otto the Book Bear
- Our Animal Neighbors
- Our Bluebird Family
- Our Dogs, Ourselves -- Young Readers Edition
- Our Feathered Friends
- Our Planet
- Out of Sight Till Tonight! All About Nocturnal Animals
- Outback Pets
- Outrageous Animals
- Owl All Alone
- Owls (Read it book for Children 4 to 8 years)
- Owls For Kids: Amazing Animal Books For Young Readers
- Owls Photos and Fun Facts for Kids
- Owls: For tablet devices