- O arrependimento
- O banho de cores
- O calcanhar do Aquiles
- O castelo da bruxa confusa
- O circo das formas
- O Corcunda de Notre-Dame em cordel
- O dinheiro
- O gigante preguiçoso
- O guarda
- O impari il furlan
- O IS FOR OCEAN
- O is for Octopus
- O is for Oklahoma
- O is for... Oliver the Oviraptor
- O joelho Juvenal
- O livro das palavras
- O Livro dos Rapazes
- O mundo mágico dos números
- O mundo num segundo
- O olfato do rato
- O paladar do urso polar
- O Pequeno Livro dos Números: Vol. 1
- O Pequeno Livro dos Números: Vol. 2
- O Pequeno Livro dos Números: Vol. 3
- O Pequeno Livro dos Números: Vol. 4
- O pezinho feio
- O pintor e a ponte
- O ponto e a vírgula
- O porco mais elegante do mundo
- O rei das palavras
- O sonho de Dam-Dam e do sr. Gom-Gom
- O tato do gato
- O tempo das cores
- O tupi que você fala
- O'Contraire
- O1
- O2
- OBI-123
- Obligations Morales et Juridiques
- Observing Animal Opposites
- Ocean Animals
- Ocean Animals (Multilingual Board Book)
- Ocean Counting
- Octopus' Odd Object
- Octopuses One to Ten
- Oeuf & Jambon: Tomber dans les pommes
- Oeuf et Jambon : La reine des rennes !
- Offre et Acceptation
- Oggie the Otter
- Oh Little Garden Girl
- Oh No! Shark in the Snow!
- Oh Say You Can Say
- Old MacDonald Had a . . . Zoo?
- Old MacDonald Had a Farm
- Olha o passarinho!
- Oliver Otter's Own Office
- Olivia's ABC
- Olivia's Potty Training Book
- Olivia's Tower
- Olivia’s ABC Book
- Omar Otto's Occupation
- On a Cold Day
- On a Hot Day
- On a Rainy Day
- On a Slippery Slope
- On a trip
- On a Walk with Ren
- On Market Street
- On My Stoop
- On range ! - Petite histoire pédagogie Montessori - Dès 3 ans
- On the First Day of Kindergarten
- On the Job Teachers: Time
- On the Job: Teachers: Time: Read-along ebook
- On the Job: Vet Comparing Groups
- On the Job: Vet: Comparing Groups: Read-along ebook
- On the Move: Mass Migrations
- On the Road with Rose and Bose
- Once Upon a Winter Day
- Onde Está A Verdade?
- One 1 Foot Two 2 foot Left Foot Right Foot
- One Big Pair of Underwear
- One Bright Ring
- One Clucky Hen
- One Cold Autumn Day
- One Dark Bird
- One Family
- One Fish, Two Fish, Red Fish, Blue Fish
- One Foot, Two Feet
- One Fox
- One Golden Rule at School
- One Hundred Hungry Ants
- One Hundred Shoes
- One Hundred Things to Spot
- One Is a Drummer
- One Is a Lot (Except When It's Not)
- One Is a Piñata
- One is Not a Pair
- One Leaf, Two Leaves, Count with Me!
- One Little Lot
- One Little Monster
- One Little Piggy: Counting Books for Toddlers
- One Naked Baby
- One Potato, Two Potato
- One Proud Penny
- One Some Many
- One Tractor
- One Two That's My Shoe
- ONE Very Big Bear
- One Very Tired Wombat
- One White Rabbit: A Counting Book
- One Yellow Sun
- One, Two, Buckle My Shoe
- One, Two, Three
- Onka Yoruba: My First Naija Numbers
- Oops! I Made A Mistake, Level 1
- Oops, Pounce, Quick, Run!
- Open Wide
- Open Your Eyes
- Operació biquini
- Operación bikini
- Operation Josh Taylor
- Opportunity Costs
- Opposites
- Opposites at School/ Les contraires à l'école
- Opposites For Kids
- Opposites from Parenting Magazine
- Opposites With Ria
- Opposites! And the Life Lessons They Teach Us
- Oppositeville
- OR WOULD YOU RATHER BE ...
- Orange
- Orange Porange
- Orange You Glad: A Preschool Early Learning Colors Picture Book
- Orangey the Goldfish: ABC's With Orangey and Friends
- Orez Invents a New Number