- O aniversário da Macaca
- O Camelo, o Burro e a água
- O Canário Não Comia
- O diário do Sr. Moreno, Alto e Belo
- O Elefante em Apuros
- O Gato Michín
- O Gato, o Porco e a porcaria
- O livro das palavras
- O Livro de histórias do Natal
- O Lobo Maurinho
- O Menino Longínquo
- O Meu Monstro 4 - Iniciação à Leitura - para crianças dos 2 aos 5 anos de idade
- O Meu Monstro Palavras Visuais - Nível 2 Livro 6: Contar os Números
- O mistério da luz e a face das sombras
- O mistério do pau oco
- O nariz mágico de Joãozinho
- O passeio dos brinquedos
- O Pequeno Carro de Bombeiros Vermelho
- O pezinho feio
- O ponto e a vírgula
- O Segredo - Livro 3: Poder da Mente
- O Segredo - Mente Màgica: Livro Um
- O segredo do disco perdido
- O Segredo Livro 2 A descoberta
- Obaa of the Green Planet 1
- Objects and Materials
- Ocean Currents and El Niño
- Ocean Maps
- Ocean Monsters
- Oceans
- Octo-Man and the Headless Monster #1
- Odd One Out
- Odd One Out (Readaloud)
- Odd One Out US Ed (Readaloud)
- Odd! Birds
- Odete e Osmar
- Odile and the pelican - Odile et le pélican
- Off I Go!: An Acorn Book (Princess Truly #2)
- Off to Kindergarten
- Off to School
- Off to School (Readaloud)
- Off-Key
- Ogresse cherche prince charmant
- Oh Leo
- Oh No! My Shoe!
- Oh No! Look What the Cat Dragged In
- Oh No, The Leaves Are Moving!
- Oh, Baby! #3
- Oh, Mr. Sun
- Olaf und der gelbe Vogel
- Old Friends, New Friends
- Old Mac Donald Had a Farm
- Old McDoggle Had a Zoo
- Old Mother Hubbard
- Old Possum's Book of Practical Cats
- Old Timer
- Olha o passarinho!
- Oliver and Charley -Supersenders
- Oliver's Moving Day
- Oliver’s Magic, Book 1: A Family Secret
- Olivia and the Giant
- Olles djur
- Ollie and Pookaberry in the Mushroom Forest
- Ollie Meets Ethan
- Ollie's Odyssey
- Oltre le nuvole
- Olympia the Games Fairy
- Om, Nom Nom
- Oma und Frieder – Jetzt schreien sie wieder
- Oma, ich kann deine Geschichten schon lesen
- Omar Pratt, On the Mat
- On a Cold Day
- On a Hill
- On a Hot Day
- On a Walk with Ren
- On Her Own
- On Ice: Exploring the Arctic with a Polar Bear Cub (#5)
- On Land
- On My Feet!
- On My Stoop
- On The Construction Site
- On The Day You Were Born
- On the Farm
- On The Farm For Kids
- On the Farm Read-Along
- On the Freedom Trail #4
- On the Go
- On the Ice
- On the Job
- On the Job Photographer: Place Value
- On the Job Podcast Producer: Multiplication
- On the Job Teachers: Time
- On the Job: Contractors Perimeter and Area