- Observando el tiempo
- Observing Animal Opposites
- Obsession
- Obsidiáni (Oliver Blue a Škola pro Vidoucí—Kniha třetí)
- Obst- und Gemüsegeschichten
- Obři a Trpaslíci
- Obři a Trpaslíci. Vol.2
- Obři a Trpaslíci. Vol.3
- Obři a Trpaslíci. Vol.3
- Obři a Trpaslíci. Vol.4
- Occhio al gatto
- Occhio alla pelliccia, arriva il Grande Bzot!
- Occhiolina, Biocchiolina, Triocchiolina
- OCDaniel
- Ocean
- Ocean A Children's Encyclopedia
- Ocean Animal, Ninja, Hide and Seek
- Ocean Animals (Multilingual Board Book)
- Ocean Animals ABC Activity Book
- Ocean Animals from Head to Tail
- Ocean City - Tome 1 - Chaque seconde compte
- Ocean City - Tome 2 - Dans la cachette des rebelles
- Ocean City – Jede Sekunde zählt
- Ocean City – Stunde der Wahrheit
- Ocean Counting
- Ocean Currents and El Niño
- Ocean Fish School
- Ocean Friends
- Ocean Lullaby
- Ocean Maps
- Ocean Meets Sky
- Ocean Monsters
- Ocean of Blood
- Ocean Speaks
- Ocean Without End
- Ocean! Waves for All
- Oceanella
- Oceania T1 : la prophétie des oiseaux
- Oceania T2 : horizon blanc
- Oceanic Whitetip Sharks
- Oceans
- Oceans and Seas
- Oceans of Love
- Ociee and Ben Nash, the Asheville Adventure
- Ockleberries to the Rescue
- Ocorrências Policiais
- Octave ne veut pas grandir
- Octavia, Tochter Roms – Gefahr in Germanien (Octavia, Tochter Roms 1)
- Octavio The Octopus Follows His Dream
- Octavius O'Malley And The Mystery Of The Criminal Cats
- Octavius O'Malley And The Mystery Of The Exploding Cheese
- Octavius O'Malley And The Mystery Of The Missing Mouse
- Octavo a deux maisons
- Octi Gets a Shot
- Octie Octopus and the Ocean Adventure
- Octo-Man and the Headless Monster #1
- Octo-Mommy
- October Mornings in Salem, Massachusetts
- October, October
- Octobre un crime
- Octopus Egg
- Octopus Encounter
- Octopus Escapes!
- Octopus Shocktopus!
- Octopus!
- Octopus' Odd Object
- Octopuses
- Octopuses For Kids
- Octopuses One to Ten
- Octopuses: Eight Armed Wonders: Educational Version
- Océane Lachance - tome 1
- Od morza do morza
- Odamı Temiz Tutmayı Çok Severim
- Odd and the Frost Giants
- Odd Dog
- Odd Dog Out
- Odd e il Gigante di Ghiaccio
- Odd One Out
- Odd e il Gigante di Ghiaccio
- Odd One Out
- Odd One Out (Readaloud)
- Odd One Out US Ed (Readaloud)
- Odd Owls & Stout Pigs
- Odd! Birds
- Oddbird
- Oddfellow's Orphanage
- Oddity
- Odds on Oliver
- Ode to the Peanut Butter Sandwich
- Odeio aula remota
- Odello und der entführte Weihnachtsmann
- Odessa
- Odessa Again
- Odete e Osmar
- Odette s'en va-t-en guerre
- Odie and the New Cats
- Odie Needs A New Home!
- Odie the Stray Kitten
- Odie's Best Friend
- Odil and the Dragon
- Odile and the pelican - Odile et le pélican
- Odilon le papillon
- Odin får en lama, Læs lydret 2
- Odin får nok, Grøn læseklub
- Odin ser en dæmon, Læs lydret 2
- Odin's Ravens
- Odin, Dog Hero of the Fires
- Odio el Rosa 3: Historia de Alan
- Odio el Rosa Historia de Dani 1
- Odio el Rosa Historia de Sara 1
- Odio i lunedì
- Odissea
- Odissea. I viaggi di Ulisse.
- Odissea. Le avventure di Ulisse.
- Odisseia de Homero (segundo João Vítor)
- Odisseia Olímpica