- Outback All-Stars (Race the Wild #5)
- Outback Alphabet
- Outback Outlaw
- Outback Songs
- Outbreak
- Outcast of Redwall
- Outer Space Bedtime Race
- Outfoxed
- Outing to The Old Oak Theatre
- Outlaw
- Outlaws
- Outlaws of Time #2: The Song of Glory and Ghost
- Outlaws of Time: The Legend of Sam Miracle
- Outo juttu
- Outpost
- Outside Art
- Outside Inside Outside
- Outside Is Always Best
- Outside My Bedroom Walls
- Outside My Window
- Outside Shot
- Outside the Box
- Outside the Box: Teams
- Oven Chips For Tea
- Over and Under the Snow
- Over draken en een heks
- Over eendjes en andere vogels
- Over goden en reuzen
- Over in a River
- Over in Australia
- Over in the Arctic
- Over in the Forest
- Over is Out
- Over on the Farm
- Over over morgen
- Over Sea Under Stone
- Over the Bridge of Light
- Over the Edge
- Over the Hills and Far Away
- Over the Moon
- Over the Moon You Go
- Over the River
- Over the River and Through the Wood
- Over the Top
- Over the Wall
- Over, Bear! Under, Where?
- Over-Scheduled Andrew
- Overboard and Out of this Realm
- Overcoming Acne
- Overcoming Fear
- Overfaldet på bopladsen
- Overlevernes by
- Overnight
- Overwatch – Die Heldin von Numbani
- Overwatch. L'eroe di Numbani
- Ovo Moje Malo Svetlo - Niki Ode u Svet
- Ovotástico
- Ovänner
- Ow! Ow, Cow!
- Owen and Eleanor Make Things Up
- Owen and Eleanor Meet the New Kid
- Owen and Eleanor Move In
- Owen and Mzee: A Little Story of Big Love
- Owen and Mzee: The True Story of a Remarkable Friendship
- Owen Y Mzee
- Owen's Family
- Owen’S Magic Backpack
- Owl & Friends
- Owl All Alone
- Owl and the Lost Boy
- Owl Diaries Collection (Books 1-5)
- Owl In My House
- Owl Who Paid Too Much Attention
- Owl's Adventures
- Owl, the Woodknots & the Old Oak Tree
- Owlboy: The Girl with the Destructo Touch
- OwlCat and Sharma Save the Day
- Owle, Chicken, Bear, Sparrow, and Stanley in Winter.
- Owlie and His Magic Music
- Owls are Good at Keeping Secrets
- Owly & Wormy, Bright Lights and Starry Nights
- Owly & Wormy, Friends All Aflutter!
- Owly Who
- Oxygen's Adventures
- Oye, Muro (Hey, Wall)
- Oyuncak Yiyen Canavar
- Oyuncaklı Ders
- Oz, the Complete Collection Volume 1 bind-up
- Oz, the Complete Collection Volume 2 bind-up
- Oz, the Complete Collection Volume 3 bind-up
- Oz, the Complete Collection Volume 4 bind-up
- Oz, the Complete Collection Volume 5 bind-up
- Oz-e and Limpy at the Breakfast Table
- Oz-e and Limpy – Bath and Bedtime
- Oz-e and Limpy – Let’s Be Friends
- Oz-e and Limpy – Time to Play
- Ozette's Destiny
- Ozette's Heartstone
- Atrapadas en el Escape Room (Ozkar & Family 1)
- Ozma de Oz
- Ozma Of Oz
- Ozma of Oz
- Ozma of Oz (Illustrated)
- Ozma von Oz - Die Oz-Bücher Band 3
- Ozoplaning with the Wizard of Oz
- Ozzie and the Art Contest
- Ozzie the Weighty Weiner Dog and the Weiner Dog Race
- Ozzy Onion and the Noisy Dinosaurs
- Ozzy the Down Under Reindeer: Adventures in the Red Centre
- Ozzy the Octopus Learns About Tingshas
- Où es-tu Yazid ?
- Où est FrouFrou?
- Où est Grand-père ?
- Où est Mulot ?