- Otter: I Love Books!
- Otter: Let's Go Swimming!
- Otter: Oh No, Bath Time!
- Otter: The Best Job Ever!
- Otter: What Pet Is Best?
- Otto the Owl Who Loved Poetry
- Our Australian Girl: Pearlie the Spy (Book 3)
- Our Australian Girl: Pearlie's Ghost (Book 4)
- Our Australian Girl: Pearlie's Pet Rescue (Book 2)
- Our Australian Girl: Poppy at Summerhill (Book 2)
- Our Australian Girl: The Pearlie Stories
- Our Australian Girl: The Rose Stories
- Our Australian Girl: The Rose Stories
- Our Australian Girl: The Ruby Stories
- Our Beautiful Game
- Our Colourful Cookies
- Out and About
- Out of Bounds
- Out of the Ballpark
- Out of the Hitler Time trilogy: When Hitler Stole Pink Rabbit, Bombs on Aunt Dainty, A Small Person ...
- Out On A Limb
- Out!
- Owen and Eleanor Make Things Up
- Owen and Eleanor Move In
- Owl & Friends
- Owl and the Lost Boy
- Owl at Home
- Owly & Wormy, Bright Lights and Starry Nights
- Owly & Wormy, Friends All Aflutter!
- Own Your Period
- 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