- Orchard Books
- Orchard Classics
- Orchard Myths
- Orchard Paperbacks
- Orchard Picturebooks
- Ordinary Terrible Things
- Orejitas/ Little Ears
- Orell Füssli Kinderbuch
- Organic Baby
- Organic Reactions
- Orig Title: Something from Nothing
- Origami Adventures
- Origami Girl
- Origami Yoda Books
- Orion Children's Books
- Orphan Train Adventures
- Orphan Train Series
- Orphan's Journey
- Orphans Journey
- Orphen
- Osh Kosh
- Osprey Title S.
- Oswald
- Other America
- Other Half of History
- Other Voice in Early Modern Europe (Hardcover)
- Otherworld Chronicles
- Otto Undercover
- Our Amazing Continents
- Our Amazing World Series
- Our America
- Our Bodies
- Our Body
- Our Changing World
- Our Changing World--The Timeline Library (Series).
- Our Country's Holidays
- Our Country's Holidays/las Fiestas De Nuestra Nacion
- Our Emotions & Behaviour
- Our Environment
- Our Global Community
- Our Government
- Our KidsPak
- Our Lives, Our World
- Our Living World
- Our Neighborhood
- Our Physical World
- Our Planet in Peril
- Our Solar System
- Our Universe
- Our Universe Series
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