- O céu azul de Giotto
- O jardim da infância de Matisse
- O segredo de Magritte
- O tro sai gon
- Odd Numbers
- Off We Go!
- Ogres Awake!
- Oh Christmas Tree Chris Cross
- Oil and Pipelines
- Old Penn Station
- Olha o passarinho!
- On The Go
- On the Job Filmmakers: Adding and Subtracting Mixed Numbers
- On the Job Photographer: Place Value
- On the Job: Filmmakers: Adding and Subtracting Mixed Numbers: Read-along ebook
- On the Job: Photographer: Place Value: Read-along ebook
- On the Job: Podcast Producer: Multiplication: Read-along ebook
- Once Around the Sun
- Once Upon a Dinosaur Craft
- Once Upon a Fairy Tale Craft
- Once Upon a Medieval Craft
- Once Upon a Pirate Craft
- Once Upon a Robots and Aliens Craft
- Once Upon an Animal Craft
- One Direction. La historia
- One Direction: Straight to the Top!
- One, Two, Three... Little Songs
- Operas Every Child Should Know
- Opioid Crisis
- Organic Crafts