- O Artico
- O is for Oklahoma
- O.W. Gurley
- Odin, Dog Hero of the Fires
- Off to Plymouth Rock
- Oh, Canada!
- Oil and Pipelines
- Oil's Quest
- Olivia. El genio sinvergüenza (Olivia 1)
- Olivia. El zorro furioso (Olivia 2)
- On a Farm
- On Our Way to Oyster Bay
- On the Farm
- On the Walk Trail: Iron HorseTrail
- Once Around the Sun
- Once Upon a Fairy Tale Craft
- Once Upon a Full Moon
- One Day Luisito
- One Fine Evening
- One Hundred Reasons To Hope
- One Hundred Steps: The Story of Captain Sir Tom Moore
- One Moment in Time
- One Turtle's Last Straw
- One Vote, Two Votes, I Vote, You Vote
- One World, Many Colors
- Onika Wants to Help/ Onika Anataka Kusaidia
- Onka Yoruba: My First Naija Numbers
- Only You Can Be You
- Opal Lee and What It Means to Be Free
- Opening the Road
- Opioid Crisis
- Opposites