It’s time for our favorite countdown of the year — the books that teachers taught the most in 2021.

We compiled the results by looking back at the most popular book lists on, assigned over the past year by thousands of middle and high school teachers from across the map. Teachers are using these ready-made resources to create engaging instructional activities that teach their students the most relevant vocabulary words from the texts.

Some are classics, and some are contemporary titles that have recently gained popularity with students and teachers. We'll be back at the end of 2022 to see which books stay on top, and which new titles gain ground in your classrooms.

Top 10 Titles Assigned by Middle School Teachers

1. The Outsiders 6. Hatchet
2. The Giver 7. The Lightning Thief
3. The Watsons Go to Birmingham 8. Number the Stars
4. Freak the Mighty 9. The Diary of Anne Frank
5. A Long Walk to Water 10. The Boy in the Striped Pajamas

Explore the entire collection of the top 25 middle grade titles.

Top 10 Titles Assigned by High School Teachers

1. Romeo and Juliet 6. Night
2. The Great Gatsby 7. Animal Farm
3. The Crucible 8. The Outsiders
4. To Kill a Mockingbird 9. Lord of the Flies
5. Of Mice and Men 10. The Tragedy of Macbeth

Explore the entire collection of the top 25 high school titles.

Which of these titles are on your class reading list?

No matter what you're teaching, can help you prep your students for a better reading experience. Start with one of our ready-made lists, and in just a few clicks you can assign meaningful activities that will boost comprehension. Whether you create a practice assignment, a spelling bee, or one of our famous Vocab Jams, our lists and activities will engage students and teach them the words they need to know to be successful readers. Here's how to get started.