- Starting School / Changing Schools
- Top Children's Books About Starting School or Changing Grades/Schools
- Little School
- I Am Too Absolutely Small for School
- Sam and Gram and the First Day of School
- First Grade Stinks!
- First Grade Jitters
- First Day Jitters
- The Skinny on Bullying
- A Smart Girl's Guide to Staying Home Alone
- Library Card Sign-up Month
- Save Money at Your Public Library
- Tomás and the Library Lady
- The Librarian of Basra: A True Story of Iraq
- The Boy Who Was Raised by Librarians
- Roald Dahl Month
- The Enduring Roald Dahl
- September 5 - Birthday of Author and Poet Paul Fleischman
- Poetry Books With Poems for Two or More Voices
- September 6 - Birth Date of Jane Addams, Winner of the 1931 Nobel Peace Prize
- The Jane Addams Children's Book Awards
- September 8 - Birthday of Poet Jack Prelutsky
- The Frogs Wore Red Suspenders
- Read A Rhyme, Write A Rhyme
- Good Sports: rhymes about running, jumping, throwing and more
- September 8 - Birthday of Author and Books for Boys Advocate Jon Scieszka
- An Interview with Children’s Author Jon Scieszka
- Spotlight on Author Jon Scieszka
- September 9 - Grandparents' Day
- Grandparents!
- September 11 - Patriot Day: Remembering September 11, 2001
- September 11, 2001: Attack on New York City
- This Place I Know: Poems of Comfort
- September 13 - Roald Dahl Day and the Anniversary of the Birth of Roald Dahl
- The Enduring Roald Dahl
- September 15 - Birth Date of Robert McCloskey
- Maine Caldecott Winners by Robert McCloskey
- September 15 - October 15 - National Hispanic Heritage Month
- Hispanic and Latino Heritage in Books for Children and Teens
- The Pura Belpré Award for Latino and Latina Authors and Illustrators
- The Storyteller's Candle / La velita de los cuentos
- Los Gatos Black on Halloween
- Book Fiesta! Celebrate Children's Day / Book Day - Celebremos El dia de los niños / El da de los libros
- Children's Books About the Day of the Dead / El Dia Los Muertos
- Love to Mamá: A Tribute to Mothers
- September 15 - Birthday of Author and Illustrator Tomie dePaola
- The Extraordinary Tomie dePaola
- Oliver Button is a Sissy
- Patrick, Patron Saint of Ireland
- September 16 - Anniversary of the Birth of H.A. Rey
- The Journey That Saved Curious George: The True Wartime Escape of Margret and H. A. Rey
- The Complete Adventures of Curious George
- September 17 - Constitution Day and Citizenship Day
- Children's Books about the Political Process / Elections / Voting
- Children's Books that Celebrate America, the Constitution and More
September 17-23 - Constitution Week
- September 22 - First Day of Autumn / Fall
- Peepers
- September 24 - National Punctuation Day
- Eats, Shoots & Leaves: Why, Commas Really Do Make A Difference!
- September 25, 1963 - Birthday of Author Andrea Davis Pinkney
- Let It Shine: Stories of Black Women Freedom Fighters
- September 30 - Anniversary of the Birth of Edgar Parin d'Aulaire
- D'Aulaires' Book of Greek Myths
- September 30 − October 6 - Banned Books Week - Celebrating the Freedom to Read
- Banned Books Week FAQs: What You Need to Know About Banned Books Week
- Banning and Censorship of Children's Books
- Harry Potter: The Censorship Battles
