The American Library Association condemns censorship and works to ensure free access to information. Every year, the Office for Intellectual Freedom (OIF) compiles a list of the Top 10 Most Challenged Books in order to inform the public about censorship in libraries and schools. The lists are based on information from media stories and voluntary reports sent to OIF from communities across the U.S. The Top 10 lists are only a snapshot of book challenges. Surveys indicate that 82-97% of book challenges – documented requests to remove materials from schools or libraries – remain unreported and receive no media. To read about the reasons why one person or group thought a book should be banned, see Frequently Challenged Books Top 10 Lists. This page covers details for 2001-2020 with background information for 2000-2009.
Top 100 Most Banned and Challenged Books: 2010-2019; Top 100 Banned/Challenged Books: 2000-2009; 100 most frequently challenged books: 1990-1999 Office for Intellectual Freedom (OIF) has only been collecting data about banned books since 1990, so they do not have any lists of frequently challenged books or authors before that date.
The Absolutely True Diary of a Part-Time Indian by 
(TIE) A Court of Mist and Fury by 
(TIE) Crank by 
(TIE) Me and Earl and the Dying Girl (Movie Tie-In Edition) by 
George by 
A Day in the Life of Marlon Bundo by 
The Adventures of Captain Underpants by 
Skippyjon Jones by 
The Absolutely True Diary of a Part-Time Indian by 
This Day in June by 
Two Boys Kissing by The Absolutely True Diary of a Part-Time Indian by 
And Tango Makes Three by 
It's Perfectly Normal by 
A Stolen Life by The ALA Office for Intellectual Freedom tracked 729 challenges to library, school, and university materials and services in 2021. Of the 1597 books that were targeted, here are the most challenged, along with the reasons cited for censoring the books:
The Absolutely True Diary of a Part-Time Indian by Me and Earl and the Dying Girl (Movie Tie-In Edition) by The Absolutely True Diary of a Part-Time Indian by George by 
Sex Is a Funny Word by And Tango Makes Three by 
I Am Jazz by The Absolutely True Diary of a Part-Time Indian by The Adventures of Captain Underpants by 
A Bad Boy Can Be Good for a Girl by 
Bless Me, Ultima by 
Bone Volume 1 Out from Boneville by 
Fifty Shades of Grey by George by The Absolutely True Diary of a Part-Time Indian by 
Something Happened in Our Town by George by I Am Jazz by 
Two Boys Kissing by 
Big Hard Sex Criminals by 
Make Something Up by 
The Meanest Thing to Say by 
Eleanor and Park by These titles may not have made the Top Ten lists, but they have still been challenged many times over the years for various reasons.
George by 
Beyond Magenta by Sex Is a Funny Word by I Am Jazz by And Tango Makes Three by Beyond Magenta by 
The Curious Incident of the Dog in the Night-Time by Fifty Shades of Grey by 
Habibi by I Am Jazz by 
Nasreen's Secret School by Two Boys Kissing by 
