| The Absolutely True Diary of a Part-Time Indian | Sherman Alexie | Content regarding alcohol, bullying, violence; sexual references; profanity and slurs; allegations against the author | 2007 | 1 | — | — |
| Adventures of Huckleberry Finn | Mark Twain | Coarse language, racial stereotypes and use of the N-word | 1884 | 33 | 14 | 5 |
| The Adventures of Super Diaper Baby | Dav Pilkey | Encouraging poor spelling | 2002 | 41 | 47 | — |
| The Adventures of Tom Sawyer | Mark Twain | Coarse language, racial stereotypes | 1876 | — | — | 83 |
| Alice (series) | Phyllis Reynolds Naylor | Sexual content | 1985–2013 | 21 | 2 | 14 |
| All American Boys | Jason Reynolds and Brendan Kiely | Profanity, drug use, and alcoholism; thought to promote anti-police views, contain divisive topics, and be “too much of a sensitive matter right now”[10] | 2015 | — | — | — |
| All the King’s Men | Robert Penn Warren | Depicting a “depressing view of life” and “immoral situations” | 1946 | — | — | — |
| Almost Perfect | Brian Katcher | LGBT content | 2009 | 81 | — | — |
| Always Running | Luis J. Rodriguez | Gang violence, drug use and sexual references | 1993 | — | 68 | 85 |
| America | E. R. Frank | Sexual references, drug and alcohol use | 2002 | — | 100 | — |
| American Psycho | Bret Easton Ellis | Sexual references, violence toward women | 1991 | — | — | 53 |
| An American Tragedy | Theodore Dreiser | Sexual content, abortion, murder | 1925 | — | — | — |
| The Anarchist Cookbook | William Powell | Content related to the manufacturing of illicit narcotics and explosives | 1971 | — | — | 59 |
| Anastasia Krupnik (series) | Lois Lowry | References to beer, Playboy magazine, and suicide | 1979–1995 | — | 75 | 28 |
| And Tango Makes Three | Peter Parnell, Justin Richardson | Content regarding homosexuality and same-sex marriage | 2005 | 6 | 4 | — |
| Animal Farm | George Orwell | Political (Communist) commentary | 1945 | — | — | — |
| Anne Frank: Diary of a Young Girl | Anne Frank | Discussions of puberty and teenage sexuality | 1946 | 62 | — | — |
| Annie on My Mind | Nancy Garden | LGBT content | 1982 | — | — | 44 |
| Angus, Thongs and Full-Frontal Snogging | Louise Rennison | Crude language, sexual content, LGBT content | 1999 | — | 35 | — |
| Are You There God? It’s Me, Margaret. | Judy Blume | Content dealing with menstrual cycles and feminine hygiene | 1970 | — | 99 | 60 |
| The Arizona Kid | Ron Koertge | LGBT content | 1988 | — | — | 75 |
| Arming America: The Origins of a National Gun Culture | Michael A. Bellesiles | Content dealing with firearms, later proven to have been fabricated | 2000 | — | 38 | — |
| As I Lay Dying | William Faulkner | Dealing with issues of death; abortion | 1930 | — | — | — |
| Asking About Sex and Growing Up | Joanna Cole | Sexual education | 1988 | — | — | 57 |
| Athletic Shorts: Six Short Stories | Chris Crutcher | Content dealing with eating disorders, child abuse, racism, LGBT themes and AIDS | 1991 | — | 44 | 63 |
| The Awakening | Kate Chopin | Sexual content | 1899 | 82 | — | — |
| A Bad Boy Can Be Good For a Girl | Tanya Lee Stone | Crude language, sexual content, mature themes | 2006 | 44 | — | — |
| Bad Kitty (series) | Nick Bruel | Crude language[11] | 2005–2021 | 37 | — | — |
| Beloved | Toni Morrison | Themes regarding slavery and violence | 1987 | 45 | 26 | 45 |
| Beyond Magenta: Transgender Teens Speak Out | Susan Kuklin | Anti-family, offensive language, homosexuality, sex education, political viewpoint, religious viewpoint, unsuited for age group, and other (“wants to remove from collection to ward off complaints”) | 2014 | 27 | — | — |
| Big Hard Sex Criminals | Matt Fraction, illustrated by Chip Zdarsky | Sexually explicit | 2015 | — | — | — |
| Black Boy | Richard Wright | Themes of communism, sexual content, racism and atheism | 1946 | — | 81 | — |
| Bless Me, Ultima | Rudolfo Anaya | Profanity, crude language and violence | 1972 | 63 | 32 | 78 |
| Blood and Chocolate | Annette Curtis Klause | Sexual content; supernatural themes | 1997 | — | 57 | — |
| Blubber | Judy Blume | Content dealing with the issue of bullying | 1974 | — | 43 | 30 |
| The Bluest Eye | Toni Morrison | Themes of racism, incest and child sexual abuse | 1970 | 10 | 15 | 34 |
| Bone (series) | Jeff Smith | References to smoking, drinking and gambling | 1991–2004 | 16 | — | — |
| The Boy Who Lost His Face | Louis Sachar | Themes of the occult, sexuality and bullying; profanity | 1989 | — | 92 | 46 |
| Boys and Sex | Wardell Pomeroy | Sexual education | 1968 | — | — | 61 |
| Brave New World | Aldous Huxley | Anti-religion and anti-family themes, sexual content | 1931 | 26 | 36 | 54 |
| Brideshead Revisited | Evelyn Waugh | Themes of homosexuality, alcoholism, infidelity | 1945 | — | — | — |
| Bridge to Terabithia | Katherine Paterson | Allegations that the book promotes secular humanism, New Age religion, occultism, and Satanism | 1977 | — | 28 | 8 |
| Bumps in the Night | Harry Allard | Supernatural and occult themes, anti-family, encourages disobedience | 1979 | — | 93 | 56 |
| Burned | Ellen Hopkins | Supernatural and occult themes, anti-family, encourages disobedience | 2006 | 83 | — | — |
| The Call of the Wild | Jack London | Author’s pro-Socialism views | 1903 | — | — | — |
| Captain Underpants (series) | Dav Pilkey | Offensive language, unsuited for age group, violence | 1997–2015 | 2 | 13 | — |
| Carrie | Stephen King | Violence, anti-religious themes, sexual themes | 1974 | — | — | 81 |
| Cat’s Cradle | Kurt Vonnegut | Language, animal abuse, anti-religious themes, and scatological humor | 1963 | — | — | — |
| Catch-22 | Joseph Heller | Obscene language | 1961 | — | — | — |
| The Catcher in the Rye | J. D. Salinger | Offensive language, sexually explicit, unsuited to age group | 1951 | 49 | 19 | 10 |
| A Child Called “It” | Dave Pelzer | Child abuse | 1995 | 36 | — | — |
| The Chocolate War | Robert Cormier | Nudity, offensive language, sexually explicit, unsuited to age group | 1974 | — | 3 | 4 |
| Christine | Stephen King | Obscene language, sexual themes | 1983 | — | — | 95 |
| A Clockwork Orange | Anthony Burgess | Obscene language | 1962 | 80 | — | — |
| The Color Purple | Alice Walker | Offensive language, sexually explicit, unsuited to age group | 1982 | 50 | 17 | 17 |
| The Color of the Earth (trilogy) | Tong-hwa Kim | Nudity, sex education, sexually explicit, unsuited to age group | 2009 | — | — | — |
| Crank | Ellen Hopkins | Drugs, offensive language, sexually explicit | 2004 | 38 | — | — |
| Crazy | Benjamin Lebert | Obscene language, sexual themes | 2000 | — | 77 | — |
| Crazy Lady! | Jane Leslie Conly | Offensive language | 1993 | — | 45 | 62 |
| Cross Your Fingers, Spit in Your Hat | Alvin Schwartz | Supernatural themes | 1974 | — | — | 47 |
| Cujo | Stephen King | Violence, obscene language, explicit sex scenes | 1983 | — | — | 49 |
| The Curious Incident of the Dog in the Night-Time | Mark Haddon | Offensive language, religious viewpoint, unsuited for age group, and other (“profanity and atheism”) | 2003 | 51 | — | — |
| Curses, Hexes and Spells | Daniel Cohen | Supernatural themes, references to the Bible | 1974 | — | — | 71 |
| Cut | Patricia McCormick | References to cutting and self-harm | 2000 | — | 86 | — |
| Daddy’s Roommate | Michael Willhoite | LGBT themes | 1991 | — | — | 2 |
| Daughters of Eve | Lois Duncan | Obscene language, sexual content, and violence | 1979 | — | 51 | — |
| A Day in the Life of Marlon Bundo | Jill Twiss | LGBTQIA+ content, political and religious viewpoints | 2018 | 19 | — | — |
| A Day No Pigs Would Die | Robert Newton Peck | References to animal slaughter and animal mating | 1972 | — | 80 | 16 |
| The Dead Zone | Stephen King | Obscene language | 1979 | — | — | 82 |
| Deal with It!: A Whole New Approach to Your Body, Brain, and Life as a gURL | Esther Drill | Explicit sexual content and LGBT themes | 1999 | — | 82 | — |
| Deenie | Judy Blume | References to masturbation | 1973 | — | — | 42 |
| Detour for Emmy | Marilyn Reynolds | Sexual content and references to teen pregnancy | 1993 | — | 83 | — |
| The Dirty Cowboy | Amy Timberlake | | 2003 | 60 | — | — |
| Drama | Raina Telgemeier | Includes LGBT characters, was deemed sexually explicit, and was considered to have an offensive political viewpoint | 2012 | 7 | — | — |
| Draw Me a Star | Eric Carle | | 1992 | 65 | — | — |
| Dreaming in Cuban | Cristina García | Sexual content and nude drawings of Adam and Eve | 1992 | 64 | 61 | — |
| The Drowning of Stephan Jones | Bette Greene | LGBT themes | 1991 | — | — | 96 |
| The Earth, My Butt, and Other Big Round Things | Carolyn Mackler | Offensive language, sexually explicit, unsuited to age group | 2003 | — | 34 | — |
| Earth’s Children (series) | Jean M. Auel | Graphic sexual content | 1980–2011 | — | — | 19 |
| Eleanor & Park | Rainbow Rowell | Offensive language | 2013 | 54 | — | — |
| Ender’s Game | Orson Scott Card | | 1985 | 84 | — | — |
| Extremely Loud & Incredibly Close | Jonathan Safran Foer | | 2005 | 55 | — | — |
| The Face on the Milk Carton | Caroline B. Cooney | Sexual content, challenging authority, and unsuitable for age group | 1990 | — | 29 | 80 |
| The Facts Speak For Themselves | Brock Cole | Sexual content, violence | 1997 | — | 54 | — |
| Fade | Robert Cormier | References to child sexual abuse, and violence | 1988 | — | — | 65 |
| Fahrenheit 451 | Ray Bradbury | Obscene language, references to smoking and drinking, violence, and religious themes | 1953 | — | 69 | — |
| Fallen Angels | Walter Dean Myers | Offensive language, racism, violence | 1988 | 85 | 11 | 36 |
| The Family Book | Todd Parr | | 2003 | 67 | — | — |
| Family Secrets | Norma Klein | Sexual content, obscene language, references to adultery, smoking, and implied incest | 1985 | — | — | 76 |
| A Farewell to Arms | Ernest Hemingway | Sexual content | 1929 | — | — | — |
| Fat Kid Rules the World | KL Going | Obscene language, sexual themes, and drug use | 2003 | — | 58 | — |
| Feed | M.T. Anderson | | 2002 | 68 | — | — |
| Fight Club | Chuck Palahniuk | Sexually explicit, violence, anarchist themes, smoking, drinking | 1996 | — | — | — |
| Fifty Shades of Grey (series) | E. L. James | Sexually explicit, unsuited to age group, and other (“poorly written,” “concerns that a group of teenagers will want to try it”) | 2011 | 8 | — | — |
| The Fighting Ground | Avi | Obscene language | 1984 | — | 42 | — |
| Final Exit | Derek Humphry | References to assisted suicide | 1991 | — | — | 29 |
| Flashcards of My Life | Charise Mericle Harper | Sexual content and unsuitable to age group | 2006 | — | — | — |
| Flowers for Algernon | Daniel Keyes | Sexual content | 1966 | — | — | 43 |
| For Whom the Bell Tolls | Ernest Hemingway | Pro-Communist views | 1940 | — | — | — |
| Forever… | Judy Blume | Offensive language, sexual content | 1975 | — | 16 | 7 |
| Friday Night Lights | H. G. Bissinger | Obscene language, sexual content, and racism | 1990 | — | 89 | — |
| Fun Home | Alison Bechdel | Violence and other (“graphic images”). | 2006 | 31 | — | — |
| Melissa | Alex Gino | Includes a transgender child, and the “sexuality was not appropriate at elementary levels” | 2015 | 5 | — | — |
| The Giver | Lois Lowry | Obscene language, sexual content, violence, and unsuitable to age group | 1993 | 61 | 23 | 11 |
| Girls and Sex | Wardell Pomeroy | Sex education | 1970 | — | — | 98 |
| Glass | Ellen Hopkins | Drugs | 2007 | 86 | — | — |
| The Glass Castle | Jeannette Walls | Offensive language, sexually explicit | 2005 | 17 | — | — |
| Go Ask Alice | Anonymous | Drugs | 1971 | — | 18 | 25 |
| Go Tell It on the Mountain | James Baldwin | Obscene language, explicit sex, references to masturbation, rape, violence and sexism | 1953 | — | — | — |
| Go the Fuck to Sleep | Adam Mansbach | Offensive language | 2011 | 69 | — | — |
| The Goats | Brock Cole | Obscene language and a scene describing the rescue of a naked woman | 1987 | — | — | 26 |
| Gone with the Wind | Margaret Mitchell | Several uses of racial slurs, the book’s portrayal of slavery, and references to rape | 1936 | — | — | — |
| Goosebumps (series) | R. L. Stine | Supernatural themes, violence, and encouraging disobedience | 1992–1997 | 46 | 94 | 15 |
| Gossip Girl (series) | Cecily von Ziegesar | Drugs, offensive language, sexually explicit | 2002–2011 | 56 | 22 | — |
| The Grapes of Wrath | John Steinbeck | Portrays Kern County, California in a negative light | 1939 | — | — | — |
| The Great Gatsby | F. Scott Fitzgerald | Language and sexual references | 1925 | — | — | — |
| The Great Gilly Hopkins | Katherine Paterson | Obscene language and racism | 1978 | — | 52 | 20 |
| Grendel | John Gardner | Depictions of torture and mutilation | 1971 | — | 96 | — |
| Guess What? | Mem Fox | Supernatural things and references to punk rock | 1990 | — | — | 66 |
| Habibi | Craig Thompson | Nudity, sexually explicit, and unsuited for age group | 2011 | 70 | — | — |
| Halloween ABC | Eve Merriam | Possible Satanic and cult references, as well as violence | 1987 | — | — | 31 |
| The Handmaid’s Tale | Margaret Atwood | Sexuality, profanity, suicide, violence, anti-Christian themes | 1985 | 29 | 88 | 37 |
| Harris and Me | Gary Paulsen | Obscene language | 1993 | — | 70 | — |
| Harry Potter (series) | J. K. Rowling | Unsuited to age group, witchcraft, religious viewpoint, anti-family, darkness/scariness/violence, and for “setting bad examples” | 1997–2007 | — | 1 | 48 |
| The Hate U Give | Angie Thomas | Profanity, violence, “thought to promote an anti-police message and indoctrination of a social agenda | 2017 | 30 | — | — |
| Heather Has Two Mommies | Lesléa Newman | Homosexuality | 1989 | 87 | — | 9 |
| His Dark Materials (series) | Philip Pullman | Political viewpoint, religious viewpoint, violence | 1995–2000 | — | 8 | — |
| The Holy Bible | various | Religious viewpoint, violence[3] | Canon est. ca. 3rd century A.D. | 52 | — | — |
| House of Night (series) | P.C. Cast | | 2007–2014 | 57 | — | — |
| The House of the Spirits | Isabel Allende | Sexual content | 1982 | 71 | 97 | 73 |
| The Hunger Games (series) | Suzanne Collins | Religious viewpoint, dark themes/violence, unsuited to age group | 2008–2010 | 12 | — | — |
| I Am Jazz | Jessica Herthel and Jazz Jennings | Inaccurate, homosexuality, sex education, religious viewpoint, and unsuited for age group | 2014 | 13 | — | — |
| I Know Why the Caged Bird Sings | Maya Angelou | Incest, Sexual Content | 1969 | 88 | 6 | 3 |
| I Saw Esau | Iona Opie, Peter Opie | Obscene language | 2000 | — | 98 | — |
| In Cold Blood | Truman Capote | Violence, sexual content, and obscene language | 1966 | — | — | — |
| In Our Mother’s House | Patricia Polacco | | 2009 | 47 | — | — |
| In the Night Kitchen | Maurice Sendak | Nudity and sexual references exploiting a toddler | 1970 | — | 24 | 21 |
| Internet Girls (series) | Lauren Myracle | Offensive language, religious viewpoint, sexually explicit, unsuited to age group | 2004–2007 | 9 | 9 | — |
| Invisible Man | Ralph Ellison | Obscene language and sexual content | 1952 | — | — | — |
| It’s A Book | Lane Smith | | 2010 | 32 | — | — |
| It’s Perfectly Normal: Changing Bodies, Growing Up, Sex, and Sexual Health | Robie Harris | Nudity, sex education, sexually explicit, unsuited to age group. Additional reasons: “alleges it is child pornography” | 1994 | 22 | 12 | 13 |
| It’s So Amazing | Robie Harris | Sex education, sexual content | 1999 | — | 37 | — |
| Jack | A. M. Homes | LGBT themes and references to divorce and domestic violence | 1990 | — | — | 74 |
| Jacob’s New Dress | Sarah Hoffman | LGBT content | 2014 | 72 | — | — |
| James and the Giant Peach | Roald Dahl | Supernatural themes and references to drug use | 1961 | — | — | 50 |
| The Joy of Gay Sex | Charles Silverstein, Edmund White | LGBT themes and explicit sexual content | 1977 | — | 78 | — |
| Julie of the Wolves | Jean Craighead George | Unsuited to age group, violence | 1972 | — | 91 | 32 |
| Jump Ship to Freedom | James Lincoln Collier, Christopher Collier | Obscene language, violence, and racism | 1981 | — | — | 100 |
| Jumper | Steven Gould | References to physical and sexual abuse towards children | 1992 | — | — | 94 |
| The Jungle | Upton Sinclair | Author’s pro-Socialism and anti-Communism views | 1906 | — | — | — |
| Junie B. Jones (series) | Barbara Park | Encouraging disobedience | 1992–2011 | — | 71 | — |
| Kaffir Boy | Mark Mathabane | References to male prostitution and sexual abuse | 1986 | — | 39 | 33 |
| Killing Mr. Griffin | Lois Duncan | Violence and obscene language | 1978 | — | 25 | 64 |
| King & King | Linda De Haan, Stern Nijland | Homosexuality | 2002 | — | 20 | — |
| Kingdom of Little Wounds | Susann Cokal | Sexual content, homosexuality | 2013 | 78 | — | — |
| The Kite Runner | Khaled Hosseini | Offensive language, unsuited to age group, violence | 2003 | 11 | 50 | — |
| Lady Chatterley’s Lover | D. H. Lawrence | Sexual content | 1928 | — | — | — |
| Less than Zero | Bret Easton Ellis | Drug abuse, sexual content, language and a bisexual main character | 1985 | — | — | — |
| The Librarian of Basra | Jeanette Winter | Violence, unsuited to age group, promotion of Islam, “un-American” content[12] | 2005 | 96 | — | — |
| Life is Funny | E.R. Frank | Sexual content | 2000 | — | 40 | — |
| A Light in the Attic | Shel Silverstein | Violence and encouraging disobedience | 1981 | — | — | 51 |
| Little Bill (children book series) | Bill Cosby, illustrated by Varnette P. Honeywood | Criminal sexual allegations against the author | 1997–2000 | — | — | — |
| Lolita | Vladimir Nabokov | References to pedophillia and sexual abuse | 1955 | 73 | — | — |
| Looking for Alaska | John Green | Offensive language, sexually explicit, and unsuited for age group. | 2005 | 4 | — | — |
| Lord of the Flies | William Golding | Obscene language, violence, and animal cruelty | 1954 | — | — | 68 |
| The Lord of the Rings | J. R. R. Tolkien | Supernatural themes | 1954 | — | — | — |
| The Lovely Bones | Alice Sebold | Religious themes | 2002 | — | 74 | — |
| Lush | Natasha Friend | Drugs, offensive language, sexually explicit, unsuited to age group | 2006 | 48 | — | — |
| Madeline and the Gypsies | Ludwig Bemelmans | Slur | 1958 | 89 | — | — |
| Make Something Up: Stories You Can’t Unread | Chuck Palahniuk | Profanity, sexual explicitness, and being “disgusting and all around offensive” | 2015 | — | — | — |
| Mein Kampf | Adolf Hitler | Glorification of militant nationalism, Nazism and anti-semitism | 1925 | — | — | — |
| Monster | Walter Dean Myers | | 1999 | 74 | — | — |
| Mick Harte Was Here | Barbara Park | Obscene language and references to death | 1996 | — | 64 | — |
| Mummy Laid an Egg | Babette Cole | Sex education | 1994 | — | — | 77 |
| My Brother Sam Is Dead | James Lincoln Collier, Christopher Collier | Obscene language and violence | 1974 | — | 27 | 12 |
| My Mom’s Having a Baby! | Dori Hillestad Butler | Nudity, sex education, sexual content, and unsuitable for age group | 2005 | 58 | — | — |
| My Princess Boy | Cheryl Kilodavis | LGBT content | 2009 | 90 | — | — |
| My Sister’s Keeper | Jodi Picoult | Homosexuality, offensive language, religious viewpoint, sexism, sexually explicit, unsuited to age group, violence | 2004 | — | — | — |
| The Naked and the Dead | Norman Mailer | Obscene language | 1948 | — | — | — |
| Naked Lunch | William S. Burroughs | Sexual content | 1959 | — | — | — |
| Nasreen’s Secret School: A True Story from Afghanistan | Jeanette Winter | Religious viewpoint, unsuited to age group, and violence | 2009 | 75 | — | — |
| Native Son | Richard Wright | Violence and sexual content | 1940 | — | — | 69 |
| Neonomicon | Alan Moore | Ritualistic sex, psychiatric disorders | 2010 | 59 | — | — |
| The New Joy of Gay Sex | Charles Silverstein, Edmund White, Felice Picano | LGBT themes and sexual content | 1993 | — | — | 24 |
| Nickel and Dimed: On (Not) Getting By in America | Barbara Ehrenreich | Drugs, inaccurate, offensive language, political viewpoint, religious viewpoint | 2001 | 39 | — | — |
| Nineteen Eighty-Four | George Orwell | Pro- and anti-Communist views, sexual content, and violence | 1949 | 79 | — | — |
| Nineteen Minutes | Jodi Picoult | | 2007 | 23 | — | — |
| Of Mice and Men | John Steinbeck | Offensive language, racism, violence | 1937 | 28 | 5 | 6 |
| Olive’s Ocean | Kevin Henkes | Obscene language and sexual content | 2003 | — | 59 | — |
| On My Honor | Marion Dane Bauer | References divorce, death, suicide, and defeat | 1986 | — | — | 72 |
| One Flew Over the Cuckoo’s Nest | Ken Kesey | Obscene language, violence, and references to mental illness | 1962 | — | 49 | — |
| Ordinary People | Judith Guest | Obscene language and sexual content | 1976 | — | — | 52 |
| The Outsiders | S. E. Hinton | Obscene language, gang violence, underage smoking and drinking, strong language/slang, and family dysfunction, legitimisation of murder and anti-religious content | 1967 | — | — | 38 |
| The Perks of Being a Wallflower | Stephen Chbosky | Drugs/alcohol/smoking, homosexuality, offensive language, sexually explicit, unsuited for age group. Additional reasons: “date rape and masturbation” | 1999 | 14 | 10 | — |
| Persepolis (series) | Marjane Satrapi | Gambling, offensive language, political viewpoint. Additional reasons: “politically, racially, and socially offensive,” “graphic depictions” | 2000–2003 | 40 | — | — |
| The Pigman | Paul Zindel | Obscene language | 1968 | — | 39 | — |
| The Pillars of the Earth | Ken Follett | Sexual content and references to violence toward women | 1989 | — | — | 91 |
| A Prayer for Owen Meany | John Irving | Anti-religion and criticism of the Vietnam War and the Iran-Contra incident | 1989 | — | 76 | — |
| Prince & Knight | Daniel Haack, illustrated by Stevie Lewis | LGBTQIA+ content; featuring a gay marriage; being “a deliberate attempt to indoctrinate young children” with the potential to cause confusion, curiosity, and gender dysphoria; conflicting with a religious viewpoint | 2018 | 91 | — | — |
| Private Parts | Howard Stern | Sexual content | 1993 | — | — | 86 |
| Rabbit, Run | John Updike | Sexual content | 1960 | — | — | — |
| Rainbow Boys | Alex Sánchez | LGBT themes, sexual content | 2001 | — | 48 | — |
| Revolutionary Voices | Amy Sonnie | Homosexuality, sexually explicit | 2000 | 92 | — | — |
| Roll of Thunder, Hear My Cry | Mildred D. Taylor | Offensive language | 1976 | — | 66 | — |
| Running Loose | Chris Crutcher | Racial slurs, sexual content | 1983 | — | — | 92 |
| The Rules of Attraction | Bret Easton Ellis | Graphic sexual content, strong suicide scene, language, LGBTQ+ themes | 1987 | — | — | — |
| Saga (series) | Brian K. Vaughan | Anti-family, nudity, offensive language, sexually explicit, and unsuited for age group | 2012–present | 76 | — | — |
| The Satanic Verses | Salman Rushdie | Portrayal of Muhammad in a negative light | 1988 | — | — | — |
| Scary Stories to Tell in the Dark (series) | Alvin Schwartz | Unsuited for age group, violence | 1981–1991 | 24 | 7 | 1 |
| A Separate Peace | John Knowles | Sexual content | 1959 | — | — | — |
| Sex | Madonna | Sexual content | 1992 | — | — | 18 |
| Sex Education | Jenny Davis | Sexual content | 1995 | — | — | 93 |
| Sex is a Funny Word | Cory Silverberg, illustrated by Fiona Smyth | LGBTQIA+ content, discussing gender identity and sex education, concerns that the title and illustrations were “inappropriate,” believed to lead children to “want to have sex or ask questions about sex” | 2015 | 20 | — | — |
| Shade’s Children | Garth Nix | Sexual content and nudity | 1997 | — | 95 | — |
| Skippyjon Jones (series) | Judy Schachner | Depicting stereotypes of Mexican culture | 2001–present | 93 | — | — |
| Slaughterhouse-Five | Kurt Vonnegut | Sexual content, anti-religious content, violence | 1969 | — | 46 | 67 |
| The Sleeping Beauty Quartet (series) | Anne Rice | Sexual content | 1983–2015 | — | — | 55 |
| Snow Falling on Cedars | David Guterson | Sexual content | 1994 | — | 33 | — |
| So Far from the Bamboo Grove | Yoko Kawashima Watkins | References to rape and violence against women | 1986 | 94 | 84 | — |
| Something Happened in Our Town: A Child’s Story About Racial Injustice | Marianne Celano, Marietta Collins, and Ann Hazzard, illustrated by Jennifer Zivoin | “Divisive language”, thought to promote anti-police views[10] | 2018 | — | — | — |
| Song of Solomon | Toni Morrison | Sexual content, bestiality, and racism | 1977 | — | 72 | 84 |
| Sons and Lovers | D. H. Lawrence | Sexual content and incest | 1913 | — | — | — |
| Sophie’s Choice | William Styron | Sexual content | 1979 | — | — | — |
| Speak | Laurie Halse Anderson | References to rape | 1999 | 25 | 60 | — |
| Stamped: Racism, Antiracism, and You | Ibram X. Kendi and Jason Reynolds | Author’s public statements, and because of claims that the book contains “selective storytelling incidents” and does not encompass racism against all people.[10] | 2020 | — | — | — |
| Staying Fat for Sarah Byrnes | Chris Crutcher | Obscene language, sexual content | 1993 | — | 85 | — |
| A Stolen Life: A Memoir | Jaycee Dugard | Drugs/alcohol/smoking, offensive language, sexually explicit, unsuited for age group | 2011 | — | — | — |
| The Story of Little Black Sambo | Helen Bannerman | Racism | 1899 | — | — | 90 |
| Stuck in the Middle: 17 Comics from an Unpleasant Age | Ariel Schrag | | 2007 | 77 | — | — |
| The Stupids (series) | Harry Allard, James Marshall | Promoting negative behavior, references to death, and obscene language | 1974–1989 | — | 62 | 27 |
| Summer of My German Soldier | Bette Greene | Offensive language, racism, sexually explicit | 1973 | — | 55 | 88 |
| The Sun Also Rises | Ernest Hemingway | Sexual content | 1926 | — | — | — |
| Taming the Star Runner | S. E. Hinton | Offensive language | 1988 | — | — | — |
| The Terrorist | Caroline B. Cooney | Portrays Muslims in a negative light | 1997 | — | 63 | — |
| That Was Then, This Is Now | S. E. Hinton | Violence, drug use, obscene language | 1971 | — | — | 97 |
| Their Eyes Were Watching God | Zora Neale Hurston | Author’s political views | 1937 | — | — | — |
| The Things They Carried | Tim O’Brien | Violence, animal abuse, obscene language, and criticism of the Vietnam War | 1990 | 34 | 65 | — |
| Thirteen Reasons Why | Jay Asher | Drugs/alcohol/smoking, sexually explicit, suicide, unsuited for age group | 2007 | 3 | — | — |
| This Book Is Gay | Juno Dawson | LGBTQIA+ content, provides sexual education | 2014 | 53 | — | — |
| This Day in June | Gayle E. Pitman, illustrated by Kristyna Litten | LGBT content | 2013 | 42 | — | — |
| This One Summer | Mariko Tamaki, illustrated by Jillian Tamaki | Includes LGBT characters, drug use and profanity, and considered sexually explicit with mature themes | 2014 | 43 | — | — |
| Tiger Eyes | Judy Blume | Sexual content, drug use, and language | 1981 | — | 87 | 89 |
| A Time to Kill | John Grisham | References to slavery, rape, and the text includes racial slurs | 1989 | — | 67 | — |
| To Kill a Mockingbird | Harper Lee | Offensive language, racism, unsuited to age group | 1960 | 15 | 21 | 40 |
| Tricks | Ellen Hopkins | | 2009 | 98 | — | — |
| Tropic of Cancer | Henry Miller | Sexual content | 1934 | — | — | — |
| Twilight (series) | Stephenie Meyer | Religious viewpoint, violence, sexually explicit, unsuited to age group | 2005–2008 | — | — | — |
| Two Boys Kissing | David Levithan | Homosexuality and other (“condones public displays of affection”). Also considered to include sexually explicit LGBT content | 2013 | 18 | — | — |
| Ulysses | James Joyce | References to masturbation | 1922 | — | — | — |
| Uncle Bobby’s Wedding | Sarah S. Brannen | LGBT themes | 2008 | 99 | — | — |
| The Upstairs Room | Johanna Reiss | Obscene language and references to the Holocaust | 1972 | — | 79 | — |
| The Walking Dead (series) | Robert Kirkman | Graphic content, violence, harsh language, and sexual content. | 2004–2019 | 97 | — | — |
| We All Fall Down | Robert Cormier | Offensive language, sexual content | 1991 | — | 30 | 41 |
| Whale Talk | Chris Crutcher | Racism, offensive language | 2001 | — | 41 | — |
| What My Mother Doesn’t Know | Sonya Sones | Nudity, offensive language, sexually explicit, sexism, unsuited to age group | 2001 | 35 | 31 | — |
| What’s Happening to My Body? Book for Boys | Lynda Madaras | Sex education | 1987/2007 | — | — | 58 |
| What’s Happening to My Body? Book for Girls | Lynda Madaras | Sex education | 1987/2007 | — | 73 | 35 |
| When Dad Killed Mom | Julius Lester | Violence, sexual content | 2001 | — | 56 | — |
| Where Did I Come From? | Peter Mayle | Sex education | 1973 | — | — | 79 |
| Where’s Waldo? | Martin Handford | Nudity | 1987 | — | — | 87 |
| The Wish Giver | Bill Brittain | Supernatural themes | 1983 | — | — | 99 |
| The Witches | Roald Dahl | Misogyny, encouraging disobedience, violence, animal cruelty, obscene language, and supernatural themes | 1983 | — | — | 22 |
| Women in Love | D. H. Lawrence | Sexual content and misogyny | 1920 | — | — | — |
| Women on Top | Nancy Friday | Sexual content | 1991 | — | — | 70 |
| A Wrinkle in Time | Madeleine L’Engle | Supernatural themes and religious themes | 1963 | — | 90 | 23 |
| Year of Wonders | Geraldine Brooks | | 2001 | 100 | — | — |
| You Hear Me? | Betsy Franco | Obscene language and topics | 2000 | — | 53 | — |