1. Looking for Alaska, by John Green -- A young man in an Alabama boarding school and his relationship with a girl named Alaska. Challenged for offensive language, being sexually explicit, and unsuitability for its target age group.
2. Fifty Shades of Grey, by E. L. James -- A billionaire seduces a virgin college girl into the BDSM lifestyle, but she breaks it off after it proves too extreme for her. Challenged for explicit content, being poorly written, and concerns teenagers will want to try it.
3. I Am Jazz, by Jessica Herthel and Jazz Jennings -- A biography about the transgender girl from Florida. Challenged for inaccuracy about transgenderism, for being homosexual, and for advocating sex.
4. Beyond Magenta: Transgender Teens Speak Out, by Susan Kuklin -- Interviews with six transgender or gender-neutral teens. Challenged for being "anti-family", having offensive language, and homosexual content.
5. The Curious Incident of the Dog in the Night-Time, by Mark Haddon -- A boy with autism researches a local murder. Challenged for offensive language, its anti-religious viewpoint, being unsuitable for its target age group, profanity, and atheism.
6. The Holy Bible -- It's never been on the most-challenged list before. It's been challenged by atheists a great many times in 2015 for its religious teachings.
7. Fun Home: A Family Tragicomic, by Alison Bechdel -- Graphic novel about a lesbian girl's childhood and attempted suicide. Challenged for putting state funding for South Carolina colleges at risk, violent content, and graphic images.
8. Habibi, by Craig Thompson -- An epic love story set in an Islamic fairy world. Challenged for cultural appropriation, racism, nudity, and sexually explicit content.
9. Nasreen's Secret School: A True Story from Afghanistan, by Jeanette Winter -- The life of an Afghan girl who must keep her schooling secret. Challenged for its social justice agenda, being pro-Muslim, its religious viewpoint, and violent content.
10. Two Boys Kissing, by David Levithan -- Gender, AIDS, sexuality, and an attempt to set a Guiness Record for kissing, narrated by a Greek chorus of men who've died of AIDS. Challenged for its homosexual content and because it condones public displays of affection between men.