Wintergirls is a young adult novel by Laurie Halse Anderson. It follows the story of Lia, an eighteen-year-old girl dealing with anorexia nervosa. The novel opens with the news that Lia's best friend of 10 years, Cassie, who was bulimic, has died, and the night she died, she tried to call Lia 33 times. The novel follows the course of Lia's struggles with anorexia, her difficult relationships with her parents and stepmother, and her search to learn about Cassie's fate.
The Washington Post called the book "both painful to read and riveting". The New York Times said that "We recognize Lia, but it’s sometimes hard to relate to her."