The Perks of Being a Wallflower is a 2012 American coming-of-age romantic drama film written and directed by Stephen Chbosky, and based on his 1999 novel. Logan Lerman stars as a teenager named Charlie who writes to an unnamed friend, and these epistles chronicle his trials, tribulations, and triumphs as he goes through his freshman year of high school. The film depicts his struggles with his, unbeknownst to him, post-traumatic stress disorder, as he goes through his journey in high school making new friends, portrayed by Emma Watson and Ezra Miller. The film's ensemble cast also includes Mae Whitman, Kate Walsh, Dylan McDermott, Joan Cusack, Nina Dobrev, and Paul Rudd in supporting roles.

Chbosky had always intended to adapt the novel to film, but did not rush to do so. He was hesitant to sell the rights to the film to anyone, but eventually sold them to Mr. Mudd Productions as long as they let him write and direct the film. Filming began in Pittsburgh, Pennsylvania, in May 2011 and lasted approximately fifty days.

The Perks of Being a Wallflower had its world premiere at the 2012 Toronto International Film Festival on September 8, 2012, to a standing ovation. It was released theatrically in the United States on September 21, 2012, by Summit Entertainment. The film was well received by critics, who praised Chbosky's screenplay and direction, the performances of Lerman, Watson and Miller, soundtrack, execution of its topics, and emotional weight. It was also a box office success, grossing $33.3 million on a budget of $13 million, and received several accolades, including the Independent Spirit Award for Best First Feature, two Critics' Choice Movie Awards nominations, and the GLAAD Media Award for Outstanding Film – Wide Release. The film has since become a cult classic, especially among Zillennials, and helped define the "Tumblr era" in the early 2010s.