Be More Chill is a musical with original music and lyrics by Joe Iconis, and a book by Joe Tracz, based on the 2004 novel of the same name by Ned Vizzini. After a 2015 regional theatre production, the musical premiered off-Broadway in 2018. A Broadway production began previews on February 13, 2019, and officially opened on March 10, 2019. The Broadway production closed on August 11, 2019. An Off West End production opened on February 18, 2020, and temporarily closed on March 16, 2020, due to the ongoing COVID-19 pandemic with the production being cancelled on June 3, 2020. In 2021, it was announced that the production, featuring the original London cast, would resume performances on the West End at the Shaftesbury Theatre for a 10-week run starting June 30. A Chicago production was set to open in July 2020.

Be More Chill is a novel written by American author Ned Vizzini and published on June 1, 2004. It follows unpopular high school student and social outcast Jeremy Heere, who is considered a loser by his peers. Deeply unsatisfied with his poor reputation and lack of romantic and sexual progress with his crush Christine, Jeremy obtains a SQUIP, a supercomputer in the form of a pill that travels to his brain upon ingestion and radically transforms Jeremy’s behavior and social status by giving him advice on how to be cool. The book was received positively for its amusing premise, plot, and humor. It has been adapted to a popular stage musical and a graphic novel.