Glass is a 2019 American superhero thriller film written and directed by M. Night Shyamalan. It is a crossover and sequel to Shyamalan's previous films Unbreakable (2000) and Split (2016) and the third and final installment in the Unbreakable trilogy. Bruce Willis, Samuel L. Jackson, Spencer Treat Clark, and Charlayne Woodard reprise their Unbreakable roles, while James McAvoy and Anya Taylor-Joy return as their Split characters, with Sarah Paulson, Adam David Thompson, and Luke Kirby joining the cast. The film sees David Dunn / The Overseer as he and Kevin Wendell Crumb / The Horde are captured and placed in a psychiatric facility with Elijah Price / Mr. Glass, where they contemplate the authenticity of their superhuman powers.

Despite interest in a sequel to Unbreakable, the Walt Disney Studios' Touchstone Pictures opted not to finance a sequel. Shyamalan set out to write Split using a character he had written for Unbreakable but pulled from its script due to balance issues. He realized the opportunity he had to create a trilogy of works, and instead used the ending of Split to establish Glass with the Unbreakable narrative. This necessitated securing the rights to use both Willis' and Jackson's Unbreakable characters from Disney, with the promise of including the studio in the film along with Universal Pictures. Split was a financial and critical success, and by April 2017 Shyamalan announced that he started the production process for Glass.

The film had its world premiere in select Alamo Drafthouse Cinema theaters on January 12, 2019, and was released in the United States on January 18 by Universal Pictures. Glass received mixed reviews from critics, who found the film "disappointing" and "underwhelming" due to the story, particularly the third act, but praised the performances of the cast; many deemed it the weakest in the trilogy. The film was a financial success, grossing $247 million worldwide against a $20 million production budget.