Happy Death Day is a 2017 American slasher film directed by Christopher B. Landon, written by Scott Lobdell and starring Jessica Rothe, Israel Broussard, and Ruby Modine. The film was produced by Jason Blum through his Blumhouse Productions banner. It follows a college student who is murdered on her birthday and begins reliving the day over and over again; at that point, she sets out to find the killer and stop her death.
Originally announced in 2007 under the title Half to Death, the film was released on October 13, 2017, by Universal Pictures. It has grossed $122 million worldwide on a $4.8 million budget and received generally positive reviews, with critics deeming the film entertaining while acknowledging the familiar premise, and describing it as "Groundhog Day meets Scream". A sequel, Happy Death Day 2U, began production in May 2018.