The First Purge is a 2018 American dystopian action horror film directed by Gerard McMurray and starring Y'lan Noel, Lex Scott Davis, Joivan Wade, and Steve Harris. Written and co-executive produced by James DeMonaco, it is the first film of The Purge series not to be directed by him.

It is the fourth installment in the Purge franchise. The film is a prequel depicting the origins of the annual "Purge", a 12-hour span once a year in which all crime in America, including murder, rape and arson, is decriminalized; it originates as an experiment confined to Staten Island with the promise that those who stay on the island for its duration will be paid a large sum of money, but a new political party, the New Founding Fathers, is determined to get the results they want by any means necessary.

The First Purge was released on July 4, 2018, by Universal Pictures. It grossed over $137 million worldwide, becoming the highest-grossing entry in the franchise, but received mixed reviews from critics like its predecessors. The fifth installment, The Forever Purge, was released on July 2, 2021.