The Nun is a 2018 American Gothic supernatural horror film directed by Corin Hardy and written by Gary Dauberman, from a story by Dauberman and James Wan. It serves as a spiritual spin-off to The Conjuring 2 and is the fifth installment in The Conjuring shared universe. The film stars Taissa Farmiga, Demián Bichir and Jonas Bloquet, with Bonnie Aarons reprising her role as the Demon Nun, an incarnation of Valak, from The Conjuring 2. The plot follows a Roman Catholic priest and a nun in her novitiate as they uncover an unholy secret in 1952 Romania. It is followed by a sequel The Nun II, released in 2023.

Warner Bros. Pictures and New Line Cinema announced The Nun, a spin-off film to The Conjuring 2, which had opened five days earlier, with Peter Safran and Wan producing. The initial script for the film was written by David Leslie Johnson. Hardy had signed on to direct The Nun with a new screenplay from Wan and Dauberman. Principal photography began in May 2017 in Bucharest, Romania.

The Nun was released in the United States on September 7, 2018. It received mixed reviews and grossed $366 million worldwide, becoming the highest-grossing film of the Conjuring series. In 2023, a sequel The Nun II, was released.