The Night Porter (Italian: Il portiere di notte) is a 1974 Italian psychological war drama film co-written and directed by Liliana Cavani. It stars Dirk Bogarde and Charlotte Rampling, with Philippe Leroy, Gabriele Ferzetti and Isa Miranda in supporting roles. Set in Vienna in 1957, the film centers on the sadomasochistic relationship between a former Nazi concentration camp officer (Bogarde) and one of his inmates (Rampling).

The film's themes of sexual and sadomasochistic obsession, and its use of Holocaust imagery, have made the film controversial since its initial release, dividing critics over its artistic value. In July 2018, it was selected to be screened in the Venice Classics section of the 75th Venice International Film Festival.