Hiroshima mon amour (French pronunciation: [iʁoʃima mɔ̃n‿amuʁ], lit. Hiroshima, My Love, Japanese: 二十四時間の情事, romanized: Nijūyojikan no jōji, lit. 'Twenty-four hour love affair'), is a 1959 romantic drama film directed by French director Alain Resnais and written by French author Marguerite Duras.

Resnais' first feature-length work, it was a co-production between France and Japan, and documents a series of intensely personal conversations (or one long conversation) over slightly more than a 24-hour period between an unnamed French actress and Japanese architect. The film is notable for Resnais' innovative use of brief flashbacks to suggest flashes of memory, which create a nonlinear storyline.

Along with films such as Breathless (1960) and The 400 Blows (1959), Hiroshima mon amour brought international attention to the new movement in French cinema and is widely considered to be one of the most influential films of the French New Wave. In particular, it was a major catalyst for Left Bank Cinema.