Zofia Posmysz (born 23 August 1923) is a Polish author. In 1942 she was arrested by the Gestapo on suspicion of distributing anti-Nazi leaflets. She survived the Auschwitz and Birkenau concentration camps and afterwards gained a position with Polish national radio. She is the author of several works including the 1959 radio play The Passenger in Cabin 45, which was adapted into her 1962 novel Passenger, and into a television play and film The Passenger. Composer Mieczysław Weinberg used the story as the basis for his 1968 opera The Passenger.