Z for Zachariah is a 2015 apocalyptic science fiction film directed by Craig Zobel and starring Margot Robbie, Chiwetel Ejiofor, and Chris Pine. Written by Nissar Modi, it is based on the 1974 posthumously published book of the same name by Robert C. O'Brien, though the plot differs in some significant ways. The film's plot also resembles that of the 1959 Harry Belafonte movie The World, the Flesh and the Devil, which features a love triangle between a black engineer, white woman, and white man who may be the last people on Earth. The film was released on August 28, 2015, in the United States by Roadside Attractions. It received generally positive reviews from critics who mostly praised Robbie's performance. It grossed $121,461 at the box office.

Roger Craig Zobel is an American filmmaker and actor whose work includes music videos, film, and television. He has directed the films Compliance (2012), Z for Zachariah (2015), and The Hunt (2020). On TV he has directed episodes of The Leftovers, American Gods, and Westworld. In 2021, he directed the miniseries Mare of Easttown on HBO. He also helped to co-create the online Flash animation series Homestar Runner with Mike and Matt Chapman, known collectively as The Brothers Chaps.