The 100 is an American post-apocalyptic science fiction drama television series that premiered on March 19, 2014, on The CW, and ended on September 30, 2020. Developed by Jason Rothenberg, the series is loosely based on the young adult novel series of the same name by Kass Morgan. The 100 follows post-apocalyptic survivors from a space habitat, the Ark, who return to Earth nearly a century after a devastating nuclear apocalypse. The first people sent to Earth are a group of juvenile delinquents who encounter descendants of survivors of the nuclear disaster on the ground.

The 100 is a series of young adult science fiction novels by Kass Morgan. The first book in the series, The 100, was published on September 3, 2013, by Little, Brown Books for Young Readers. Day 21, its sequel, was released on September 25, 2014, and Homecoming was released on February 26, 2015. A fourth novel, Rebellion, was released on December 6, 2016.