Question: is rebellion the last book in the 100 series

Answer: Yes, 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.