Nemesis Games is a 2015 science fiction novel by James S. A. Corey, the pen name of Daniel Abraham and Ty Franck, and the fifth book in their The Expanse series. It is the sequel to Cibola Burn. The cover art is by Daniel Dociu. Nemesis Games has received positive reviews. The novel has been referred to as "Corey’s 'Empire Strikes Back'".

James S. A. Corey is the pen name used by collaborators Daniel Abraham and Ty Franck, authors of the science fiction series The Expanse. The first and last name are taken from Abraham's and Franck's middle names, respectively, and S. A. are the initials of Abraham's daughter. The name is also meant to emulate many of the space opera writers of the 1970s. In Germany, their books are published under the name James Corey with the middle initials omitted.