War World

War World may refer to:


 * War World (series), collaborative science fiction books set in the CoDominium universe of Jerry Pournelle
 * War World (video game), a 2005 mech combat video game
 * Warworld, a fictional planet in the DC Universe
 * "War World", a 2002 episode of Justice League
 * Justice League: Warworld, a 2023 U.S. animated film based on D.C. Comics