Spacewar may refer to:

• Spacewar!, a game for the PDP-1 computer

Spacewar (stylized "Spacewar!") is one of the earliest digital computer video games. It is a two-player game, with each player taking control of a starship and attempting to destroy the other. A star in the center of the screen pulls on both ships and requires maneuvering to avoid falling into it. In an emergency, a player can enter hyperspace to return at a random location on the screen, but only at the risk of exploding if it is exploited.