Imperium is a science fiction board wargame designed by Marc W. Miller, and published in 1977 by the Conflict Game Company and Game Designers' Workshop (GDW). It features asymmetrical forces, the two sides having its unique set of constraints. The game came in a cardboard box illustrated with a space battle on the exterior. It included a cardboard-mounted, folding map of a local region of the Milky Way galaxy, a set of rules and charts, and the 352 counters representing the various spacecraft, ground units, and markers, and a six-sided die.