Supreme Ruler is a strategy video game in which a player controls a region's government and attempts to conquer a fictional world of fragmented states.

The game simulates raising funds through taxes and spending on agriculture, government services, and the military.

Up to 9 regions play at once, either human hotseat or AI controlled, and all actions are resolved simultaneously at the end of each turn.

The game was created by George Geczy and produced and published by JMG Software International, released for the TRS-80 microcomputer system in October 1982.

[1] The original Supreme Ruler games were the inspiration for George Geczy and David Thompson to create a modern version for Microsoft Windows.