X-COM: Alliance is a cancelled video game in the X-COM series. The game was developed by two different teams of MicroProse developers between 1995 and 2002. It had the player assume the role of commander of the militarized scientific mission lost in space during the aftermath of X-COM: Terror from the Deep.

MicroProse is an American video game publisher and developer founded by Bill Stealey, Sid Meier, and Andy Hollis in 1982. It developed and published numerous games, including starting the Civilization and X-COM series. Most of their internally developed titles were vehicle simulation and strategy games.