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The military–industrial complex (MIC) describes the relationship between a nation's military and the defense industry that supplies it, seen together as a vested interest which influences public policy.

A driving factor behind this relationship between the government and defense-minded corporations is that both sides benefit—one side from obtaining war weapons, and the other from being paid to supply them. The term is most often used in reference to the system behind the military of the United States, where it is most prevalent due to close links between defense contractors, the Pentagon and politicians and gained popularity after a warning on its detrimental effects in the farewell address of President Dwight D. Eisenhower on January 17, 1961.

In the context of the United States, the appellation is sometimes extended to military–industrial–congressional complex (MICC), adding the U.S. Congress to form a three-sided relationship termed an iron triangle. These relationships include political contributions, political approval for military spending, lobbying to support bureaucracies, and oversight of the industry; or more broadly to include the entire network of contracts and flows of money and resources among individuals as well as corporations and institutions of the defense contractors, private military contractors, The Pentagon, the Congress and executive branch.