The 1980s (pronounced "nineteen-eighties", shortened to "the '80s" or "the Eighties") was a decade that began on January 1, 1980, and ended on December 31, 1989.

The decade saw a dominance of conservatism and free market economics, and a socioeconomic change due to advances in technology and a worldwide move away from planned economies and towards laissez-faire capitalism compared to the 1970s. As economic deconstruction increased in the developed world, multiple multinational corporations associated with the manufacturing industry relocated into Thailand, Mexico, South Korea, Taiwan, and China. Japan and West Germany saw large economic growth during this decade. The AIDS epidemic became recognized in the 1980s and has since killed an estimated 40.4 million people (as of 2022). Global warming theory began to spread within the scientific and political community in the 1980s.

The United Kingdom and the United States moved closer to supply-side economic policies, beginning a trend towards global instability of international trade that would pick up more steam in the following decade as the fall of the USSR made right-wing economic policy more powerful.

The final decade of the Cold War opened with the US-Soviet confrontation continuing largely without any interruption. Superpower tensions escalated rapidly as President Reagan scrapped the policy of détente and adopted a new, much more aggressive stance on the Soviet Union. The world came perilously close to nuclear war for the first time since the Cuban Missile Crisis in 1962, but the second half of the decade saw a dramatic easing of superpower tensions and ultimately the total collapse of Soviet communism.