A ghost town (deserted city or abandoned city) is an abandoned village, town, or city, usually one that contains substantial visible remaining buildings and infrastructure such as roads. A town often becomes a ghost town because the economic activity that supported it (usually industrial or agricultural) has failed or ended for any reason (e.g. a host ore deposit exhausted by metal mining). The town may also have declined because of natural or human-caused disasters such as floods, prolonged droughts, extreme heat or extreme cold, government actions, uncontrolled lawlessness, war, pollution, or nuclear disasters. The term can sometimes refer to cities, towns, and neighbourhoods that, though still populated, are significantly less so than in past years; for example, those affected by high levels of unemployment and dereliction.

Some ghost towns, especially those that preserve period-specific architecture, have become tourist attractions. Some examples are Bannack, Montana, in the United States, Barkerville, British Columbia, in Canada, Craco in Italy, Aghdam in Azerbaijan, Kolmanskop in Namibia, Pripyat in Ukraine, Dhanushkodi in India and Fordlândia in Brazil.

The town of Plymouth on the Caribbean island of Montserrat is a ghost town that is the de jure capital of Montserrat. It was rendered uninhabitable by volcanic ash from an eruption of the Soufrière Hills Volcano in 1995 and has remained so.