Expo 2012 was an International Exposition recognized by the Bureau International des Expositions (BIE) held in Yeosu, South Korea which opened on May 12, 2012 and ran until August 12, 2012. The theme of the Expo was "The Living Ocean and Coast" with subthemes of "Preservation and Sustainable Development of the Ocean and Coast", "New Resources Technology", and "Creative Marine Activities". There were 105 participating countries, international organizations, and 8,203,956 visitors.

Yeosu, formerly romanized as Yosu, is the second largest city in South Jeolla Province, South Korea. In 1998, the Old Yeosu City, Yeocheon City and Yeocheon County were merged and the current city, Yeosu, was formed.