Expo 2008 was an international exposition held from Saturday 14 June to Sunday 14 September 2008 in Zaragoza, Spain, with the theme of "Water and Sustainable Development". The exposition was placed in a meander of the river Ebro. It was coordinated by the Bureau International des Expositions, the organization responsible for sanctioning World's Fairs.

A world's fair, also known as a universal exhibition or an expo, is a large global exhibition designed to showcase the achievements of nations. These exhibitions vary in character and are held in different parts of the world at a specific site for a period of time, typically between three and six months.