The Parque das Nações, colloquially known as Expo, is a freguesia and typical quarter of Lisbon, the capital city of Portugal. Located in eastern Lisbon, Parque das Nações is to the east of Olivais, northeast of Marvila, and directly south of Lisbon's border with Loures. The population in 2021 was 22,382.

Expo '98 was an official specialised World's Fair held in Lisbon, Portugal from Friday, 22 May to Wednesday, 30 September 1998. The theme of the fair was "The Oceans, a Heritage for the Future", chosen in part to commemorate 500 years of Portuguese discoveries. The Expo received over 10 million visitors in 132 days, while 143 countries and many organizations were represented.