MEO Arena is a multi-purpose indoor arena in Lisbon, Portugal. The arena is among the largest indoor arenas in Europe and the largest in Portugal with a capacity of 20,000 people and was built in 1998 for Expo '98.

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.