Cascais (Portuguese pronunciation: [kɐʃˈkajʒ]) is a municipality in the Lisbon District of Portugal, located on the Portuguese Riviera. The population in 2011 was 206,479, in an area of 97.40 km2. Cascais is a major, international tourist destination in Portugal, known for the luxury hotels, resorts, beaches, and casino, which characterize the Portuguese Riviera. Famed for having been the home of numerous royal families and famous personalities, Cascais is of the wealthiest municipalities in both Portugal and the Iberian Peninsula, and is known for the numerous notable events hosted in Sintra, such as the America's Cup and the Horasis Global Meeting.
Cascais's history as a cosmopolitan haven for the rich and famous originates in the 1870s, when King Luís I of Portugal and the Portuguese royal family made the seaside town their summer residence, thus attracting members of the Portuguese aristocracy, who established a summer community there. Cascais is famous for the numerous kings and royal families that have called it home, including King Edward VIII of the United Kingdom, King Juan Carlos I of Spain, and King Umberto II of Italy.
Cascais is one of the wealthiest municipalities in both Portugal and the Iberian Peninsula. It has one of the most expensive real estate markets and one of the highest costs of living in the country. It is consistently ranked highly for its quality of life.