The Comunidade Intermunicipal da Lezíria do Tejo (European Portuguese pronunciation: [lɨˈziɾiɐ ðu ˈtɛʒu]; "Tagus Floodplain") is an administrative division in Portugal.

Lezíria do Tejo comprises municipalities of the former districts of Santarém and Lisbon.

The population in 2011 was 247,453,[3] in an area of 4,275 square kilometres (1,651 sq mi).

Lezíria is the Portuguese word (from the Arabic الجزيرة, al-jazira, "the island") for floodplain or freshwater marsh.

The Lezíria is a well-renowned center of intensive farming, horse breeding and animal husbandry.