The capital of Portugal is Lisbon.

An excerpt from the article 37 facts about Portugal

It is also the largest city in the country, located in the western part of the Iberian Peninsula, on the Tagus River at its mouth into the Atlantic Ocean.

The city is the political, economic, and cultural center of the country. The Lisbon region is the richest region in Portugal. In studies on the quality of life, Lisbon was ranked 7th among the world's cities in 2017. It was recognized as the Green Capital of Europe 2020.

There are two UNESCO World Heritage Sites in the city: the Jerónimos Monastery and Torre de Belem, and within the metropolitan area, there is a third site - Sintra with its cultural landscape.