Portugal, officially the Portuguese Republic (Portuguese: República Portuguesa), is a country in southwestern Europe, on the Iberian Peninsula. Being the westernmost country of mainland Europe, Portugal is bordered by the Atlantic Ocean to the west and south and by Spain to the north and east. The Atlantic archipelagos of the Azores and Madeira are also part of Portugal.

The land within the borders of today's Portuguese Republic has been constantly settled since prehistoric times. Some of the earliest civilizations include Celtic societies, followed by incorporation into the Roman Republic dominions in the 2nd century BC, and subsequently into Germanic Kingdoms, such as the Suebi and the Visigoths, from the 5th to the 8th century. The Muslim Moors arrived in the early 8th century and conquered the Christian Germanic kingdoms, eventually occupying most of the Iberian Peninsula. In the early 1100s, during the Christian Reconquista, Portugal appeared as a kingdom independent of its neighbour, the Kingdom of León and Galicia. In a little over a century, in 1249, Portugal would establish almost its entire modern-day borders by conquering territory from the Moors.

During the 15th and 16th centuries, with a global empire that included possessions in Africa, Asia and South America, Portugal was one of the world's major economic, political, and cultural powers. In the 17th century, the Portuguese Restoration War between Portugal and Spain ended the sixty year period of the Iberian Union (1580-1640). In the 19th century, armed conflict with French and Spanish invading forces and the loss of its largest territorial possession abroad, Brazil, disrupted political stability and potential economic growth. After the Portuguese Colonial War and the Carnation Revolution coup d'état in 1974, the ruling regime was deposed in Lisbon and the country handed over its last overseas provinces in Africa. Portugal's last overseas territory, Macau, was handed over to the P. R. China in 1999.

Portugal is a developed country, and although having one of the lowest GDP per capita of Western European countries, it has a high Human Development Index and is among the world's 20 highest rated countries in terms of quality of life. It is a member of the European Union (since 1986) and the United Nations (since 1955); as well as a founding member of, NATO, CPLP (Comunidade dos Países de Língua Portuguesa — Community of Portuguese Language Countries), and the European Union's Eurozone.