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.

Portugal is a democratic republic ruled by the constitution of 1976 with Lisbon, the nation's largest city, as its capital. The four main governing components are the president of the republic, the assembly of the republic, the government, and the courts. The constitution grants the division or separation of powers among legislative, executive, and judicial branches. Portugal like most European countries has no state religion, making it a secular state.

Portugal is a founding member of NATO (1949), OECD and EFTA; it left the latter in 1986 to join the European Union. In 1996 it co-founded the Community of Portuguese Language Countries. It has a friendship alliance and dual citizenship treaty with Brazil. Portugal is part of the world's oldest active alliance through its treaty with the United Kingdom.