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Porto (Portuguese pronunciation: [ˈpoɾtu]), also known as Oporto in English, is the second largest city in Portugal, after Lisbon, and one of the major urban areas in Southern Europe. Its administrative limits (an area of 41.66 km²/16 sq.mi) include a population of 237,584 (2011) inhabitants distributed within 15 civil parishes. The urbanized area of Porto, which extends beyond the administrative limits of the city, has a population of 1.3 million (2011) in an area of 389 km² (150 sq mi), making it the second-largest urban area in Portugal. The Porto Metropolitan Area includes approximately 1.7 million people, and is recognized as a Gamma-level global city by the Globalization and World Cities (GaWC) Study Group, being one of the four cities in the peninsula with global city status (the others being Madrid, Barcelona and Lisbon).

Located along the Douro river estuary in northern Portugal, Porto is one of the oldest European centres, and registered as a World Heritage Site by UNESCO in 1996. Its settlement dates back many centuries, when it was an outpost of the Roman Empire. Its Latin name, Portus Cale, has been referred to as the origin for the name "Portugal," based on transliteration and oral evolution from Latin. In Portuguese the name of the city is spelled with a definite article as "o Porto" (English:  the port). Consequently, its English name evolved from a misinterpretation of the oral pronunciation and referred to as "Oporto" in modern literature and by many speakers.

Portugal ⁱ/ˈpɔrtʃʉɡəl/ (Portuguese: Portugal, IPA: [puɾtuˈɣaɫ]), officially the Portuguese Republic (Portuguese: República Portuguesa) is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and 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 part of Portugal. The country is named after its second largest city, Porto, whose Latin name was Portus Cale.