Port wine (also known as Vinho do Porto, Porto, and often simply Port) is a Portuguese fortified wine from the Douro Valley in the northern provinces of Portugal. It is typically a sweet red wine, but also comes in dry, semi-dry and white varieties. It is often served as a dessert wine.

Wines in the style of port are produced around the world in several countries—most notably Australia, South Africa, Canada, India, Argentina and the United States. Under European Union guidelines, only the product from Portugal may be labeled as Port. In the United States, the situation is more complicated: wines labeled Port may come from anywhere in the world, while the names Dao, Oporto, Porto, and Vinho do Porto have been recognized as foreign, non-generic names for wines originating in Portugal.

Port is produced from grapes grown and processed in the demarcated Douro region. The wine produced is then fortified with the addition of a Brandy (distilled grape spirits) known as Aguardente in order to stop the fermentation, leaving residual sugar in the wine, and to boost the alcohol content. The wine is then stored and aged, often in barrels stored in caves (Portuguese meaning "cellars") as is the case in Vila Nova de Gaia, before being bottled.

The wine received its name, "Port," in the latter half of the 17th century from the seaport city of Porto at the mouth of the Douro River, where much of the product was brought to market or for export to other countries in Europe. The Douro valley where Port wine is produced was defined and established as a protected region, or appellation in 1756 — making it the third oldest defined and protected wine region in the world after Tokaji (1730) and Chianti (1716). The reaches of the valley of the Douro River in northern Portugal have a microclimate that is optimal for cultivation of olives, almonds, and especially grapes important for making the famous Port wine.

The region around Pinhão and São João da Pesqueira is considered to be the centre of Port production, and is known for its picturesque quintas—farms clinging on to almost vertical slopes dropping down to the river.

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