Douro is a Portuguese wine region centered on the Douro River in the Trás-os-Montes e Alto Douro region. It is sometimes referred to as the Alto Douro (upper Douro), as it is located some distance upstream from Porto, sheltered by mountain ranges from coastal influence. The region has Portugal's highest wine classification as a Denominação de Origem Controlada (DOC). While the region is associated primarily with Port wine production, the Douro produces just as much table wine (non-fortified wines) as it does fortified wine. The non-fortified wines are typically referred to as "Douro wines".
The style of wines produced in the Douro range from light, Bordeaux style claret to rich Burgundian style wines aged in new oak.
There is archaeological evidence for winemaking in the region dating from the end of the Western Roman Empire, during the 3rd and 4th centuries AD, although grape seeds have also been found at older archaeological sites. In Medieval times from the mid-12th century, Cistercians had an important influence on winemaking in the region, through their three monasteries Salzedas, São João de Tarouca and São Pedro das Águias.