波尔图（葡萄牙语：Porto），是葡萄牙北部一个面向大西洋的港口城市，2011年人口为130万，城市面积为389平方千米,是葡萄牙第二大城市（次于里斯本）和第一大港，兼波尔图区省会及北部大区的行政、经济与文化中心。市内拥有葡萄牙国内著名的足球会波尔图与知名建筑波尔图音乐厅。

波尔图市由十五个子分区组成，北部接壤马杜辛纽什、和麦雅卫星都市，东部与贡多马尔市接壤；市区南部流有源自西班牙的北部第一大河杜罗河，对岸遥望加亚新城（Vila Nova de Gaia），西面则向大西洋。

葡萄牙的国名与波酒都源于这城市。其旧城区与周围产酒区是世界文化遗产。

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 Southwestern Europe. The urban area of Porto, which extends beyond the administrative limits of the city, has a population of 1.4 million (2011) in an area of 389 km (150 sq mi), making it the second-largest urban area in Portugal. Porto Metropolitan Area, on the other hand, includes an estimated 1.8 million people. It is recognized as a Gamma-level global city by the Globalization and World Cities (GaWC) Study Group, the only Portuguese city besides Lisbon to be recognised as a global city.