乌斯怀亚（西班牙语：Ushuaia）是阿根廷火地岛省的首府，位于大火地岛南岸，座落在群山环抱之中，远眺比格尔海峡，被认为是世界最南端的城市。2010年普查人口为56,956人。一条以阿根廷国父沙马丁为名的石板路，贯穿乌斯怀亚市中心，街道两旁有很多专做观光客生意的礼品店、百货店、餐厅和贩卖当地加工区生产的免税电器商品店。城内的乌斯怀亚博物馆是由废置的监狱改装而成，两层楼的建筑物本身就是历史的遗迹，馆内分成监狱和海事两个展示部，监狱馆依然保存昔日监狱的原貌和设施，展出乌斯怀亚早期的照片和一些重要囚犯的数据。

Ushuaia (/uːˈʃwaɪ.ə/; Spanish pronunciation: [uˈswaʝa]) is the capital of Tierra del Fuego, Antártida e Islas del Atlántico Sur Province, Argentina. It is commonly regarded as the southernmost city in the world. Ushuaia is located in a wide bay on the southern coast of Isla Grande de Tierra del Fuego, bounded on the north by the Martial mountain range, and on the south by the Beagle Channel. It is the only municipality in the Department of Ushuaia, which has an area of 9,390 km (3,625 sq mi).