南格鲁吉亚和南桑威奇群岛（英语：South Georgia and The South Sandwich Islands，缩写：SGSSI）位于大西洋南部，现为英国海外领土之一，但阿根廷声称拥有主权。南格鲁吉亚岛与南桑威奇群岛距离福克兰群岛约1300公里，但二者在地缘上几乎融为一体，因此在过去它们本是福克兰群岛的属地，直至1985年时才建制为独立的英国海外领土。南乔治亚岛面积约3592平方公里；而南桑威奇群岛则距离南乔治亚岛东南约750公里，面积约311平方公里。

South Georgia and the South Sandwich Islands (SGSSI) is a British overseas territory in the southern Atlantic Ocean. It is a remote and inhospitable collection of islands, consisting of South Georgia and a chain of smaller islands known as the South Sandwich Islands. South Georgia is 165 kilometres (103 mi) long and 1 to 35 km (1 to 22 miles) wide and is by far the largest island in the territory. The South Sandwich Islands lie about 700 kilometres (430 mi) southeast of South Georgia. The total land area of the territory is 3,903 square kilometres (1,507 sq mi).