西福克兰岛，又称大马尔维纳岛，是福克兰群岛中第二大岛屿，与东福克兰岛隔福克兰海峡相望。该岛面积4,532平方公里，总人口约200人。

该岛的最高点在亚当山，海拔700m。

West Falkland (Spanish:Isla Gran Malvina) is the second largest of the Falkland Islands in the South Atlantic. It is a hilly island, separated from East Falkland by the Falkland Sound. Its area is 4,532 square kilometres (1,750 square miles), 37% of the total area of the islands. Its coastline is 1,258.7 kilometres (782.1 miles) long.