科堡半岛（英语：Cobourg Peninsula 或 Coburg）也译作库伯格半岛、哥布加半岛，位于澳大利亚北部地区阿纳姆地西北端，北滨阿拉弗拉海，南临范迪门湾，最西端唐角隔邓达斯海峡与梅尔维尔岛相望。长约100公里，海岸线曲折，北岸多小海 湾，其中最大的埃辛顿港（Port Essington）长31公里，宽11公里，早期曾为一个定居点。第一位看到科堡半岛的西方人是1818年到达此地的英国皇家海军上校菲利普·帕克·金（Phillip Parker King），他以维多利亚女王的舅父萨克森-科堡的利奥波德亲王（Prince Leopold of Saxe-Coburg，即后来的比利时国王利奥波德一世）的头衔命名。现半岛上开辟为基那奥巴鲁国家公园（Garig Gunak Barlu National Park），由原住民和北部地区政府共同管理。

The Cobourg Peninsula is located 350 km east of Darwin in the Northern Territory, Australia. It is deeply indented with coves and bays, covers a land area of about 2,100 km², and is virtually uninhabited with a population ranging from about 20 to 30 in five family outstations, but without any notable settlement or village. It is separated from Croker Island in the east by Bowen Strait, which is 2.5 km wide in the south and up to 7 km in the north, and 8.5 km long. In the west, it is separated from Melville Island by Dundas Strait. From Cape Don, the western point of the peninsula, to Soldier Point in the east of Melville Island, the distance is 28 km. In the north is the Arafura Sea, and in the south the Van Diemen Gulf. The highest elevation is Mount Roe in the south with an altitude of 160 m.