伊萨克森山是南极洲的山峰，位于贝格森山东南面6.4公里，属于南龙达讷山脉的一部分，该山峰以挪威的将军命名，现时受南极条约体系管理。

Isachsen Mountain is a large mountain rising to 2,750 metres (9,020 ft), standing 4 nautical miles (7 km; 5 mi) southeast of Mount Bergersen in the Sør Rondane Mountains of Antarctica. It was mapped by Norwegian cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named for Major Gunnar Isachsen, the leader with Captain Hjalmar Riiser-Larsen of the Norwegian expedition 1930–31.