Mount Bergersen (72°4′S25°48′E) is a large mountain rising to 2,636 m, standing at the west side of Byrdbreen in the Sor Rondane Mountains. It was mapped by Norwegian cartographers in 1946 from air photos taken by the Lars Christensen Expedition, 1936–37, and named for Ambassador Birger Bergersen, chairman of the Norwegian Whaling Board.