Mosbytoppane (earlier Mosbytoppen, sometimes anglicized as Mosby Peak), are two crags to the southwest of the caldera of the island of Bouvetøya. The tallest is a snow-covered peak above mean sea level and northeast of Norvegiaodden. It was charted by the First Norvegia Expedition in 1927-28, under Captain Harald Horntvedt. It is named for Hakon Mosby, an oceanographer and meteorologist who was one of two scientists on the expedition.