马格尼特湾是南极洲的海湾，长11公里、宽3公里，距离内皮尔山脉57公里，现时受南极条约管理，该海湾被1929至1931年期间由英国、澳洲和新西兰的探险队绘制于地图中。

Magnet Bay is a shallow coastal indentation, 13 kilometres (7 nmi) wide and receding only 3.7 kilometres (2 nmi), located 17 kilometres (9 nmi) west of Cape Davis at the northwest side of Edward VIII Plateau in Antarctica.

The British Australian New Zealand Antarctic Research Expedition, 1929–31, under Mawson, originally charted Magnet Bay as a larger bay extending from Cape Davis to Cape Borley, naming it after the vessel Magnet, in which Peter Kemp first sighted land in this vicinity in 1833. Later exploration, particularly that of the Lars Christensen Expedition, 1936–37, has shown the bay to be less extensive.