Istindhalsen Saddle is an ice saddle between Istind Peak and the Grunehogna Peaks in the Ahlmann Ridge of Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (NBSAE) (1949–1952), led by John Schjelderup Giæver, and from air photos by the Norwegian expedition (1958-39).