Weasel Collar Glacier is a glacier in Glacier National Park, Montana, immediately east of Mount Carter at an average elevation of about 7,500 feet. Set in a cirque with a north-facing terminus, it stands out for changing very little compared with other park glaciers in the late 20th century. From 1966 to 2005, it lost 6.7 percent of its surface area, the smallest recorded loss of glacial ice for any glacier in Glacier National Park during that period.