Frederiksborg Glacier (Danish: Frederiksborg Gletscher) is a glacier on the east coast of the Greenland ice sheet.

Administratively this glacier is part of the Sermersooq Municipality.

[2] In 1935–36, during the British East Greenland Expedition led by geologist Lawrence Wager, E. C. Chambers and Dr. P. B. Fountaine set up walking up the glacier on an exploratory journey but had to turn back because it was too badly crevassed.

[1] In its upper reaches the glacier flows at the foot of Actress, the highest peak of the Lemon Range.

Its terminus is at the head of the Watkins Fjord, one of the branches of the great Kangerlussuaq Fjord system of the East Greenland coast.