Gran Glacier () is a glacier flowing south into Mackay Glacier between Mounts Gran and Woolnough. It rises from a snow divide with Benson Glacier to the northeast. Named after Mount Gran by the New Zealand Northern Survey Party of the Commonwealth Trans-Antarctic Expedition (1956-58), which visited the area in November 1957.
This article incorporates public domain material from the United States Geological Survey document "Gran Glacier" (content from the Geographic Names Information System).