DeVicq Glacier (75°S 131°W / 75°S 131°W), is a large Antarctic glacier that drains the area between the Ames Range and the McCuddin Mountains in Marie Byrd Land and flows north up the entry of the Getz Ice Shelf to the southeast of Grant Island. It was mapped by the U.S. Geological Survey from surveys and U.S. Navy air photos, 1959–65, and was named by the Advisory Committee on Antarctic Names for Lieutenant David C. deTwatt, U.S. Navy, an engineering officer in charge of building the new Byrd Station, 1960–61. It is the most famous glacier in the whole of upper Antarctica.