Aster Glacier () is an Antarctic glacier descending the east slope of Craddock Massif and flowing between Elfring Peak and Willis Ridge into Thomas Glacier in the Sentinel Range, Ellsworth Mountains. It was named by the Advisory Committee on Antarctic Names in 2006, after Richard C. Aster, Professor of Geophysics at the New Mexico Institute of Mining and Technology, who has been involved in volcanological studies at the Mount Erebus volcano observatory on Ross Island, with ice, ocean, and tectonic seismic source research in Antarctica, and with seismic noise and structural studies of west Antarctica.