Donnellan Glacier () is a glacier steep valley glacier fed by highland ice adjacent to Opalchenie Peak and Fukushima Peak on the summit Vinson Plateau, Sentinel Range in Ellsworth Mountains, Antarctica. The glacier flows west-southwestward from Opalchenie Peak along the north side of Mount Slaughter into Nimitz Glacier.
The glacier is named by US-ACAN in 2006 after Andrea Donnellan, Satellite Geodesy and Geodynamics Systems Group, Jet Propulsion Laboratory, California Institute of Technology, involved from the mid 1990s in research projects involving the use of GPS in studies of earth crustal deformation in Southern California and also in Antarctica.
This article incorporates public domain material from the United States Geological Survey document "Donnellan Glacier" (content from the Geographic Names Information System).