Arriens Glacier (73°27′48″S 68°24′1″E / 73.46333°S 68.40028°ECoordinates: 73°27′48″S 68°24′1″E / 73.46333°S 68.40028°E) is a small Antarctic glacier, south of Casey Point in the Mawson Escarpment, flowing west to reach Lambert Glacier. It was plotted from ANARE aerial photographs taken in 1956, 1960 and 1973, and named by the Australian Antarctic Names and Medals Committee after P. Arriens, geochronologist with the ANARE Prince Charles Mountains survey party in 1973.