Mount Eissinger () is a large ridge-like mountain at the north side of Riley Glacier on the west side of Palmer Land. The feature has a snow-topped upper surface, bare rock cliffs along the north side, and an impressive rectangular rock buttress rises in an unbroken, near-vertical sweep from the glacier to 500 m at the west end. Mapped by the United States Geological Survey (USGS) in 1974. Named by Advisory Committee on Antarctic Names (US-ACAN) for Karlheinz Eissinger, USGS topographic engineer with the Ellsworth Land Survey party, 1968-69.
This article incorporates public domain material from the United States Geological Survey document "Mount Eissinger" (content from the Geographic Names Information System).