Holtet Nunatak (74°50′S 73°56′W / 74.833°S 73.933°W) is a nunatak rising to about 1,300 metres (4,300 ft), 2 nautical miles (4 km) northeast of Grossenbacher Nunatak in the Lyon Nunataks of Palmer Land, Antarctica. It was mapped by the United States Geological Survey from aerial photographs taken by the U.S. Navy, 1965–68, and from Landsat imagery taken 1973–74. It was named in 1987 by the Advisory Committee on Antarctic Names after of the , an upper atmospheric physicist at Siple Station, 1970–71.