Clark Nunatak is a rocky peak rising to 147 m at the southwest edge of the ice cap of Rotch Dome in western Livingston Island, South Shetland Islands, Antarctica near the south extremity of Urvich Wall. It surmounts Volturnus Lake on the south.
The feature is named after Daniel Clark, First Mate of the American sealing vessel Hersilia under Captain James Sheffield in 1820–21.