Willan Nunatak is an ice-free tipped peak rising to 449 m on the glacial divide between Huntress Glacier and Balkan Snowfield on Hurd Peninsula in eastern Livingston Island in the South Shetland Islands, Antarctica. It is linked to Burdick South Peak to the northeast by Willan Saddle and, via Castillo Nunatak and Charrúa Gap, to Charrúa Ridge to the west.
The nunatak is named after the British geologist Robert Charles Richard Willan (b. 1952) who has carried out field work in the area.