Sayer Nunatak is a rocky peak rising to 210 m south of Williams Point on Varna Peninsula, at the north edge of the ice cap of Livingston Island in the South Shetland Islands, Antarctica. The nunatak is forming the north extremity of Vidin Heights and surmounting Dragon Cove to the northeast, Griffin Cove to the north-northwest and Charybdis Cove to the southwest.
The feature is named after the American Captain Sayer, Master of the brig General Scott, who carried out sealing operations in this area in 1821–22.