Bajo Nunatak is a conspicuous rocky peak rising to 210 m at the south edge of the ice cap of Robert Island in the South Shetland Islands, Antarctica. The nunatak surmounts Zahari Point to the southeast, Micalvi Cove to the east-southeast, and English Strait to the southwest.
The feature was charted and descriptively named by the Chilean Antarctic Expeditions in 1948–50.