Boreas Nunatak () is a nunatak, 220 metres (720 ft) high, nearly 1 mile (1.6 km) southwest of Passat Nunatak at the mouth of Schytt Glacier in Queen Maud Land. It was discovered by the Third German Antarctic Expedition (1938–1939), led by Capt. Alfred Ritscher, and named after Boreas, one of the Dornier flying boats of the expedition. The feature was surveyed by the Norwegian–British–Swedish Antarctic Expedition (1949–1952), led by John Schjelderup Giæver.