Altsek Nunatak (Nunatak Altsek \'nu-na-tak al-'tsek\) is a 170-metre-high (560 ft) rocky hill projecting from the Murgash Glacier on Greenwich Island, Antarctica. The peak is named after Khan Altsek, whose Bulgarians settled in Italy in the 7th century AD.
The peak is located at 62°29′41.6″S 59°52′43″W / 62.494889°S 59.87861°WCoordinates: 62°29′41.6″S 59°52′43″W / 62.494889°S 59.87861°W which is 1.96 km northeast of Yovkov Point, 740 m southeast of Lloyd Hill, 970 m east of Kotrag Nunatak, 1.6 km west by north of Tile Ridge and 2.5 km north-northwest of Kaspichan Point.
This article includes information from the Antarctic Place-names Commission of Bulgaria which is used with permission.