Deno (Bulgarian: Дено) is a peak in the eastern part of the Rila Mountain in southwestern Bulgaria.

The northern slope is steep, while the southern one is oblique and covered in grass.

A deep gully descends along the north-western slopes that holds perennial firn.

[2] To the west lies the valley of the Musalenska Bistritsa, a tributary of Bulgaria's longest river, the Iskar and Musala refuge; to the north-east is the Saragyol Cirque that contains three glacial lakes.

[2][3] Deno is located in the vicinity of the ski runs of Borovets and the cabin lift to Yastrebots refuge, which make it easily accessible.