St. Panteleimon (Pantaleon's) Monastery (Greek: Άγιος Παντελεήμων, Aghios Panteleimon; Russian: Пантелеймонов, known as Ρωσσικόν, Rossikon; Bulgarian: Пантелеймон, known as Русикон, Rusicon) is an Eastern Orthodox monastery built on the southwest side of the peninsula of Mount Athos in Greek Macedonia, Northern Greece.