The Large Thorn (Ennomos autumnaria) is a moth of the family Geometridae. The species can be found in Western and Central Europe East to Russia and SiberiaThe wingspan is 40–50 mm. The length of the forewings is 21–28 mm. The ground colour is brown, red-brown or yellow-brown to yellowish beige. The forewing edge is scalloped and the forewing is marked with yellow and dark brown lines. The thorax is yellow to light brown. The antennae of the male are pectinate.