Cucullia asteris, or star-wort, is a moth of the family Noctuidae.

The species was first described by Michael Denis and Ignaz Schiffermüller in 1775.

It is found through the Palearctic including Japan.

Forewing pale grey; costal area dull reddish brown; the cell and space beyond rufous tinged: stigmata obscure, incompletely defined by brown, the reniform with a dark curved streak at its lower end; outer line defined only below vein 2 on submedian fold where it forms a double red-brown lunule, followed by a white one beyond which is a thick brown blotch or two streaks; both the inner and outer lines are marked by very oblique dark brown streaks on inner margin; hindwing brownish, the basal half dull whitish grey with dark veins.

The moth flies from May to September depending on the location.