Lasionycta subdita is a moth species of the family Noctuidae, first described in 1860 by Heinrich Benno Möschler (as Dianthoecia subdita). Its MONA number is 10356.[1]
The species occurs in north-eastern North America, where it has a mostly subarctic distribution across two disconnected ranges: one from Labrador, Quebec and Ontario to the western shore of Hudson Bay in Manitoba, and another limited to New Hampshire's White Mountains.
Adult specimens attracted to light and recorded in July.