Acronicta impressa, the impressive dagger moth or willow dagger moth, is a moth of the family Noctuidae. The species was first described by Francis Walker in 1856. It is found from western Canada to north-western Mexico. The wingspan is about 38 mm. Adults are on wing from early to midsummer depending on the location. Recorded food plants include bitterbrush, rose, aspen, poplar and willow.