Sympistis anweileri is a moth of the family Noctuidae first described by James T. Troubridge and J. Donald Lafontaine in 2008.[1] It is found in western North America from Alberta to British Columbia to Montana at altitudes of 2,000 to 8,000 feet.[2]
It is found in mountainous areas, from the tree-line to valleys, as well as in dry forests.
The wingspan is 30–36 mm. Adults are on wing from mid-July to late August.[2]