Olethreutes ferriferana, commonly known as the Western Spruce Budworm, is a species of moth belonging to the family Tortricidae. It is found in western North America, primarily in coniferous forests. The adult moths have a wingspan of about 20-25 mm and are grayish-brown in color. The larvae of Olethreutes ferriferana feed on the buds and needles of spruce, fir, and other coniferous trees, causing defoliation and potentially significant damage to the host trees.