Hellinsia simplicissimus is a moth of the family Pterophoridae that is endemic to the U.S. state of California. The wingspan is . The forewings are pale creamy, shaded lightly with light brownish, more particularly in costal area, the inner margin and second lobe remaining pale. The hindwings are pale smoky white with paler fringes. References simplicissimus Moths described in 1938 Endemic fauna of California Moths of North America Fauna without expected TNC conservation status