The Serene Underwing (Catocala serena) is a moth of the Erebidae family. It is found from southern Ontario, New York, New Jersey, Connecticut, as far south as to at least Tennessee, and west to Pennsylvania, Illinois and at least as far west as eastern Wisconsin. The wingspan is 55–60 mm. Adults are on wing from July to September depending on the location. There is probably one generation per year. The larvae feed on Carya ovata and Juglans nigra.