The Ilia Underwing, Beloved Underwing or Wife Underwing is a moth of the family Erebidae. The species can be found in the Eastern part of the United States as well as southern Canada. Subspecies ''Catocala ilia zoe'' can be found in California and Arizona.
The wingspan is 65–82 mm. A spot on its forewing with a distinct white circle encompasses it distinguishes this moth from others in the same family. Otherwise, the forewing can be extremely variable. The underwing that it is named for can range in color from light orange to a deep red. The moths flies from June to September depending on the location.
The larvae feed on Oak, including black, burr, red, and white oaks.
*''Catocala ilia ilia'' ⤷ ''Catocala ilia zoe'' Behr, 1870
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