Catocala herodias, the Herodias underwing or Gerhard's underwing, is a moth of the family Erebidae.

The nominate form is found in the US states of Texas and Oklahoma.

Subspecies Catocala herodias gerhardi is found from Massachusetts, Connecticut, New York to Virginia.

The gerhardi subspecies is listed as endangered in Connecticut.

Adults are on wing from July to August depending on the location.