Battus lycidas is a species of butterfly in the family Papilionidae native to the Americas. It is commonly known as Cramer's Swallowtail, the Lycidas Swallowtail, and the Yellow-trailed Swallowtail. Little is known about this species, but it is not considered threatened. It is found from Mexico to northern Bolivia and southern Pará, Brazil. It is rare in Costa Rica. The larvae feed on Aristolochia huberiana.