Parides gundlachianus, the Cuban cattleheart, is a species of butterfly in the family Papilionidae. It is an endemic species found only in Cuba. The name honours the Cuban naturalist Juan Gundlach. It is the brightest-coloured American swallowtail, and may be recognised by the brilliant blue bands on the forewing. The dark ash-grey larva is striped longitudinally, the head and thoracic legs are black; the black longitudinal stripes in part margined with white; the anterior and posterior segments bear long pointed tubercles which are partly white.