Berghia marcusi is a species of sea slug, an aeolid nudibranch. It is a shell-less marine gastropod mollusc in the family Aeolidiidae.
This species is present in western Atlantic Ocean, from Florida to Jamaica and south to Brazil (Rio de Janeiro, São Paulo).
Berghia marcusi has a maximum reported size of 16.6 mm. It is a translucent white animal with a pattern of orange patches on the head and orange lines at the bases of the cerata.