Berghia marcusi is a species of sea slug, an aeolid nudibranch.

It is a shell-less marine gastropod mollusc in the family Aeolidiidae.

[2] This species is present in western Atlantic Ocean, from Florida to Jamaica and south to Brazil (Rio de Janeiro, São Paulo).

[3] Berghia marcusi has a maximum reported size of 16.6 mm.

[3] It is a translucent white animal with a pattern of orange patches on the head and orange lines at the bases of the cerata.