A Face Dancer is a type of human in Frank Herbert's science fiction Dune universe. A servant caste of the Bene Tleilax, Face Dancers are shapeshifters, and their name is derived from their ability to change their physical appearance at will.
Originally, Face Dancers were Tleilaxu trained to mimic others using acting and makeup, enhanced by plastic surgery. As time went on, the Tleilaxu began to use genetic manipulation to enhance natural ability in phenotypic plasticity, so that Face Dancers could change height, increase and decrease apparent mass, change coloring and texture, and change facial features.
Herbert describes Face Dancers in their natural state in Heretics of Dune:
The first Face Dancers Miles Teg ever saw: Two small men as alike as twins. Almost chinless round faces, pug noses, tiny mouths, black button eyes, and short-cropped white hair that stood up from their heads like the bristles on a brush.
In Dune Messiah, the Face Dancer Scytale notes, "We are Jadacha hermaphrodites ... either sex at will."