Bacchis (4th-century BC) was a Greek hetaira.
She was originally the slave of the hetaira Sinope, lover of Harpalos, who trained her as a hetaira. She was manumitted and eventually became the owner of the hetaira Pythionike.
Bacchis was a famous hetaira and the object of many anecdotes. She is generally praised for her good nature and became a stereotype of a "good courtesan". She was the subject of several popular plays, among them plays by Epigenes and Sopatros of Phakos. She was also a sender and receiver of several of the fictive letters of Alciphron.