Athanasia Moustaka (Galaxidi, 27 December 1898 (according to others 1899) - Athens, 13 July 1968) was a Greek actress.

She was the daughter of the actor and troupe leader Dionysios Plessas. Moustaka was an important tragedian of the Greek theatre. Since the opening of the "National Theatre" in 1932, she was a key figure in it. She also collaborated with the "Hellenic Stage" directed by Dimitris Rontiris, in 1951 as well as with the troupe "Lampeti - Pappa - Horn" in the period 1952 - 1953. During the same period, she also appeared in Greek cinema. In cinema, she played supporting roles and four decades after her death, she was honored at an event of the S.E.I. for the actors who died between 1967 and 1974. In the film Modern Cinderella, she played the role of Aliki Vougiouklaki's grandmother. She died after suffering from pulmonary edema at the "Holy Cross" hospital. She was buried on a Sunday morning at the Third Cemetery of Athens.