Marianna Toumassatou (Greek: Μαριάννα Τουμασάτου; born December 6, 1967) is a Greek television and stage actress.
Toumassatou was born in Athens, but hails from the Greek island of Kefalonia. She graduated from "Karolos Koun" drama school in 1991.
Toumassatou has participated in various theatrical plays, such as Aristophanes' Iphigenia in Aulis and The Clouds, and a theatrical adaptation of Victor Hugo's Les Misérables, as well as in television series', such as in the critically acclaimed soap opera Vera sto Dexi, which made her popularity rise. Her first appearance on television was on the series Ginekes (1991).