Eirini Koumarianou (Greek: Ειρήνη Κουμαριανού, 1930/1931 – 25 January 2013) was a Greek actress whose career began in 1951.

Koumarianou was born in Galatsi, Athens. She studied at the Greek Conservatory and starred in several plays, mainly at the National Theatre, which included several ancient tragedies, mainly by Epidaurus. She co-starred, with Alice Vougiouklaki, Jenny Karezi, Rena Vlachopoulou and others, during her career. Her film credits included History of Life, Girls on kissing (1965), Tears for Electra (1966), Too late for tears, Captain jack baton (1968), The fairy and the lad (1969), The aristocrat and the Tramp, I pity the stature (1970), The rascal, The efoplistina (1971), Mary of Silence, The constellation of the virgin (1973).