Mary Coustas (Greek: ?a??a ???sta?; born 16 September 1964) is an Australian actress, comedian and television personality and writer.
Originally from Melbourne, Coustas often performs as the character "Effie", a stereotypical second-generation Greek Australian prone to malapropisms.
She completed a Bachelor of Arts at Deakin University in Melbourne, majoring in performing arts and sub-majoring in journalism.
Coustas won the Logie Award for Most Popular Comedy Personality in 1993.