Mary McEvoy (born 1954) is an Irish actress. She is recognised by television viewers for having played the role of Biddy Byrne in Glenroe from 1983-2000. After that she has been in numerous plays, including Big Maggie, Sive, The Field, The Chastitute, The Vagina Monologues, Shirley Valentine, The Matchmaker, The Year of the Hiker, Dancing at Lughnasa, Whippy, The Life and Times of Selma Mae, Moonlight and Music and Jo Bangles. She is also noted for her washing powder advertisements on television.