Marion Ross ( born October 25 , 1928 ) is an American actress best known for her role as Marion Cunningham on the ABC television series `` Happy Days '' from 1974 to 1984 .
Marion Ross ( born Marian Ross October 25 , 1928 ) is an American movie , voice , stage , and television actress who is best known for her role as Marion Cunningham on the television series `` Happy Days '' from 1974 to 1984 .