Edith Marie Blossom MacDonald (August 21, 1895 – January 14, 1978), also known as Blossom Rock, was an American actress. Her younger sister was actress and singer Jeanette MacDonald. Rock is probably best known for her role as "Grandmama" on the 1960s horror sitcom The Addams Family.
Rock was born in Philadelphia, Pennsylvania. She died of a stroke on January 14, 1978 in Los Angeles, aged 82.