Mariclare Costello (gebore 3 Februarie 1936) is 'n Amerikaanse aktrise. Sy is bekend vir haar rolle in die rolprente Let's Scare Jessica to Death (1971), Ordinary People (1980), The Adventures of Buckaroo Banzai Across the 8th Dimension (1984), en Indecent Proposal (1993). 1970: Pound 1971: Let's Scare Jessica to Death 1980: Ordinary People 1984: The Adventures of Buckaroo Banzai Across the 8th Dimension 1993: Indecent Proposal 1975: Sunshine 1977: The Fitzpatricks 1972: Going Where I've Never Been: The Photography of Diane Arbus 1974: After the Fall 1974: The Execution of Private Slovik 1977: A Sensitive, Passionate Man 1980: The Boy Who Drank Too Much 1981: Coward of the County 1982: Skeezer 1985: Heart of a Champion: The Ray Mancini Story 1987: American Harvest 2000: Shadow of the Blair Witch 2011: Assisted Loving Mariclare Costello in die Internet-rolprentdatabasis