Mariclare Costello
- Known for
- Acting
- Born
- February 6, 1936, Peoria, Illinois, USA
- Died
- April 17, 2026
- Movies
- 24
Mariclare Catherine Costello (February 3, 1936 – April 17, 2026) was an American actress. She was a lifetime member of The Actors Studio. Costello's most notable role was that of Rosemary Hunter Fordwick on the television series The Waltons, from 1972 to 1977. In 1977, after her role on The Waltons, she played matriarch Maggie Fitzpatrick on the short-lived drama show The Fitzpatricks.
Best-Known Movies
Indecent Proposal
1993
Ordinary People
1980
The Adventures of Buckaroo Banzai Across the 8th Dimension
1984
Let's Scare Jessica to Death
1971
Nightmares
1983
Raid on Entebbe
1976
Shadow of the Blair Witch
2000
The Execution of Private Slovik
1974
Coward of the County
1981
Victims for Victims: The Theresa Saldana Story
1984
Filmography
| 2000 | Shadow of the Blair Witch | Kathy Patterson |
| 1993 | Indecent Proposal | David's Mother |
| 1990 | She Said No | Susan Finn |
| 1990 | Appearances | Rose |
| 1987 | American Harvest | Mary Alice Duncan |
| 1985 | Heart of a Champion: The Ray Mancini Story | Ellen Mancini |
| 1984 | Victims for Victims: The Theresa Saldana Story | Jane Bladow |
| 1984 | The Adventures of Buckaroo Banzai Across the 8th Dimension | Senator Cunningham |
| 1983 | Nightmares | Adele Cooney (segment "The Bishop of Battle") |
| 1982 | Skeezer | Barbara Thompson |
| 1981 | Coward of the County | Emma Spencer |
| 1980 | Ordinary People | Audrey |
| 1980 | All God's Children | Winnie Naponic |
| 1980 | The Boy Who Drank Too Much | Louise Carpenter |
| 1977 | A Sensitive, Passionate Man | Pat Morris |
| 1976 | Raid on Entebbe | Gabrielle Krieger |
| 1976 | Territorial Men | Julia Baker |
| 1975 | Conspiracy of Terror | Mrs. Warnall |
| 1974 | After the Fall | Louise |
| 1974 | The Gun | Beryl Strauss |
| 1974 | The Execution of Private Slovik | Antoinette Slovik |
| 1972 | Going Where I've Never Been: The Photography of Diane Arbus | Herself - Narrator |
| 1971 | Let's Scare Jessica to Death | Emily |
| 1970 | Pound | Honky Killer's Wife |
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