| First Name | Mariclare |
| Last Name | Costello |
| Full Name at Birth | Mariclare Costello |
| Age | 76 |
| Date of Birth | February 3, 1936 |
| Birthplace | Peoria, Illinois |
| Height | 5' 4" (163 cm) |
| Build | Average |
| Hair Color | Blonde |
| Star Sign | Aquarius |
| Ethnicity | White |
| Nationality | American |
| Occupation Category | Actress |
| Claim to Fame | The Waltons |
Mariclare Costello (born February 3, 1936 in Peoria, Illinois) is a television, stage, and movie actress. Her most notable role was 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. Her first film appearance was The Tiger Makes Out (1967). In 1970 she appeared on stage in "Harvey" at the ANTA Theatre in New York City. She is also well remembered for her role as a hippie-vampire in the 1971 cult horror film Let's Scare Jessica to Death.
Selected Mariclare Costello film and TV show credits: