Actor
Mariclare Costello
15 credited titles on WatchWise
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.
Mariclare Costello in one minute
Commercial performance
All figures are associated, not attributed — box-office numbers are sourced from TMDB and Wikipedia (reused under CC BY-SA), shown in US$, and weighted by billing prominence. Coverage varies by title; figures are estimates, not audited trade data.
What the numbers say
Worldwide gross by tagged contribution — US$. Tap a genre to see those titles.
Acted in (15)
Titles are ones WatchWise has catalogued so far — not necessarily a complete filmography.
