Penelope Marjorie Windust was an American television, film, and stage actress. She was known for her role as Kathleen Maxwell in the 1983 miniseries V.

Windust began her career on Broadway, appearing in a 1967 production of Spofford with Melvyn Douglas, and in 1972 production of Elizabeth I. Windust has starred in many television movies. Her best-known film roles were in the movies Ghost Town and Bird in 1988. Her final movie appearance was You Don't Mess with the Zohan in 2008.

She made many guest appearances on television, including Hawaii Five-O, The Six Million Dollar Man, Falcon Crest, Dallas, Matlock, Criminal Minds, ER, Third Watch and Boston Legal. She died on February 2, 2022, at the age of 76.