The New York Times reported her death Friday.
The New York native was nominated for a best actress Oscar in 1978 for "An Unmarried Woman" and in 1979 for "Starting Over."
Her film credits include "Silver Streak," "Semi-Tough," "First Monday in October" and "I'm Dancing as Fast as I Can." She appeared on TV's "Law & Order," "The Practice" and "Nip/Tuck," had a recurring role on "Ally McBeal" as Ally's mother and was a cast member of "Dirty Sexy Money." She was an accomplished stage actress, as well.
Clayburgh and Rabe married in 1978.
In addition to the playwright, the actress is survived by a daughter, the actress Lily Rabe; a son, Michael; a stepson, Jason; and a brother, James, The Times noted.