Her family said in a statement that she passed November 28 at her Beverly Hills home, the Associated Press reports.
Lord appeared in many films and stage productions, but was best known for her role as Kathy "Clancey" Williams on the sitcom Make Room for Daddy, on which she appeared from 1957 to 1964.
After retiring from acting in the late '80s, Lord dedicated her time to arts philanthropy. She founded the Scripter Award, which honors authors of books and the screenwriters who adapt them.
Her surviving family includes a daughter, actress Anne Archer, and a grandson, former Church of Scientology official Tommy Davis.