Penelope Anne Constance Keith, CBE, DL (née Hatfield; born 2 April 1940) is an English actress.
Having started her television career in the 1950s, Penelope Keith became a household name in the United Kingdom in the 1970s when she played Margo Leadbetter in the sitcom The Good Life. This role earned Keith her first of two BAFTA Awards, the second being in 1978 for The Norman Conquests. One year after The Good Life‘s finale, Keith was the lead character in another BBC sitcom, To the Manor Born, a show that received audiences of more than 20 million. In the 1980s and 1990s, she appeared as the lead character in six other sitcoms. Since the 1990s, Keith has appeared rarely on television and works mainly in the theatre.