Joan Greenwood (4 March 1921 – 28 February 1987) was an English actress. Born in Chelsea, she studied at the Royal Academy of Dramatic Art. Her husky voice, coupled with her slow, precise elocution, was her trademark. She may be best remembered for her role as Sibella in Kind Hearts and Coronets (1949).
Greenwood worked mainly on the stage, where she had a long career, appearing with Donald Wolfit's theatre company in the years following the Second World War.
Greenwood made regular several memorable screen appearances just after the war, in Ealing Comedies, in Whisky Galore!; as the seductive Sibella in the black comedy Kind Hearts and Coronets (1949); and in The Man in the White Suit (1951). She opened The Grass is Greener in the West End in 1952, and played Gwendolyn in a film version of The Importance of Being Earnest released in the same year.
She had leading roles in Stage Struck (1958), an adaptation of Jules Verne's Mysterious Island (1961) and Tom Jones (1963).