Mona Washbourne (27 November 1903 – 15 November 1988) was an English actress of stage, film and television.
Mona Washbourne was born in Birmingham, Warwickshire, and began her entertaining career training as a concert pianist. Her sister Katherine Washbourne was a violinist with the BBC Symphony Orchestra under Sir Adrian Boult.
Washbourne was performing professionally from the early 1920s. She married the actor Basil Dignam. Her brother-in-law Mark Dignam was also a stage and film actor. In 1948, after numerous stage musical performances, Washbourne began appearing in films. Her film credits include Billy Liar (1963) and The Collector (1965). She played Mrs. Pearce in My Fair Lady (1964), the stern and caustic Mrs. Bramson in the remake of Night Must Fall (also 1964), and the Matron in the film, If.... (1968).
She appeared at both the Royal Court Theatre in London and on Broadway in 1970 in David Storey's Home. She was nominated for the Tony Award for Best Performance by a Featured Actress in a Play. In 1975 she appeared on the West End stage with James Stewart in a revival of Mary Chase's play Harvey, in the role originally taken by Josephine Hull. Washbourne won the 1981 New York Film Critics' Circle Awards for Best Supporting Actress in Stevie (1978).