Selina Cadell (born 21 June 1953, London) is an English actress. She is the younger sister of actor Simon Cadell and granddaughter of actress Jean Cadell.
Cadell has been appearing on British television, film, and theatre over the last thirty years. She has taken on a wide range of supporting and leading roles. Recently, she has played Dorothy Crowther in The Amazing Mrs Pritchard; Mrs Tishell in Doc Martin; and the Dean Mieke Miedema in Lab Rats. She appeared in Sam Mendes' Broadway production of Anton Chekhov's The Cherry Orchard, and played Maria in Mendes' highly acclaimed production of Twelfth Night for the Donmar Warehouse (London and New York). She had a starring role in the 2013 film The Lady Vanishes.
In 2013, she appeared as both Sister Gregory, a Roman Catholic nun, in the Father Brown episode "The Bride of Christ", and "Miss Froy", the title character in a television remake of The Lady Vanishes, directed by Diarmuid Lawrence from an updated screenplay by Fiona Seres.