Derrick Raoul Edouard Alfred De Marney (21 September 1906 – 18 February 1978) was an English stage and film actor and producer, of French and Irish ancestry.

It was his performance in the lead role of the play Young Mr Disraeli at the Kingsway and Piccadilly theatres that brought him the offer of a long term film contract from Alexander Korda.

[2] He is perhaps best remembered for his starring role as Robert Tisdall, falsely accused of murder in Alfred Hitchcock's Young and Innocent (1937).

[3] Other early film roles include Benjamin Disraeli, this time in Victoria the Great (1937) and its sequel, Sixty Glorious Years (1938).

[3] He also produced and starred in the thrillers Latin Quarter (1945), She Shall Have Murder (1950), and Meet Mr. Callaghan (1954), a role he had created on stage.