Cloudburst is a 1951 British crime drama film produced by Hammer Films, directed by Francis Searle, starring Robert Preston and featuring Elizabeth Sellars, Harold Lang, Colin Tapley and Sheila Burrell. The script, by Searle and Leo Marks, is based on the play of the same name by Marks, a wartime cryptographer for the Special Operations Executive, and later the author of a memoir about his wartime work, Between Silk and Cyanide (1998).