Frank Launder (January 28 1906 — February 23 1997) was an English writer, director and producer, who made more than forty films, many of them in collaboration with Sidney Gilliat. He was born in Hitchin, Hertfordshire, England and began working as a screenwriter on British films in the 1930s, contributing the story for the classic Will Hay comedy Oh, Mr Porter! (1937). After writing a number of screenplays with Gilliat, including The Lady Vanishes (1938) and Night Train to Munich, the two produced and directed the wartime drama Millions Like Us (1943). After founding their own production company Individual Pictures, they produced a number of memorable dramas and thrillers including I See a Dark Stranger (1945) and Green for Danger (1946), but were best known for their comedies including The Happiest Days of Your Life (1950) and most famously, the St Trinians series, based on Ronald Searle's cartoons set in an anarchic girls school. He was married to actress Bernadette O'Farrell from 1950 until his death.

Frank Launder started as a scriptwriter in the 1930's on such classics as The Lady Vanishes (1938) and Night Train to Munich (1940). He joined forces with Sidney Gilliat and together they Wrote, Directed and Produced over 40 films. Frank Launder and Sidney Gilliat are most famous for their St. Trinian's films.