Lock Up Your Daughters! is a 1969 British comedy film directed by Peter Coe and starring Christopher Plummer, Susannah York and Glynis Johns. It is an adaptation of the 1959 stage musical of the same name set in 18th-century Britain, which in turn is based on the 1730 comedy, Rape upon Rape, by Henry Fielding. It lacks all the songs from the original stage production. It was one of a number of British costume films released in the wake of the success of the 1963 film Tom Jones.