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 Tom Jones (1963).

Arthur Christopher Orme Plummer was a Canadian actor. His career spanned seven decades, gaining him recognition for his performances in film, stage, and television. His accolades included an Academy Award, two Tony Awards, and two Primetime Emmy Awards, making him the only Canadian recipient of the "Triple Crown of Acting". He also received a BAFTA Award, a Golden Globe Award, and Screen Actors Guild Award as well as a nomination for a Grammy Award.