Barry K. Barnes (27 December 1906 – 12 January 1965) was a British film actor. He was born in London. He appeared in sixteen films between 1936 and 1947. He played Sir Percy Blakeney in the 1937 film Return of the Scarlet Pimpernel.

The Scarlet Pimpernel is a play and adventure novel by Baroness Emmuska Orczy, set during the Reign of Terror following the start of the French Revolution. The story is a precursor to the "disguised superhero" tales such as Zorro and Batman.

The play was produced and adapted by Julia Neilson and Fred Terry. It first opened on 15 October 1903 at Nottingham’s Theatre Royal; it was not a success. Terry, however, had confidence in the play and, with a rewritten last act, took it to London where it opened at the New Theatre on 5 January 1905. The premiere of the London production was enthusiastically received by the audience, but critics considered the play 'old-fashioned.' In spite of negative reviews, the play became a popular success, running 122 performances and enjoying numerous revivals. The Scarlet Pimpernel became a favourite of London audiences, playing more than 2,000 performances and becoming one of the most popular shows staged in England to that date.^{[citation needed]}

The novel was published soon after the play's opening and was an immediate success. Orczy gained a following of readers in Britain and throughout the world. The popularity of the novel encouraged her to write a number of sequels for her "reckless daredevil" over the next 35 years. The play was performed to great acclaim in France, Italy, Germany and Spain, while the novel was translated into 16 languages. Subsequently, the story has been adapted for television, film, a musical and other media.