Frank Percy Doel (14 July 1908 – 22 December 1968) was a British antiquarian bookseller for Marks & Co in London who achieved posthumous fame as the recipient of a series of humorous letters from American author Helene Hanff, to which he scrupulously and, at first, very formally replied. The shop where he worked was at 84 Charing Cross Road, the title of a bestselling 1970 book written by Hanff which became a cult classic, a 1981 stage play, and a 1987 film starring Anthony Hopkins as Doel and Anne Bancroft as Hanff.