Regency Buck is a novel written by Georgette Heyer. It has three distinctions: it is the first of her novels to deal with the Regency period; it is one of only a few to combine both genres for which she was noted, the Regency romance and the mystery novel; and it is the only one of her Regency stories to feature Beau Brummell as an actual character, rather than as someone merely mentioned in passing. The story is set in 1811-1812.