William Barrow (alias Waring, alias Harcourt) (1609 – 30 June 1679) was an English Jesuit, executed as a result of the fictitious so-called Popish Plot, that between 1678 and 1681 gripped the Kingdoms of England and Scotland in anti-Catholic hysteria. Barrow is regarded as a martyr of the Roman Catholic church and was beatified in 1929.