William Barrow (alias Waring, alias Harcourt) (1609 – 30 June, 1679) was an English Jesuit, executed as a result of the Popish Plot, a fabricated story. He is a Catholic martyr, beatified in 1929. By a papal decree of 4 December, 1886, this martyr's cause was introduced, but under the name of "William Harcourt". This is the official name of beatification.