William Hartley (born at Wyn, in Derbyshire, England, of a yeoman family about 1557; executed at Tyburn, 5 October 1588) was an English Roman Catholic priest. He is a Catholic martyr, beatified in 1929.
At eighteen he matriculated at St. John's College, Oxford, where he became a chaplain. Being ejected by the vice-chancellor, Tobias Matthew, in 1579, he went to Reims in August, was ordained at Châlons, and returned to England in June, 1580.
Hartley helped Robert Parsons and Edmund Campion in printing and distributing their books in England. On 4 August 1581 a search of Stonor Park in Oxfordshire found the press on which Campion's Decem Rationes had been printed. Hartley, along with members of the Stonor family, printers and some servants, were arrested at Stonor Park. Hartley was sent to Marshalsea Prison, London. Here he was detected saying Mass in a cell before Lord Vaux, and for this he was laid in irons on 5 December, 1583.
He was indicted for high treason, 7 February, 1584, but for some reason, not tried. In January, 1585, he was sent into exile. He then spent some little time at Reims, recovering his health, and made a pilgrimage to Rome on 15 April, 1586, before returning to the English mission.
Less is known of Hartley's companions.
- John Hewitt was son of a draper at York and a student at Caius College, Cambridge. He had once been in York prison, but was arrested in Grey's Inn Lane, London, 10 March, 1857, going under the name of Weldon, and died under that name; this had led several early martyrologists into the mistake of making him into two martyrs, Hewett dying at York, and Weldon at London.
- Robert Sutton was a tutor or schoolmaster, born at Kegworth in Leicestershire, who had practiced his profession in Paternoster Row, London.
- John Harrison, alias Symons, had carried letters from one priest to another. As he had before "been slandered to be a spy" we can guess why his fame suffered some obscurity. It is also hardly doubtful that his name, Harrison, was confounded with that of either Matthias or James Harrison, priests, who suffered martyrdom in 1599 or 1602 respectively. This perhaps explains why his name has fell out of the process of the English martyrs, and in its place was inserted that of Richard Williams, a "Queen Mary priest" who really suffered four years later.
- Charles Boase, Oxford registers, (Oxford, 1885-89), II, ii, 68
- Catholic Records Society (London, 1906, 1908), II, V
- Richard Challoner, Memoirs, I
- Joseph Gillow, Bibl. Dict. Eng. Cath., s. v.
- Jaeffreson, Middlesex County Records (London, 1886), II, 171, 180
- Lobel, Mary D. (1964). A History of the County of Oxford: Volume 8: Lewknor and Pyrton Hundreds. p. 98–115.
- The Month, January, 1879, 71-85; January, 1905, 19
- John Hungerford Pollen, Acts of English Martyrs (London, 1891)