John Gerard (4 October 1564 – 27 July 1637) was a priest of the Society of Jesus who operated a secret ministry of the underground Catholic Church in England during the Elizabethan era.

He was born into the English nobility as the second son of Sir Thomas Gerard at Old Bryn Hall, near Ashton-in-Makerfield, Lancashire. After attending seminary and being ordained abroad, Gerard returned to England covertly shortly after the 1588 defeat of the Spanish Armada. Gerard not only successfully hid from the English authorities for eight years before his capture but also endured extensive torture, escaped from the Tower of London, recovered and continued with his covert mission until the exposure of the Gunpowder Plot made it impossible to continue.

After his escape to Catholic Europe, Gerard was instructed by his Jesuit superiors to write a book about his life in Latin. An English translation by Philip Caraman was published in 1951 as John Gerard: The Autobiography of an Elizabethan and is a rare first-hand account of the dangerous cloak-and-dagger world of a Catholic priest in Elizabethan England. Ignatius Press published a second edition in 2012 under the title The Autobiography of a Hunted Priest: John Gerard, S.J..

John Gerard was born 4 October 1564, the second son of Sir Thomas Gerard of Bryn Hall, and Elizabeth, daughter and co-heiress of Sir John Port of Derbyshire. In 1569, when John Gerard was five years old, his father was imprisoned for plotting the rescue of Mary, Queen of Scots, from Tutbury Castle. His release in 1571 may have been influenced by his cousin Sir Gilbert Gerard who was Attorney General at that time. During that time John and his brother were placed with Protestant relatives, but his father obtained for them a Catholic tutor.^{[citation needed]}

In August 1577, at age 12, he was sent to the English College at Douai, which relocated the following March to Rheims. At the age of 15 he spent a year at Exeter College, Oxford, which was followed by about a year of home-study of Koine Greek and Ecclesiastical Latin under a tutor, a Mr Leutner (Edmund Lewkenor, brother of Sir Lewes Lewknor Master of the Ceremonies to King James I). He then went to the Jesuit Clermont College in Paris. After some months there, followed by an illness and convalescence, in the latter part of 1581 he went to Rouen to see Jesuit priest Robert Persons.

As Gerard had left for Clermont without the requisite travel permit, upon his return to England, he was arrested by customs officials upon landing at Dover. While his companions were sent to London, he was released in the custody of a Protestant in-law. But after three months, having still not attended Anglican services, he was remanded to the Marshalsea prison. He spent a little over a year there in company with William Hartley, Stephen Rowsham, John Adams, and William Bishop. In the spring of 1585, Anthony Babington, who was later executed for treason for his involvement in a plot to free the Catholic Mary, Queen of Scots, posted bond to secure Gerard's release.

Gerard then went to Rome and was given another mission on behalf of the Jesuits to England. In November 1588, three months after the defeat of the Spanish Armada, Gerard and Edward Oldcorne landed in Norfolk to begin their task of sustaining Catholics among the English people. Having made his way to Norwich he met there the Lord of the Manor of Grimston, a Recusant called Edward Yelverton. After a two days’ journey on horseback, Gerard—now Mr. Thompson—settled down quietly in the Manor House at Grimston, 8 miles East of King's Lynn, as an honoured guest. He was in great danger, but his retreat was believed as safe as any south of the Humber.^{[citation needed]} Gerard was no ordinary man. He had indeed strange powers of attraction and fascination. He was introduced to the chief families of the neighbourhood, Walpoles and Woodhouses among others, and though only twenty-four he had extraordinary influence among them. His stay in Grimston lasted seven or eight months. After that he lived for some time at Lawshall, near Bury St Edmunds. Eventually, Gerard was taken to the leader of the English Jesuits, Father Henry Garnet. Gerard soon became a very popular figure in the Catholic underground. To stay above suspicion, Gerard cultivated a respectable public image. By way of disguises, he appeared very secular, being versed in gambling and wearing fashionable clothes. Gerard wrote of many escapes from the law and of occasions when he hid in priest holes, which could often be as small as 1 meter tall and half a meter wide. In 1591 Gerard became the chaplain to the Wiseman household, Braddocks, led by William and Jane Wiseman. The household included Jane Wiseman who was William's widowed mother. Gerard persuaded her to create a new home for herself and a chaplain at the Wisemans' dower-house of Bullocks (not to be confused with their main house which was called Braddocks) which would become as additional centre for Catholicism and priest harbouring.

Gerard was finally captured in London on 23 April 1594, together with Nicholas Owen. He was tried, found guilty and sent to the Compter in the Poultry. Later he was moved to the Clink prison where he was able to meet regularly with other imprisoned English Catholics. Due to his continuation of this work, he was sent to the Salt Tower in the Tower of London, where he was further questioned and tortured by being repeatedly suspended from chains on the dungeon wall. The main aim of Gerard's torturers was to find out the London lodgings of Henry Garnet, so that they could arrest him. However, Gerard refused to answer any questions that involved others, or to name them. He later insisted that he never broke down, a fact borne out by the files of the Tower.^{[citation needed]}