A priest hunter was a person who, acting on behalf of the English and later British government, spied on or captured Catholic priests during Penal Times. Priest hunters were effectively bounty hunters. Some were volunteers, experienced soldiers or former spies.

Edmund Campion, SJ was an English Jesuit priest and martyr. While conducting an underground ministry in officially Anglican England, Campion was arrested by priest hunters. Convicted of high treason, he was hanged, drawn and quartered at Tyburn. Campion was beatified by Pope Leo XIII in 1886 and canonised in 1970 by Pope Paul VI as one of the Forty Martyrs of England and Wales. His feast day is celebrated on 1 December.