William Hart was a 16th-century English Catholic priest who was executed in York. Born in Wells in 1558, he studied at Lincoln College, Oxford, before moving to Douai College and later being ordained in Rome in 1579. Upon returning to England, he served the Catholic community in Yorkshire, offering support to those in prison. His ministry led to his arrest following a betrayal on Christmas Day in 1582, eventually resulting in his death for his religious activities.