John Duckett was a 17th-century English Catholic priest who was executed at Tyburn. Born in Sedbergh, Yorkshire, he was educated at the English College in Douai before being ordained in 1639. Following further studies in Paris, he returned to England to serve the Catholic community during the English Civil War. While traveling to perform a baptism in County Durham, he was apprehended by Parliamentary soldiers, leading to his eventual martyrdom alongside his companion, Ralph Corby.