John Shert was an English Catholic priest who was executed in 1582 during the reign of Queen Elizabeth I. Born at Shert Hall in Cheshire, he studied at Brasenose College, Oxford, before serving as a schoolmaster in London. After working in Douai, he entered the seminary and was eventually ordained at the English College in Rheims. He returned to England in 1579 to perform his ministry, which led to his arrest and subsequent trial for treason during a period of intense religious persecution.