John Hughes, Irish-American archbishop (d. 1864)
John Joseph Hughes (June 24, 1797 – January 3, 1864) was an Irish-born prelate of the Roman Catholic Church in the United States. He was the fourth Bishop and first Archbishop of the Archdiocese of New York, serving between 1842 and his death in 1864. In 1841, he founded St. John's College, which would later become Fordham University.

A native of Ireland, Hughes was born and raised in the south of County Tyrone. He emigrated to the United States in 1817, and became a priest in 1826 and a bishop in 1838. A figure of national prominence, he exercised great moral and social influence, and presided over a period of explosive growth for Catholicism in New York. He was regarded as "the best known, if not exactly the best loved, Catholic bishop in the country." He became known as "Dagger John," both for his following the Catholic practice wherein a bishop precedes his signature with a cross, as well as for his aggressive personality.