Herbert Alfred Henry Joseph Thomas Vaughan was an English prelate of the Catholic Church. He served as Archbishop of Westminster from 1892 until his death in 1903, and was elevated to the cardinalate in 1893. He was the founder in 1866 of St Joseph's Foreign Missionary Society, known best as the Mill Hill Missionaries. He also founded the Catholic Truth Society and St. Bede's College, Manchester. As Archbishop of Westminster, he led the capital campaign and construction of Westminster Cathedral.

The Mill Hill Missionaries (MHM), officially known as the Saint Joseph's Missionary Society of Mill Hill, is a Catholic society of apostolic life founded in 1866 by Herbert Alfred Vaughan, MHM, later Cardinal Vaughan.