John Hewitt was an English Roman Catholic priest who lived during the late 16th century. After studying at Caius College, Cambridge, he moved to the English College in Reims, where he received minor orders in 1583. Following his ordination, he returned to England in 1586 using the alias Weldon. While serving as a disguised manservant, he was eventually apprehended at Gray's Inn and held in Newgate Prison, where he assisted a fellow prisoner during a medical procedure.