John Thornton (October 8, 1641 - January 23, 1708) was a British chartmaker, sea captain, publisher and engraver active in London during the late 18th and early 19th centuries. Thornton apprenticed to John Burston where mastered the art of manuscript maritime cartography as practiced by the Thames School. By the 1660s Thornton, working with John Seller and William Fisher, began publishing printed nautical charts and was the only Thames School cartographers to successfully transition to print. Thornton published numerous maps both independently and with some of the most prominent British publishers of his day, including the aforementioned as well as Herman Moll, Robert Morden, James Clark, Robert Greene, and Philip Lea. From around 1665 Thornton took over from Seller the production of the English Pilot. Upon his death in 1708 Thornton willed his charts, copper plates, instruments, and 'all things belonging to my calling' to his son, Samuel Thornton, who continued to republished his father's work, with few updates, until about 1715.