Floyd Martin Thornton (often credited as F. Martin Thornton, November 4, 1884 – April 1, 1956) was an American screenwriter and film director active in the United Kingdom in the 1910s and 1920s. Born in 1884 in New Brunswick, New Jersey, he worked for some years in England. In 1915 he married the British actress Evelyn Boucher at Steyning in West Sussex. They had two sons, both born in England: Edward E. Martin (1916–2010) and Paul Mulford Martin (1921–1994). In 1925 he and his family left the UK for America, where they all remained for the rest of their lives.