Francis Arthur Freeth OBE FRS (2 January 1884 – 15 July 1970) was a British industrial chemist. He spent much of his career at Brunner Mond and its successor Imperial Chemical Industries, as chief chemist, research manager and in a recruiting capacity, with particular knowledge of phase rule chemistry, and developed many processes related to the manufacture of explosives. He made a critical contribution to the British World War I effort by devising new ways to manufacture ammonium nitrate, which was recognised with an honour, and a smaller contribution in World War II for the Special Operations Executive. Freeth created links between Brunner Mond and Dutch chemistry, particularly at the University of Leiden where he met Kammerlingh Onnes and was awarded a doctorate.