Harry Donald Schultz (September 11, 1923 – February 22, 2023) was an American investment adviser and author who published The International Harry Schultz Letter for 45 years. He learned to trade while serving in the United States Army in Shanghai and on his return to the US bought and sold small newspapers, 13 in all. He spent the rest of his career advising on investments and writing books and his eponymous newsletter. Schultz was closely associated with libertarian causes.