Harry Charles Kelly (9 October 1908—2 February 1976) was an American physicist best known for his role in Japan in the aftermath of World War II in preserving scientific research not related to weaponry. He forged enduring relations between the U.S. and Japanese scientific communities, recognized by the Japanese government. Upon his death in 1976, the Japanese government requested a portion of his remains be buried in Japan. He is the subject of a biography, Science has No National Borders: Harry C. Kelly and the Reconstruction of Science and Technology in Postwar Japan, and a documentary broadcast on Japanese television.