Arthur Otis Granger (February 14, 1846 – July 30, 1914) was an American industrialist and soldier. He manufactured and installed gasworks in Philadelphia and served as general manager of the United Gas Improvement Company, before serving as president of multiple fuel and gas light companies in the United States and Canada. He was later a mining engineer and railroad executive, and was reported to be a millionaire as of 1889. He established the Etowah Iron Company in Bartow County, had mining interests in South America, and was a business partner to Joseph M. Gazzam.