Oakley Maxwell Hall (July 1, 1920 – May 12, 2008) was an American novelist. He was born in San Diego, California, graduated from the University of California, Berkeley, and served in the Marines during World War II. Some of his mysteries were published under the pen names "O.M. Hall" and "Jason Manor." Hall received his Master of Fine Arts in English from the Iowa Writers' Workshop at the University of Iowa.