Harold Wayne Greenhaw (February 17, 1940 – May 31, 2011) was an American writer and journalist. The author of 22 books who chronicled changes in the American South from the civil rights movement to the rise of a competitive Republican Party, he is known for his works on the Ku Klux Klan and the exposition of the My Lai Massacre of 1968. Greenhaw wrote for various Alabamian newspapers and magazines, worked as the state's tourism director, and was considered "a strong voice for his native state".