Leonard Michael Greene (June 8, 1918 – November 30, 2006) was an American inventor and aerodynamics engineer who held more than 200 patents, many of which are aviation-related. He is most well known for his contributions to aviation technology, including his invention, the Aircraft Stall Warning device, which warns pilots when a deadly aerodynamic stall is imminent. To build the device, Greene established the Safe Flight Instrument Corporation in 1946.

Apart from his inventive life, Greene also served as the founder and president of the Institute for Socioeconomic Studies, a think tank to address issues such as poverty and social awareness. Additionally, he co-founded the Corporate Angel Network, a charitable organization that flies patients in corporate aircraft. In 1991, he was inducted into the National Inventors Hall of Fame. Greene died on November 30, 2006 at the age of 88 in Mamaroneck, New York. The cause was complications from lung cancer.