Oliver Duff (or Davis) Greene (January 25, 1833 – March 19, 1904) was a Union officer who received the Medal of Honor on December 13, 1893 for his action at the Battle of Antietam on September 16, 1862.Born in Scott, New York, Greene graduated from West Point in 1854, receiving his commission in the artillery. A staff officer for most of his career, he served as Adjutant-General of VI Corps during the Maryland Campaign. A Major at war´s end, he was brevetted to Brigadier General in March 1865.