Oliver Duff Greene (January 25 1833 – March 19 1904) was an officer in the United States Army who served with the Union forces during the American Civil War. He graduated from the United States Military Academy at West Point in 1854 and received a commission in the artillery. During the war he held staff positions, notably as Major and Assistant Adjutant General of the VI Corps, and later was brevetted to the rank of brigadier general.
Greene was awarded the Medal of Honor for extraordinary heroism on 17 September 1862 at the Battle of Antietam in Maryland. The citation noted that he formed infantry columns under heavy fire and positioned them effectively during the engagement. The medal was conferred on 13 December 1893, several decades after the action.
After the Civil War Greene continued his service with the Adjutant General’s Department until his retirement in 1897. He died on 19 March 1904 in San Francisco, California, and is interred at the San Francisco National Cemetery. His career is documented in United States Army records and historical references such as the Medal of Honor archives and DBpedia entries derived from Wikipedia.