Robert Evans Greer (7 August 1915 – 11 February 1976) was a United States Air Force (USAF) officer who attained the rank of major general. A graduate of the United States Military Academy at West Point, New York, where he was ranked 175th in the class of 1939, he served in China and the Mariana Islands during World War II. After the war he served in the USAF Office of the Assistant for Atomic Energy and as vice commander of the Space Systems Division of the Air Force Systems Command.