John G. Castles

John Glover Castles (January 1, 1925 – June 18, 2001) was a United States Army major general and former Adjutant General of Virginia.

Born in East Orange, New Jersey, Castles graduated from the Valley Forge Military Academy in 1943. He enlisted in the U.S. Army in May 1943 and was commissioned in 1944 after completing Infantry Officer Candidate School. Castles served in combat with the 345th Infantry, 87th Infantry Division, 3rd Army in Europe during World War II.

After being discharged from active duty on April 15, 1946, Castles enrolled at the University of Virginia and earned a B.S. degree in 1950. He later completed courses at the United States Army Command and General Staff College in 1960 and 1964. and served as commander of the 116th Infantry Brigade (Separate) from 1977 to 1979. He was appointed adjutant general in August 1982 and confirmed as a major general on February 24, 1983.