The 840th Air Division is an inactive United States Air Force organization. It was assigned to Ninth Air Force at Lockbourne Air Force Base, Ohio, where it was inactivated on 24 December 1969. The division's components provided tactical airlift support worldwide, and after 1965, trained Lockheed C-130 crews and maintenance personnel, primarily for deployment to the Pacific and participation in the Vietnam War. From July 1965 until June 1969, the air division's 840th Combat Support Group served as the host for all active duty Air Force units stationed at Lockbourne.