The 18th Intelligence Squadron is an intelligence organization of the United States Air Force, located at Buckley Space Force Base, Colorado.
 The squadron delivers decision advantage through strong mission partnerships to the air component, the joint force, and the United States by growing tactically brilliant Airmen, developing information warfare capabilities, and driving innovation.
 The squadron was originally activated as the 5th Photographic Laboratory Section on 20 October 1943 at Will Rogers Field, Oklahoma. While training at Esler Field, Louisiana, it was redesignated as the 5th Photographic Technical Unit on 30 November 1944 and as the 18th Photographic Technical Unit on 29 January 1945.
 The 18th moved overseas in the spring of 1945, arriving in Nancy/Azelot Airfield, France, little more than a month before V-E Day, on 22 March 1945.   It was inactivated on 27 December 1945 at Bad Kissingen Airfield, Germany. In these early years, the unit served in the United States, France, and Germany.
 The 68th Reconnaissance Technical Squadron was activated on 10 October 1951 at Lockbourne Air Force Base, Ohio as an original element of the 68th Strategic Reconnaissance Wing, which was located at Lake Charles Air Force Base, Louisiana, and began to equip with Boeing B-29 Superfortresses borrowed from other units.  However, before the end of the year, Strategic Air Command decided to change the 68th Wing mission to bombardment and the squadron was inactivated on 10 December 1951.
 On 16 October 1984, the 18th Photographic Technical Unit and the 68th Reconnaissance Technical Squadron were consolidated as the 18th Reconnaissance Technical Squadron, but the consolidated unit remained inactive.  It was redesignated the 18th Intelligence Squadron on 3 September 1993 and activated on 7 September 1993 at Falcon Air Force Base, Colorado, drawing its personnel and equipment from a detachment of a United States Air Force Security Service unit, which was discontinued.
 The squadron's Detachment 1 was organized at Holloman Air Force Base, New Mexico in June 1995, and moved to Wright-Patterson Air Force Base, Ohio during the summer of 2000.  Detachment 1 was the Air Intelligence Agency's only transportable system conducting radio frequency phenomenology studies. Detachment 1 was discontinued on 8 June 2010 and merged with the 18th Intelligence Squadron, which moved from Vandenberg Air Force Base, California to Wright-Patterson. Assigned personnel provide data in support of Air Force Intelligence, Surveillance, and Reconnaissance Agency, National Air and Space Intelligence Center, and United States Strategic Command missions as well as information critical to the National Security Agency and other national-level organizations.
 The squadron provided intelligence for the planning, development, and execution of space control operations. The squadron consisted of a headquarters element at Wright-Patterson Air Force Base, Ohio and two geographically separated detachments: Detachment 2, Osan Air Base, Korea; and Detachment 4, RAF Feltwell, United Kingdom.
 The 18th was assigned to the 544th Intelligence, Surveillance and Reconnaissance Group, of Twenty-Fifth Air Force of Air Combat Command.  Through fixed and mobile sites, it provided scientific and technical collection to National Security Agency, Air Force Materiel Command, and the 21st Space Wing, Passive Space Surveillance mission. Where available, it also provided limited analysis to the entities.
 The squadron INactivated during September 2020 and then reactivated as the US Space Force's 73rd Intelligence, Surveillance and Reconnaissance Squadron which assigned to Space Delta 7.
 On 26 September 2022, the 18th Intelligence Squadron was reactivated as a part of the 544th Intelligence, Surveillance and Reconnaissance Group with the headquarters relocating to Buckley Space Force Base, Colorado under the command of Major Ryan Laine. 
 Wright-Patterson Air Force Base, Ohio, (31 Aug 2000 – 8 June 2010)
Griffiss Air Force Base, New York, 7 September 1993 – 31 August 2000
  This article incorporates public domain material from the Air Force Historical Research Agency.