450th

450th may refer to:


 * 450th Bombardment Group, an inactive United States Air Force unit formed in 1943 during World War II, inactivated in 1957.
 * 450th Bombardment Wing, an inactive United States Air Force unit, activated 1963 and inactivated in 1968.
 * 450th Expeditionary Flying Training Squadron (450 EFTS), a provisional United States Air Force unit assigned to the 322d Air Expeditionary Group
 * 450th Intelligence Squadron (450 IS), an intelligence unit located at Ramstein AB, Germany