434th

434th may refer to:


 * 434th Air Refueling Wing, one of the key refueling units in the US Air Force Reserve
 * 434th Bombardment Squadron, an inactive United States Air Force unit
 * 434th Fighter Training Squadron (434 FTS), part of the 47th Flying Training Wing based at Laughlin Air Force Base, Texas
 * 434th Operations Group, an active United States Air Force Reserve unit