355th may refer to:
Aviation 355th Fighter Squadron, an inactive United States Air Force unit 355th Fighter Wing, a United States Air Force unit assigned to the Air Combat Command's Twelfth Air Force 355th Tactical Airlift Squadron, a U.S. Air Force squadron based at Rickenbacker Air National Guard Base 355th Troop Carrier Squadron, an inactive United States Air Force unit 355th Operations Group, a United States Air Force unit, assigned to the 355th Wing 355th Aviation Company, of the United States Army No. 355 Squadron RAF, WWII long range bombing squadron of the British Royal Air Force 355th Reconnaissance Aviation Squadron, a Cold War era unit of the Yugoslav Air Force
Ground forces 355th Infantry Regiment (United States), an infantry regiment of the United States Army 355th Division (Imperial Japanese Army), a WWII home defence infantry division 355th Rifle Division, a Soviet WWII infantry division
See also
355 (number) 355, the year 355 (CCCLV) of the Julian calendar 355 BC
355 (disambiguation)