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 ForceGround 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 Infantry Regiment (Imperial Japanese Army), part of the 355th Division (Imperial Japanese Army) * 355th Rifle Division, a Soviet WWII infantry divisionSee also
* 355 (number) *