366th may refer to:
366th Bombardment Squadron, inactive United States Air Force unit 366th Division (IDF), also known as the "Path of Fire" Division, a reserve armored division of the IDF 366th Fighter Squadron, inactive United States Air Force unit 366th Fighter Wing, 366th Fighter-Bomber (later, 366th Operations), in the United States Air Force Air Combat Command 366th Infantry Regiment (United States), African American (segregated) unit of the United States Army, served with distinction in both World Wars 366th Motor Rifle Regiment or 7th Guards Cavalry Corps of the Soviet Union's Red Army was a cavalry corps active during the Second World War 366th Operations Group, the flying component of the 366th Fighter Wing, assigned to the United States Air Force Air Combat Command
See also 366 (number) 366, the year 366 (CCCLXVI) of the Julian calendar 366 BC