505th

505th may refer to:

505th Bombardment Group, inactive United States Air Force unit 505th Bombardment Squadron, part of the 319th Air Refueling Wing at Grand Forks Air Force Base, North Dakota 505th Brigade, Brigade of the Army of the Republic of Bosnia and Herzegovina 505th Command and Control Wing, organized under the USAF Warfare Center 505th Fighter Squadron or 138th Fighter Squadron, squadron of the United States Air Force 505th Infantry Regiment (United States), an airborne forces regiment of the US Army

See also 505 (number) 505, the year 505 (DV) of the Julian calendar 505 BC