500th may refer to:
500th anniversary, also known as a Quincentennial 500th (1st Wessex) Field Company, Royal Engineers 500th Air Defense Group, disbanded United States Air Force (USAF) organization 500th Air Expeditionary Group Constituted as 500th Bombardment Group 500th Bombardment Squadron, inactive United States Air Force unit 500th Brigade, also known as the Kfir (Young Lion) Formation, a regular-service tank brigade from 1972 to 2003 500th Fighter-Bomber Squadron, inactive United States Air Force unit 500th Heavy Anti-Aircraft Regiment, Royal Artillery, a Scottish air defence unit of Britain's Territorial Army 500th Military Intelligence Brigade (United States) 500th Raider Infantry Battalion 500th Simpsons episode or At Long Last Leave, the 14th episode of the 23rd season of the American animated television series 500th SS Parachute Battalion, the parachute unit of the Waffen-SS Emmerdale Village's 500th anniversary, Emmerdale being a fictional village in the Yorkshire Dales in a British soap opera
See also 500 (disambiguation)