31 (number) 31st station 31st Dáil 31st Fighter Wing 31st Punjabis 31st Operations Group 31st Rescue Squadron 31st Combat Training Squadron 31st Infantry Division (Wehrmacht) 31st Regiment 31st Division 31st Airlift Squadron 31st Canadian Parliament 31st Cavalry 31st Infantry Division (United States) 31st Engineer Battalion 31st Test and Evaluation Squadron 31st parallel 31st Marine Expeditionary Unit 31st Field Artillery Regiment 31st Battalion (Alberta), CEF 31st Battalion 31st Brigade 31st Maine Infantry Regiment 31st Illinois Infantry Regiment Judah and 31st Avenue station 31st Infantry Brigade (United Kingdom) 31st Tactical Reconnaissance Squadron 31st Air Division 3…

31st meridian 31st Group 31st Air Defense Artillery Brigade (United States) Government of the 31st Dáil 31st Reconnaissance Squadron 31st Infantry Regiment (United States) 31st October (film) 31st New York Infantry Regiment 31st Street 31st Division (Imperial Japanese Army) 31st Rocket Army 31st Army Oslo, August 31st 31st Army Corps 31st Armoured Brigade (United Kingdom) 31st Wisconsin Infantry Regiment 31st Ranger Battalion 31st Cavalry Regiment

(United States) California's 31st senatorial district 31st (Huntingdonshire) Regiment of Foot 31st MMC – Yambol 31st Guards Air Assault Brigade 31st Battalion, Royal Queensland Regiment 31st United States Congress 31st Mechanized Infantry Brigade (Greece) 31st Division (United Kingdom) 31st Ashura Division 31st Tank Regiment (Italy) 31st Airborne Brigade (Bundeswehr) 31st New Brunswick general election 31st Nova Scotia general election 31st Massachusetts Infantry Regiment 31st Legislature of Yukon 31st Iowa Infantry Regiment 31st Seoul Music Awards 31st Ohio Infantry Regiment 31st Indian Armoured Division 31st Virginia Infantry Regiment 31st Tactical Air Base 31st Japan Academy F