31 Squadron

31 Squadron or 31st Squadron may refer to:


 * No. 31 Squadron RAAF, a unit of the Australian Royal Air Force
 * 31st Squadron (Belgium), a unit of the Belgian Air Force
 * No. 31 Squadron RAF, a unit of the United Kingdom Royal Air Force
 * 31st Rescue Squadron (United States), a unit of the United States Air Force
 * 31st Strategic Reconnaissance Squadron (United States), a unit of the United States Air Force
 * 31st Test and Evaluation Squadron (United States), a unit of the United States Air Force
 * VFA-31 (Strike Fighter Squadron 31), a unit of the United States Navy
 * Marine Aviation Logistics Squadron 31, a unit of the United States Marine Corps