337th

337th may refer to:


 * 337th Aeronautical Systems Group, inactive United States Air Force unit
 * 337th Air Control Squadron, part of the 33d Fighter Wing, an AETC unit, based at the USAF Tyndall Air Force Base, Florida
 * 337th Airlift Squadron, part of the 439th Airlift Wing at Westover Air Reserve Base, Massachusetts
 * 337th Brigade, Royal Field Artillery, part-time unit of the British Army's Royal Artillery from 1860 to 1956
 * 337th Flight Test Squadron, most recently part of the 46th Test Wing and based at McClellan Air Force Base, California
 * 337th Independent Helicopter Regiment, based in Tolmachevo Airport in the town of Ob, Siberia
 * 337th Infantry Division (Wehrmacht), German Army infantry division in World War II
 * 337th Infantry Regiment (United States), National Army Infantry Regiment first organized for service in World War I
 * 337th Rifle Division (Soviet Union), first formed in August 1941, as a standard Red Army rifle division, at Astrakhan
 * 337th Test and Evaluation Squadron, squadron of the United States Air Force
 * 337th Volksgrenadier Division (Wehrmacht), German military unit during World War II