512th

512th may refer to:


 * 512th Airlift Wing, an associate C-5 Galaxy Air Force Reserve unit located at Dover AFB, Delaware
 * 512th Fighter Squadron, inactive United States Air Force unit
 * 512th Operations Group, the operational flying component of the 512th Airlift Wing, assigned to the United States Air Force Reserve
 * 512th Rescue Squadron (512 RQS), part of the 58th Special Operations Wing based at Kirtland Air Force Base, New Mexico
 * 512th Heavy Panzerjäger Battalion, a German Army unit in World War II