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
See also 512 (number) 512 (disambiguation) 512, the year 512 (DXII) of the Julian calendar 512 BC