Fort Cockhill was an 18th-century military fortification located on Cox's Hill or Tubby Hook Hill, now known as the present-day Inwood Hill Park in Manhattan, New York City. A small, circular earthwork structure, in height some ten or twelve feet and equipped with two cannon, it was situated at the northwestern extremity of Tubby Hook Hill, at a point overlooking both the Hudson River and the Harlem River valley. “the fort on Cox’s Hill was in bad repair and but little dependence placed on it. There is neither ditch nor friezing, and the northeast corner appears quite easy of access.”