Glencliff is an unincorporated community within the White Mountain National Forest in the town of Warren in Grafton County, New Hampshire, United States. The village consists of fewer than one hundred residents and some forty man-made structures, including the Willing Workers Hall, the Glencliff Community Chapel, the old firefighter's garage, the Glencliff Improvement Cooperative (community water system), the post office (located in one of the dwellings) and the Glencliff Home for the Elderly (located higher up the mountain).