Factory Hill el. 9,527 feet (2,904 m) is a mountain peak in the Red Mountains of Yellowstone National Park. It is directly north of Mount Sheridan and west of the Heart Lake Geyser Basin. Early in the history of Yellowstone, this peak was call Red Mountain by the Hayden surveys, a name later transferred to the range in which it resides. In 1885, the Hague Geological Survey gave the peak its present name based on the following passage by Nathaniel P. Langford in his 1871 Scribner's account of the Washburn–Langford–Doane Expedition. Langford's party was camped near the south arm of Yellowstone Lake at the time.