Newton Horace Winchell (17 December 1839 – 2 May 1914) was an American geologist chiefly notable for his six-volume work The Geology of Minnesota: Final Report of the Geological and Natural History Survey of Minnesota, which was prepared by Winchell and his assistants. A bibliography of his publications by Warren Upham in the Bulletin of the Geological Society of America (volume 26, pp. 27–46) contains almost 300 titles.