John Harrison Mills (January 11, 1842 – October 23, 1916) was an American artist, businessman and philanthropist who worked in Buffalo, New York, and in Colorado. While he considered himself to be foremost a painter, he also worked in sculpture, sketches, poetry and other writings. His primary occupation was an engraver, making illustrations for publications of the day. He was a partner in a lithography business and an engraving/publishing business, and founded a shipping company for artists.