Hartness is a surname. Notable people with the surname include:
Ann Hartness (born 1936), American academic research librarian Don Hartness (fl. 2020s), American politician from Mississippi Helen Hartness Flanders (1890–1972), American ballad collector Henry Hartness, English footballer James Hartness (1861–1934), American inventor, entrepreneur, and governor of Vermont Minnie Hartness (1867-1957), American stenographer, writer, lecturer
See also Hartness State Airport, public airport near Springfield, Vermont