Fithian is a surname. Notable people with the surname include:
David Fithian (born 1964), president of Clark University Floyd Fithian (1928–2003), American educator and politician George W. Fithian (1854–1921), American politician Lisa Fithian, American political activist Philip Vickers Fithian (1747–1776), American diarist William Fithian (1799–1890), American physician and politician
See also Fithian, Illinois, village in Oakwood Township, Vermilion County Fithian House, historic house in Danville, Illinois