Jost Winteler (21 November 1846 - 23 February 1929) was a Swiss professor of Greek and history at the Kantonsschule Aarau (today called the Old Cantonal School Aarau), a linguist, a “noted” philologist, an ornithologist, a journalist, and a published poet. He served as both a mentor and father figure to a teenage Albert Einstein, who boarded at his home from October 1895 to October 1896, while he attended his final year of secondary school.