Ursin a surname. Notable people with the surname include:
Georg Frederik Ursin (1797–1849), Danish mathematician and astronomer Holger Ursin (1934–2016), Norwegian physician and psychologist Rupert Ursin (born 1973), Austrian quantum physicist Nils Robert af Ursin (1854–1936), Finnish secondary school teacher and politician
See also La Chapelle-Saint-Ursin, commune in the Cher department in the Centre region of France Ursin Durand (1682–1771), French Benedictine of the Maurist Congregation and historian Ursins (disambiguation), municipality in the district of Jura-Nord Vaudois of the canton of Vaud in Switzerland