Cauchie is a surname. Notable people with the surname include:
Alfred Cauchie (1860–1922), Belgian professor of history (c. 1535 – c. 1600), French grammarian Idès Cauchie (born 1949), Belgian politician (1882–1963), French musicologist (1875–1952), Belgian architect, painter and decorator, designer of the Cauchie House in Brussels
See also La Cauchie, a commune in Pas-de-Calais, Hauts-de-France, France