Demetz is a surname. Notable people with the surname include:André Demetz (1902–1977), French general Danielle De Metz, French actress Frédéric-Auguste Demetz (1796–1873), French penal reformer and jurist Georges Demetz (1865–1942), French General Giustina Demetz, Italian alpine skier Lisa Demetz, Italian ski jumper Peter Demetz, American literature scholar of Germany Vincenzo Demetz (1911–1990), Italian cross-country skier
